Patent Publication Number: US-2010119421-A1

Title: Catalyst support, method of manufacturing the same, and reformer having the same

Description:
BACKGROUND 
     1. Field 
     Embodiments relate to a catalyst support, a method of manufacturing the same, and a reformer having the same. 
     2. Description of the Related Art 
     A fuel cell may be implemented in a power generation system that produces power using hydrogen gas. The fuel cell may be efficient, may not produce pollutants such as nitrogen oxides, sulfur oxides, particulates, etc., and, as such, may be environmentally friendly. Hydrogen gas may be generated through a decomposition reaction, a reforming reaction, etc. Hydrogen gas may be generated from a fuel such as hydrocarbon, e.g., methane gas, propane gas, gasoline, an alcohol such as methanol or ethanol, an ether such as dimethyl ether, etc. A reformer may be used as an apparatus to generate high purity hydrogen gas from a hydrocarbon. The reformer may operate using, e.g., steam reforming, partial oxidation reforming, autothermal reforming, etc. Reforming reactions may be facilitated by a catalyst. The catalyst may be impregnated in, or coated on, a support. Both the catalyst and the support may have maximum temperatures beyond which chemical and/or physical degradation may occur. 
     SUMMARY 
     Embodiments are directed to a catalyst support, a method of manufacturing the same, and a reformer having the same, which substantially overcome one or more of the problems due to the limitations and disadvantages of the related art. 
     It is therefore a feature of an embodiment to provide a catalyst support configured to reduce hot spots, a method of manufacturing the same, and a reformer having the same. 
     It is therefore another feature of an embodiment to provide a catalyst support having a long life time, a method of manufacturing the same, and a reformer having the same. 
     At least one of the above and other features and advantages may be realized by providing a catalyst support, including a base member, and a plurality of paths extending through the base member in a first direction from a first end of the base member to a second end of the base member. Each path has a first end at the first end of the base member and a second end at the second end of the base member, and the first ends of the paths may be disposed at different intervals from a plane that is perpendicular to the first direction. 
     The first end of the base member may be an inlet and the second end of the base member may be an outlet. 
     A first set of paths may have first ends disposed at a first interval from the plane, a second set of paths may have first ends disposed at a second interval from the plane, and the second interval may be different from the first interval, such that the first ends of the second set of paths are offset from the first ends of the first set of paths. 
     The base member may have an outer periphery and a center, and the second set of paths may be disposed closer to the outer periphery than the first set of paths. 
     The catalyst support may be symmetric when rotated about a central axis, the central axis being parallel to the first direction. 
     The catalyst support may be asymmetric when rotated about a central axis, the central axis being parallel to the first direction. 
     The first ends of the paths may be tilted from a peripheral edge of the base member to an opposite peripheral edge of the base member based on a cross-section of the base member that is parallel to the plane. 
     The first end portions of the paths may be arranged to form a ripple shape that extends in a direction parallel with an extending direction of the plane. 
     A maximum value of the intervals from the plane may increase in correspondence with a cell density of the paths. 
     The base member may include a first base member having a sheet shape and a second base member having a ripple shape and being in contact with one surface of the first base member, the first base member and the second base member may overlap and may be wound in a spiral structure, and the paths may be formed between the first base member and the second base member, sidewalls of the paths being at least partially defined by the ripple shape of the second base member. 
     A path at a central portion of the spiral structure formed by the first base member and second base member may have the largest interval from the plane. 
     The first end portions of the paths may be arranged in a spiral tower shape, and the first ends of the paths may be arranged in a plurality of steps from a peripheral edge of the spiral structure to the central portion of the spiral structure based on a cross-section of the spiral structure that is parallel to the first direction. 
     At least one of the first base member and the second base member may be formed of a thermally conductive material or a metallic material. 
     The base member may be formed of a ceramic material having a plurality of penetration holes, the plurality of paths being defined by the plurality of penetration holes. 
     The catalyst support may further include catalyst materials disposed in each of the paths. 
     At least one of the above and other features and advantages may also be realized by providing a method of manufacturing a catalyst support, the method including providing a first base member having a sheet shape, providing a second base member having a ripple shape, forming a spiral structure by overlapping and spirally winding the first base member and the second base member, and offsetting a central portion of the spiral structure by a predetermined interval in a direction parallel to a winding axis of the spiral structure so that a central portion of the spiral structure projects relative to a peripheral edge portion of the spiral structure or is recessed relative to the peripheral edge portion of the spiral structure. 
