Patent ID: 8399373

Claim:
Porous composite material that comprises a porous substrate based on a refractory inorganic oxide that is selected from among alpha-alumina, theta-alumina, cordierite, magnesium oxide, zirconia, titanium oxide or mixtures of these oxides, whereby said substrate has a mean diameter of the pores of between 20 nm and 750 nm, in which said substrate has a zeolite crystal content that is less than 15% by mass, whereby said crystals are dispersed homogeneously in the pores of said substrate, whereby the distribution coefficient of the framework elements X and Y of the zeolite, where X represents silicon and/or germanium and Y represents at least one element that is selected from among aluminum, iron, gallium, and boron, measured by Castaing microprobe, is between 0.75 and 1.25, and in which the total pore volume of said final composite material represents at least 40% of the initial total pore volume of the substrate, and the mean diameter of the pores of said composite material represents at least 50% of the mean diameter of the pores of the initial substrate.