Patent ID: 6057263
Filing Date: 2000-05-02
Classification: B01J,F01N,Y02A

Abstract:
A metallic catalyst carrier comprising:a gas inlet section through which gas is introduced;a gas outlet section through which the gas is discharged; andan intermediate section located between said gas inlet section and said gas outlet section;wherein said gas inlet section includes a plurality of layers of flat metal sheet and a plurality of layers of corrugated metal sheet, each layer of the flat metal sheet and each layer of the corrugated metal sheet being alternately put one upon another so as to define a gas passage between the adjacent layers of the flat and corrugated metal sheets,wherein said gas outlet section includes a plurality of layers of flat metal sheet, and a plurality of layers of corrugated metal sheet, each layer of the flat metal sheet and each layer of the corrugated metal sheet being alternately put one upon another so as to define a gas passage between the adjacent layers of the flat and corrugated metal sheets, the layers of the flat and corrugated metal sheets in said gas outlet section being larger in number than those in said gas inlet section,wherein said intermediate section includes only a plurality of layers of corrugated metal sheet, the gas passage being defined between the adjacent layers of corrugated metal sheet,wherein each layer of the corrugated metal sheet in said gas inlet section has large corrugations, and each layer of the corrugated metal sheet in said gas outlet section has small corrugations which are smaller in height than each layer of the corrugated metal sheet in said gas inlet section,wherein said gas outlet section is higher in cross-sectional density of the gas passage than said gas inlet section,wherein the layers of the corrugated metal sheet in said gas outlet section include first layers of the corrugated metal sheet which layers are respectively connected to the layers of the corrugated metal sheet in said gas inlet section through the layers of the corrugated metal sheet in said intermediate section and layers of corrugated metal sheet which has large corrugations and small corrugations which are identical respectively with the large corrugations in said gas inlet section and the small corrugations in said gas outlet section so that said metallic catalyst carrier takes a monolithic structure, and second layers of the corrugated metal sheet which layers are spaced from the layers of the corrugated metal sheet in said gas inlet section,wherein each second layer of the corrugated metal sheet in said gas outlet section is smaller in sheet thickness than each layer of the corrugated metal sheet in said gas inlet section.