     The method may further include fixing the first base member to the second base member. 
     At least one of the first base member and the second base member may be formed of a thermally conductive material or a metallic material. 
     The method may further include coating a catalyst material on a plurality of paths formed between the first base member and the second base member, where sidewalls of the paths are at least partially defined by the ripple shape of the second base member. 
     At least one of the above and other features and advantages may also be realized by providing a reformer, including a first chamber for a target reaction, and a first catalyst support disposed in the first chamber. The first catalyst support may include a base member, and a plurality of paths extending through the base member in a first direction from a first end of the base member to a second end of the base member. Each path has a first end at the first end of the base member and a second end at the second end of the base member, and the first ends of the paths may be disposed at different intervals from a plane that is perpendicular to the first direction. 
     The target reaction may include at least one of a catalyst-promoted reforming reaction and a catalyst-promoted oxidation reaction. 
     The reformer may further include a second chamber surrounding the first chamber, and a second catalyst support disposed in the second chamber. 
     The first chamber may have a first spiral structure, and the second chamber may have a second spiral structure, the second spiral structure encircling the first spiral structure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other features and advantages will become more apparent to those of ordinary skill in the art by describing in detail example embodiments with reference to the attached drawings, in which: 
         FIG. 1  illustrates a catalyst support according to a first embodiment; 
         FIG. 2A  illustrates a cross-sectional view of the catalyst support of  FIG. 1  taken along line I-I of  FIG. 1 ; 
         FIG. 2B  illustrates a cross-sectional view of the catalyst support of  FIG. 1  taken along line II-II of  FIG. 1 ; 
         FIGS. 3A and 3B  illustrate perspective views explaining a method of manufacturing the catalyst support of  FIG. 1 ; 
         FIGS. 4A and 4B  illustrate perspective views explaining a method of manufacturing a catalyst support according to a second embodiment; 
         FIG. 5A-5C  illustrate cross-sectional views of a reformer according to a third embodiment; 
         FIGS. 6A-6B  illustrate cross-sectional views of a reformer according to a fourth embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Korean Patent Application No. 10-2008-0111508, filed on Nov. 11, 2008, in the Korean Intellectual Property Office, and entitled: “Monolith Catalyst Support and Manufacturing Method Thereof and Reformer Having the Monolith Catalyst Support” is incorporated by reference herein in its entirety. 
     Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. 
     In the drawing figures, the dimensions of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when a layer or element is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. Further, it will be understood that when a layer is referred to as being “under” another layer, it can be directly under, and one or more intervening layers may also be present. In addition, it will also be understood that when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. Like reference numerals refer to like elements throughout. 
     Herein, a catalyst support according to an embodiment may be a device that supports a catalyst. Catalyst materials may be coated on the support or impregnated in the support. In an implementation, the material forming the catalyst support may be made of or include the catalyst materials, etc. The catalyst support may be a base member having a plurality of paths on which catalyst materials can be coated. Also, the catalyst support may be a catalyst carrier where a metal-support forms a catalyst. For example, the catalyst support may include the catalyst directly impregnated by oxidizing and/or reducing the base member having a plurality of paths. The catalyst for which the catalyst support provides support may be a catalyst used to perform, e.g., a reforming reaction in a reforming reactor, an oxidation reaction in an oxidation reactor, etc. 
       FIG. 1  illustrates a catalyst support according to a first embodiment. 
     Referring to  FIG. 1 , the catalyst support  10  may have a high specific surface area in order to facilitate contact between catalysts, e.g., solid catalysts, and reaction gas. The catalyst support  10  may optimize the function of the catalysts by increasing the surface areas of the catalysts. 
     The catalyst support  10  may include a base member  11  and a plurality of paths  13  penetrating the base member  11 , i.e., extending through the base member  11  so as to allow a fluid, e.g., a gas, to flow therethrough. The paths  13  may extend in a first direction (Z direction). The base member  11  may have an outer shape that is, e.g., cylindrical. The base member  11  may have a predetermined length in the first direction and may include a first end surface  11   a  at an inlet-end thereof that exposes first end portions of the paths  13 . The catalyst support  10  may include a second surface  11   b  at an outlet end thereof, the second surface  11   b  exposing second end portions of the paths  13 . The catalyst support  10  may have the first end portions of the paths  13  positioned on the first surface  11   a , the first end portions of the paths  13  being disposed to have different intervals from a virtual plane (X-Y plane) that is perpendicular to the first direction. 
