| 摘要 |
A process for the removal of carbon monoxide, hydrocarbons, and nitrogen oxides in an oxidizing exhaust gas comprising contacting the exhaust gas with a catalyst comprising a crystalline zeolite having the following characteristics: (a) a Si/Al atomic ratio between 5 and 100; (b) a pore size in the range of from about 0.5 to about 1.3 nm; (c) essentially no octahedral aluminum detectable by <27>Al NMR spectroscopy; (d) a sodium ion exchange capacity, with regard to total aluminum content, of greater than 75 %; (e) a copper content in the range of from about 0.5 wt.% to about 12 wt.%; and (f) a silver content in the range of from about 0.25 wt.% to about 20 wt.%.
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