| 摘要 |
This invention relates to catalysts, especially for the catalytic oxidation of hydrocarbons and carbon monoxide and for the catalyst reduction of oxides of nitrogen in the presence, respectively, of suitable oxidising and reducing means. In more detail, the catalyst of the invention is capable of removing oxygen from a gas containing an excess of oxygen and restoring such removed oxygen to a gas having an oxygen deficiency, and the catalyst comprises a support carrying at least one metal selected from gold, silver, platnium, rhodium, ruthenium, palladium, iridium, and osmium, and at least one base metal selected from cobalt, manganese, nickel, zinc, tin, tungsten, cerium, iron, copper, preaseodium, rhenium, chromium, molybdenum, lanthanum, calcium, strontium, barium, zirconium, and gadolinium, at least two of the said metals in the catalyst being in the form of a perovskite, said base metal being between5 and 99.9 weight per cent of the total weight of metal in the catalyst, the support being stabilised by the inclusion therein of at least one of said base metals. |