     Each path  13  of the catalyst support  10  may be coated with catalysts, so that the catalyst support  10  may be used as a catalyst reactor for, e.g., an oxidation reaction or a reforming reaction, etc. A catalyst-promoted reaction may be most active at the first end (inlet side) of each path  13  because fluid (gas, liquid) may first encounter the catalyst at the first end as it enters the catalyst support  10  from the inlet end surface  11   a.    
     According to an embodiment, hot spots, which may occur if heat from the catalyst-promoted reaction is highly localized, may be reduced or eliminated. In this regard, hot spots may occur in a reactor when an oxidation reaction or a reforming reaction is performed. Such hot spots may be generated when a catalyst-promoted reaction is concentrated in a specific region, and the temperature of the part where the hot spots are generated may be considerably higher than the temperature of other parts. If hot spots having an abnormally high temperature are generated, the hot spots may cause deactivation of the catalysts positioned on the region where the hot spots are generated, and regions adjacent thereto. In particular, if relatively large hot spots are formed in a specific region of the reactor at the time of the reaction, e.g., an oxidation reaction, a reforming reaction of methane, etc., a reaction temperature of about 800° C. or more may result. Such temperatures may cause the support where the catalyst is impregnated to deteriorate, and/or cause the catalyst to be deactivated. Thus, if large hot spots are generated, a metal catalyst may be degraded, the durability of the support may deteriorate, and the life span of the support and/or reactor may be significantly shortened. If a catalyst-promoted reaction is performed at a relatively high temperature, e.g., about 600° C. or more, on a support having a planar inlet, large hot spots may be formed in a specific region, e.g., an inlet part of a path into which fuel flows. The large hot spots generate various mechanical stresses, such that it may cause a catalyst deactivation and may deteriorate durability of the device. 
     The catalyst support according to the first embodiment may have a design in which inflow points of fluids that flow into each path  13  are different. Thus, the catalyst-promoted reaction in each path  13  may not be concentrated in a same region but may, instead, be dispersed. In an implementation, the first end portions of the plurality of paths  13  have different intervals from the X-Y plane, such that the catalyst-promoted reaction of fuel in the plurality of paths  13  is performed at dispersed locations. Therefore, the catalyst support according to the first embodiment may prevent the formation of large hot spots resulting from the relatively high temperature catalyst reaction, thereby reducing or preventing catalyst deactivation and deterioration of the durability of the device. Thus, the catalyst support  10  according to the first embodiment may maintain stable operation and performance of the device even in the relatively high temperature catalyst reaction. 
       FIG. 2A  illustrates a cross-sectional view of the catalyst support of  FIG. 1  taken along line I-I of  FIG. 1 . 
     Referring to  FIG. 2A , the catalyst support according to the first embodiment may include paths  13  that may have, e.g., a round cross-section in the X-Y plane, a square cross-section in the X-Y plane, a hexagonal cross-section in the X-Y plane, etc. The paths  13  may form a honeycomb pattern in a base member  11 . The base member  11  may be, e.g., metal or ceramic. The base member  11  may be a monolithic structure, i.e., may be formed as a unitary structure, e.g., by casting, extruding, molding, etc. The base member  11  may have, e.g., a generally cylindrical shape with a circular cross-section, i.e., the outer periphery may form a circle. In other implementation, the base member  11  may have, e.g., various cross-sectional shapes such as a triangle, a rectangle, an oval, a polygon, etc. 
     The cell density of the paths  13  may be determined based on the particular application and may be configured to have a proper cell density. For example, the number of paths  13  and/or the cross-sectional area of each path  13  may be determined according to, e.g., a desired gas hourly space velocity (GHSV), a desired internal pressure, etc. The GHSV may represent a flow volume of reactants for a unit volume of the reactor, or a flow volume of reactants for a unit volume of the reactor catalyst. In each path  13 , the cross-section (X-Y plane) of the upstream end into which fluid flows may be formed identically or differently from the downstream end from which the fluid is discharged, e.g., according to a desired condition such as GHSV, internal pressure, etc. 
       FIG. 2B  illustrates a cross-sectional view of the catalyst support of  FIG. 1  taken along line II-II of  FIG. 1 . 
