| 摘要 |
PCT No. PCT/SE96/00675 Sec. 371 Date Dec. 24, 1997 Sec. 102(e) Date Dec. 24, 1997 PCT Filed May 24, 1996 PCT Pub. No. WO97/02092 PCT Pub. Date Jan. 23, 1997A catalyzer is provided for promoting chemical reactions, such as the reaction between ammonia and air to produce nitrogen monoxide which, in turn, can be used to manufacture nitric acid or the purification of flue gas from incineration plants. The catalyzer is made by forming a mixture of a combustible pore forming substance, such as a polymer, vegetable material or graphite, and a ceramic material, such as alumina, zirconia, titanium dioxide, silica, tungsten carbides, silicon nitrides and mixtures thereof, and thermally spraying this mixture onto a support net to result in a net having porous ceramic deposited thereon. The surface area of this porous ceramic/net composition can be enlarged by depositing a high surface area ceramic, such as alumina, silica, titanium dioxide, zirconia, aluminum-titanium, silicon carbide and mixtures thereof, into the pores the ceramic/net composition by a in-situ precipitation technique; by a sol-gel technique or by injecting the high surface area ceramic into the jet spray of the ceramic material during the thermal spraying process so that both high surface area ceramic and ceramic material are deposited onto the net. Catalytically active metal components, such as palladium, platinum and oxides of iron, chromium, copper and zinc are deposited onto the resulting high surface area ceramic/net composition. |
