| 摘要 |
A catalytic element includes a catalyst body with a catalytic surface and a restrictor layer disposed on the catalyst body for inhibiting diffusion of reaction gases. The catalyst body recombines hydrogen with oxygen and/or carbon monoxide with oxygen. The restrictor layer is porous, is disposed on the catalytic surface, and has a layer thickness varying in the direction of flow of the reaction gasses. The restrictor layer also can have a varying pore diameter that varies in the direction of flow of the reaction gasses. The restrictor layer can be ceramic and include aluminum oxide or silicon oxide, include minerals, be formed from a mineral bed, be metallic, be a metal foil, or include metallic or ceramic fibers forming a mesh.
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