     Referring to  FIG. 2B , in the catalyst support  10  according to the first embodiment, the first end portions of the paths  13  may be disposed to have different intervals from a virtual X-Y plane that is perpendicular to the Z direction. For example, from an X-Y plane positioned on line L 0  in  FIG. 2B  (hereinafter, L 0  is referred to as a reference plane), the first end of a first path C 1  may be positioned in the central portion of a first surface  11   a  of the base member  11  and is spaced apart in the Z direction from the reference plane L 0  by a first length L 1 . The first end of a second path C 2  may be spaced apart from the reference plane L 0  by a second length L 2  different from L 1 . A first end of a third path C 3  positioned on the outer edge of the first surface  11   a , i.e., an outermost path, may be spaced apart from the reference plane L 0  by a third length L 3  different from L 1  and L 2 . The first length L 1  may be larger than the second length L 2 , and the second length L 2  may be larger than the third length L 3 . It will be appreciated that references herein to the reference plane L 0  and lengths L 1 , L 2 , and L 3  are merely for the sake of description. The intervals may also be described in terms of, e.g., a second reference plane L 0 ′ located at the tip of the catalyst support  10 . In such a case, the first end of the first path C 1  may be spaced apart in the Z direction from the second reference plane L 0 ′ by a first length L 1 ′. The first end of the second path C 2  may be spaced apart from the second reference plane L 0 ′ by a second length L 2 ′ different from L 1 ′. The first end of the third path C 3  positioned on the outer edge of the first surface  11   a  may be spaced apart from the second reference plane L 0 ′ by a third length L 3 ′ different from L 1 ′ and L 2 ′. 
     The catalyst support  10  may have a generally convex inlet end, i.e., the first surface  11   a  of the base member  11  may be convex. The first surface may be symmetrical with respect to the Z axis, i.e., may be symmetrical with respect to a central axis of the base member  11 . Preferably, a region  15   a  where the catalyst reaction most actively occurs in the first path C 1  is designed so that it does not completely overlap with an adjacent region  15   c  in the second path C 2  where the catalyst reaction most actively occurs in the second path C 2 . In an implementation, an extent R 1  of the region  15   a  in the first path C 1  may not overlap an extent R 2  of a region  15   b  in the third path C 3 , such that heat generated in the most active region of the first path C 1  is displaced in the Z-direction relative to heat generated in the most active region of the third path C 3 . In an implementation, the region  15   a  may partially overlap the region  15   c . The most active catalyst reaction regions in the respective paths  13  may thus be dispersed in the Z direction to reduce or eliminate hot spots. The catalyst support may be configured such that the regions  15   a  and  15   b  overlap somewhat in the Z direction, although the dispersion of the reaction heat may be reduced to a corresponding extent. Similarly, the interval between the regions  15   a  and  15   b  may be increased in the Z direction. In such a case, a projecting portion of the first end of the base member  11  may become thinner as the interval is increased, such that the mechanical strength may be reduced and/or processing time may be lengthened. It will be appreciated that overlap of regions  15   a ,  15   b , and  15   c , may be partial, or no overlap may exist, or a mixture of overlapping and non-overlapping regions may be provided. 
     Where the cross-sections of each of the plurality of paths  13  have the same area, as the cross-sections of the path  13  become smaller, the length in the Z direction of the region over which the catalyst reaction most actively occurs in the respective paths  13  may be lengthened. Thus, in an implementation, the catalyst support  10  may be designed to have a larger extent that the central portion is projected, i.e., the first surface  11   a  of the base member  11  may project more, as the average cross-section of the plurality of paths  13  is reduced, that is, as the cell density increases. 
       FIGS. 3A and 3B  illustrate perspective views explaining a method of manufacturing the catalyst support of  FIG. 1 . 
     Referring to  FIG. 3A , according to an embodiment, a base member  11 R may be prepared to have a cylindrical shape. The base member  11 R may be, e.g., a metal or ceramic monolith. The base member  11 R may have a flat first surface  11 Ra and second surface  11 Rb, one at each end in a longitudinal direction. The second surface  11 Rb may be flat or another shape. 
     Referring to  FIG. 3B , a plurality of holes  13   a  may be formed in the base member  11 R. In an implementation, the holes  13   a  may be formed using an appropriate tool, e.g., a laser device or a mechanical processing device such as a drill, etc. A separate process may be used to form the plurality of holes  13   a , or the plurality of holes  13   a  may be formed simultaneously with the base member  11 R, rather than through a separate process. Thus, in another implementation, the holes  13   a  may be formed at the same time the base member  11 R is formed, e.g., using a casting operation, etc. In cross-section, the holes  13   a  may form a honeycomb shape. 
