An exhaust gas purifying catalyst, for reducing nitrogen oxides and ammonia in an exhaust gas of an internal combustion engine, in an oxidizing atmosphere, is provided. The exhaust gas purifying catalyst comprises a first catalyst having zeolite carrying platinum and copper thereon. Preferably, the exhaust...http://www.google.co.uk/patents/US6133185?utm_source=gb-gplus-sharePatent US6133185 - Exhaust gas purifying catalyst
