| 摘要 |
A multi-catalyst system is provided which is effective for the conversion of nitrogen oxides, carbon monoxide and hydrocarbons in near stoichiometric engine exhaust gases in a single conversion zone to which no additional air is admitted. The system comprises at least two separate but contiguous components. The first component comprises a porous inert support having dispersed thereon rhodium plus nickel and/or cobalt, and is essentially free of platinum and palladium. The second component comprises a porous inert support having dispersed thereon platinum and/or palladium, with or without nickel and/or cobalt, and is essentially free of rhodium.
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