     Referring to dashed line  11 Rc in  FIG. 3B , the first surface  11 Ra of the base member  11 R may be processed, e.g., by being ground or cut away, to up to the dashed line  11 Rc so as to shape the base member  11 R. In an implementation, the central portion on the first surface  11 Ra may be formed to have a convex shape in which the central portion projects relative to the periphery. Thus, a support having the configuration of catalyst support  10  in  FIG. 1  may be obtained. The second surface  11 Rb may be flat, may be processed to have a same shape as the first surface  11 Ra, or may be processed to have a different shape. 
       FIGS. 4A and 4B  illustrate perspective views explaining a method of manufacturing a catalyst support according to a second embodiment. 
     Referring to  FIG. 4A , the catalyst support according to the second embodiment may be formed by joining a first base member  31   a  and a second base member  31   b  together. In an implementation, the first base member  31   a  and/or the second base member  31   b  may be creased or folded to have a wave-like (serpentine) form, e.g., as shown for the second base member  31   b  in  FIG. 4A . The wave-like form may thus form a plurality of adjacent but distinct flow paths that extend in the Z direction through the catalyst support. 
     The first base member  31   a  and the second base member  31   b  may be rolled together so they overlap, thus forming a spiral when viewed from one end. A central portion  32  may be left open, or may be substantially occupied by the wound first and second base members  31   a ,  31   b.    
     The first base member  31   a  and/or the second base member  31   b  may include, e.g., a thermally conductive or metallic material. If the thermally conductive or metallic material is used, heat produced by the catalyst reaction may be efficiently transferred to the outside, and/or heat required in a catalyst-promoted reaction in the catalyst support may be easily obtained from an external heat source. In another implementation, the first base member  31   a  and/or the second base member  31   b  may include, or may be formed from, an insulating material. 
     In an implementation, a third base member  31   c , e.g., formed as another sheet, may also be included. For example, the third base member  31   c  may be installed to interpose between the second base member  31   b  and the facing surface of the first base member  31   a  when the base members are wound. The third base member  31   c  may be, e.g., thermally conductive or insulating, and various modifications can be made according to the specific requirements of the structure. 
     Referring to  FIG. 4B , the central portion  32  or central axis of the spiral structure may be pulled in the inlet direction ‘F’ so that the central axis is extended in the Z direction by a predetermined length, relative to the periphery. In  FIG. 4B , the arrow for direction ‘F’ points opposite to the fluid flow in the case that first end portions  33  are first to receive the fluid. In another implementation, hot spots may be avoided by using the concave surface at the bottom of the spiral as an inlet, such that outermost regions of the support are heated at the bottom-most portion of the support, and inner-most regions of the support are heated at a location that is longitudinally inset from the bottom-most portion by a predetermined amount. 
     The spiral structure may have a spiral tower shape in perspective view, or, in an X-Z or Y-Z cross-section, a stair shape that it is heightened by a series of stairs each having a predetermined height from the edge thereof. As shown in  FIG. 4B , first end portions  33  of the plurality of paths formed by the first and second base members  31   a ,  31   b , may form a plurality of step portions. The first end portions  33  may step sequentially upward in the Z direction, i.e., in the ‘F’ arrow direction, with each step projecting relative to an outwardly-adjacent step, thus forming a stair case in cross-section from the edge of the side surface to the central portion of the catalyst support. 
     In further detail, a first step portion  34   a  may be formed between a first step and a second step, and the second step may be projected in the Z direction at a predetermined height, relative to the first step, corresponding to the first step portion  34   a . Similarly, a second step portion  34   b  may be formed between the second step and a third step, and the third step may be projected in the Z direction at a predetermined height, relative to the second step, corresponding to the second step portion  34   b . Further, a third step portion  34   c  may be formed between the third step and a fourth step, and the fourth step may be projected in the Z direction at a predetermined height, relative to the third step, corresponding to the third step portion  34   c.    
     In an implementation, the first base member  31   a  may be fixed to the second base member  31   b . The first and second base members  31   a ,  31   b  may be fixed together using, e.g., a brazing method in the case that the first and second base members  31   a ,  31   b  are each metallic. When the metallic third base member  31   c  is used, the third base member  31   c  may also be coupled to the second base member  31   b  using the brazing method. 
     A catalyst may be coated in the plurality of paths  33  between the first base member  31   a  and the second base member  31   b . The catalyst may be separately applied before or after the first and second base members  31   a ,  31   b  are joined, or may be integral with the first and/or second base members  31   a ,  31   b . The catalyst may be selected according to a target reaction. For example, in the case of a thermal oxidation reaction, at least one of PdAl 2 O 3 , NiO, CuO, CeO 2 , Al 2 O 3 , Rh, Pd, and Pt may be used as the catalyst. In an implementation, the catalyst may have a pellet shape, etc., and may be filled in the flow paths defined by the first and second base members  31   a ,  31   b.    
     The density of the plurality of paths  33  between the first base member  31   a  and the second base member  31   b , that is, the cell density of the catalyst support, is preferably about 200 cells per inch-square (cpi) to about 1,500 cpi. 
     As described above, first end portions  33  positioned adjacent to the central portion  32  may project, relative to a plane oriented perpendicular to the Z direction, to form a convex or circular arc shape in cross-section, or a spiral tower shape in perspective view. In another implementation, the first end portions  33  positioned in the central portion  32  may be pressed downward relative to the periphery, i.e., pressed in a −Z direction, so that they may have a concave circular arc shape or an inwardly-formed spiral tower shape, i.e., so as to be plane-symmetric to the shape shown in  FIG. 4B . 
     Also, the first end portions  33  of the plurality of paths may each have a step shape, or may be tilted at an angle, i.e., to form a cone, etc. In another implementation, a wedge may be formed, e.g., by grinding or sawing the form shown in  FIG. 3A  along a plane angled relative to the X-Y plane. For example, a solid parallelogram shape may be formed. 
     Also, the first end portions  33  may have a ripple shape, an ‘M’ or ‘W’ shape, or an uneven shape so as to change height in the Z direction. For example, the first end portions  33  positioned in the central portion may first be pulled in the Z direction by a first length and then pushed in the −Z direction by the first length, so as to form an ‘M’ shape in which a middle part, midway between the center and the periphery, is further projected than both the center and the periphery. Such a configuration may spread heat over a greater longitudinal area so as to minimize hot spots, while reducing an overall length of the catalyst support. Such a configuration may be shorter than a cone or spiral tower, and may be particularly useful when the overall diameter of the catalyst support is relatively large. 
       FIG. 5A-5C  illustrate cross-sectional views of a reformer according to a third embodiment.  FIG. 5A  shows a partial view of the reformer including a catalyst support according to an embodiment.  FIG. 5B  illustrates the reformer of  FIG. 5A  with additional aspects shown.  FIG. 5C  illustrates a cross-sectional view of the reformer taken along line V-V of  FIG. 5B . In  FIG. 5C , catalyst materials are not shown for the convenience of explanation. 
     Referring to  FIGS. 5A-5C , the reformer  100  according to the third embodiment may include a reforming reaction part  110 , an oxidation reaction part  120 , and a preheating part  130 . The reforming reaction part  110  may contain the reaction whereby a hydrocarbon is reformed to produce hydrogen gas. The oxidation reaction part  120  may contain an oxidative and exothermic reaction of a first fuel, and may heat the reforming part  120  and/or the preheating part  130 . The preheating part may channel the hydrocarbon while heating the same to a predetermined temperature. 
     In further detail, the reforming reaction part  110  may include a support  112  having a plurality of paths  113 . Catalyst materials  114  may be coated in the respective paths  113 . The reforming part  110  may reform the hydrocarbon, e.g., methane, propane, natural gas, an alcohol, etc. to generate a reformate. The reformate may contain a large quantity of hydrogen gas, and may further contain carbon monoxide and/or carbon dioxide. A steam reforming reaction whereby the hydrocarbon is converted to hydrogen gas can be represented by the following Reaction Formula 1. 
       —CH 2 —+H 2 O→CO+2H 2   [Reaction Formula I] 
     As example catalyst materials  14  for the steam reforming reaction, Ni/Al 2 O 3 , Ru/ZrO 2 , Ru/Al 2 O 3 , and/or Ru/CeO 2 —Al 2 O 3  may be used. 
     When the reformer  100  includes a water gas shift reaction part or a selective oxidation reaction part on a downstream side of the reforming reaction part  110 , the reformer  100  may use one or more of Cu, Zn, Fe, Cr, Cr 2 O 3 /Fe 3 O 4 , Pt/CeO 2 , and Cu/ZnO/Al 2 O 3  as catalyst materials for the water gas shift reaction, or may use one or more of Ru, Rh, Pt/Al 2 O 3 , TiO 2 , ZrO 2 , and Au/Fe 2 O 3  as catalyst materials for the selective oxidation reaction. 
     The oxidation reaction part  120  may supply heat generated by the catalyst oxidation reaction to the reforming reaction part  110 . The oxidation reaction part  120  may include a base member  122  having a plurality of paths  123 . Catalyst materials  124  may be coated in the respective paths  123 . 
     The base member  122  may be formed as described above in connection with  FIGS. 1-4B . In an implementation, the base member  122  may be formed as described above in connection with  FIGS. 4A and 4B , and may include a first base member on a sheet and a creased second base member. The base member  122  may be formed to spirally surround the reforming reaction part  110 , centering on the reforming reaction part  110 . The catalyst materials  124  may include metal catalysts for a thermal oxidation reaction. 
     In an implementation, the oxidation reaction part  120  may further include sub-paths  123   a  that intermittently connect adjacent paths from among the plurality of paths  123 . The sub-paths  123   a  may allow fluids passing through the plurality of paths  123  to move freely between adjacent paths, so that the amount of contact between the fluids and the catalysts is increased, making it possible to enhance reaction efficiency. 
     As shown in  FIG. 5C , the oxidation reaction part  120  may further include a pair of connection terminals  142  and  144  that are coupled to heating elements for preheating. The pair of connection terminals  142  and  144  may be installed at one end of the central portion-side and the other end of the edge-side, respectively, and may be connected to an external power supplier. In an implementation, the first base member, the second base member, and/or the third base member may be electrically insulating, while another of the first base member, the second base member, and the third base member may have a predetermined electrical conductivity, such that a spiral electrically conductive path is formed that has a predetermined resistance. With the pair of connection terminals  142  and  144  connected to the external power supplier, the spiral oxidation reaction part  120  may thus function as a thermal load, making it possible to appropriately preheat the oxidation reaction part  120  itself or the entirety of the reformer  100 . Such a configuration may be appropriately used when the reformer  100  is first started, e.g., when the reformer  100  starts at a temperature lower than a room temperature (for example, 20° C. or below). 
     The oxidation reaction part  120  may be substantially the same as the catalyst support of  FIG. 4B , while additionally providing space for the reforming reaction part  110  positioned in the middle part of the oxidation reaction part  120 , and providing for the pair of connection terminals  142  and  144 , and the sub-paths  123   a.    
     In the oxidation reaction part  120 , one surface  122   a  of the catalyst support may be tilted towards an inlet port  121  of a first fuel, which may be consumed in an oxidative reaction to produce heat. The first fuel may be the same or different from the hydrocarbon (hereinafter, the hydrocarbon will be referred to as the second fuel, for clarity). The respective first end portions of the plurality of paths  123  positioned on the first surface  122   a , i.e., the leading or inlet surface, may be disposed so that the in-flowing first fuel most actively performs the thermal oxidation reaction at different positions, i.e., a positions disposed or offset in the Z direction sequentially from a path adjacent to the reforming reaction part  110  to a path farthest from the reforming reaction part  110 . Thus, the oxidation reaction part  120  may disperse the heat-generating regions where the thermal oxidation reaction of the first fuel is most actively performed in order to prevent large hot spots from being formed in a predetermined region of the oxidation reaction part  120 . 
     The preheating part  130  may serve to preheat a reactant fluid that is supplied to the reforming reaction part. The preheating part  130  may include a path through which the second fuel and water pass, the second fuel and water being heated by the heat generated from the oxidation reaction part  120 . The preheating part may be coupled to the reforming reaction part  110  such that all of the preheated reactant fluid exiting the preheating part is supplied to the reforming reaction part  110 . The preheating part  130  may be connected to the reforming reaction part  110  through a separate pipe. 
     The reforming reaction part  110  may have a first chamber having at least one inlet port, into which the second fuel and water flow from the preheating part  130 , and an outlet port from which a hydrogen gas-containing reformate is discharged. The oxidation reaction part  120  may have a second chamber having at least one inlet port  121 , into which the first fuel and/or air flows, and an outlet port for an exhaust of combustion by-products. 
       FIGS. 6A-6B  illustrate cross-sectional views of a reformer  200  according to a fourth embodiment.  FIG. 6A  is a schematic view of the reformer  200  with a catalyst support.  FIG. 6B  is a cross-sectional view of a reformer taken along line VI-VI of  FIG. 6A . 
     Referring to  FIGS. 6A and 6B , the reformer  200  may include a reforming reaction part  210 , an oxidation reaction part  120 , and a preheating part  130 . 
     The reforming reaction part  210  may steam-reform the second fuel, which may receive heat from the oxidation reaction part  120 , and which may be supplied through the preheating part  130 . The second fuel may include, e.g., natural gas having methane as a main component. The steam reforming reaction of methane may be performed at a temperature of, e.g., about 800° C. 
     The reforming reaction part  210  may include a base member having a plurality of paths  213  spirally surrounded and extended in a direction approximately parallel with a spiral axis direction. Reforming catalyst materials  214  may be coated on an inner surface of each path  213 . A first surface  212   a  of the base member  212 , that is, a surface at which first end portions of the plurality of paths  213  are positioned, may be tilted from a central portion  211  in a spiral structure to an edge, as shown in  FIG. 6A . 
     The respective first end portions of the plurality of paths  213  positioned on the first surface  212   a  may be disposed so that the in-flowing second fuel most actively performs the thermal oxidation reaction at different positions sequentially disposed from a path adjacent to the central portion  211  of the reforming reaction part  210  to a path adjacent to the oxidation reaction part  120 . Thus, the oxidation reaction part  210  may disperse the heated region where the thermal oxidation reaction of the second fuel is most actively performed to prevent large hot spots from being formed in a predetermined region of the oxidation reaction part  210 . 
     In an implementation, the reforming reaction part  210  may substantially corresponds to the catalyst support of  FIG. 4B , further providing for the features that the target reaction is the reforming reaction rather than the thermal oxidation reaction. In another implementation (not shown), the reforming part may be formed as described in connection with  FIGS. 1-3B . 
     As shown in  FIG. 6B , and similar to the description provided above in connection with  FIG. 4B , the oxidation reaction part  120  may be formed to spirally surround the reforming reaction part  210 , centering on the reforming reaction part  210 . Thus, a double spiral structure may be formed by overlappedly rolling a sheet-shaped base member and a creased base member on an external surface of the reforming reaction part  210 , which itself is spirally rolled and has a central portion projected in one direction. The first end  122   a  may be formed in a tilted shape by pulling edge parts in one direction. The oxidation reaction part  120  may be substantially the same as the oxidation reaction part of the reformer explained with reference to  FIG. 5B . 
     The reformer  200  may be substantially the same as the reformer  100 , except for the differences in the reforming reaction part  210 . 
     The reforming reaction part  210  may have a first chamber including at least one inlet port, into which the second fuel and water flow from the preheating part  130 , and an outlet port from which the hydrogen gas-containing reformate is discharged. Also, the oxidation reaction part  120  may have a second chamber including at least one inlet port  121  into which the first fuel and/or air flows, and an outlet port for an exhaust. 
     As described above, embodiments may prevent hot spots from being generated on the catalyst support. Therefore, the term of durability of a metal catalyst and support can be extended. Furthermore, a highly efficient and highly durable catalyst reactor may be easily and simply manufactured using the catalyst support. Further, the catalyst support may be easily manufactured in a mass production line, such that product yield may be enhanced and the manufacturing cost thereof may be reduced. 
     Some reforming reactions may be endothermic, such that heat must be supplied to the reformer in order to drive the reaction. Thus, as described herein, an oxidative reaction may be employed to supply such heat. In an implementation, the reformer in the aforementioned embodiments may further include an ignition unit for igniting the first fuel supplied to the oxidation reaction part using the catalyst oxidation method. The configuration and operation of the ignition unit used in the reformer may be of a generally-known design and thus the detailed description thereof will be omitted. 
     Example embodiments have been disclosed herein, and although specific terms are employed, they are used and are to be interpreted in a generic and descriptive sense only and not for purpose of limitation. Accordingly, it will be understood by those of ordinary skill in the art that various changes in form and details may be made without departing from the spirit and scope of the present invention as set forth in the following claims.