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publicationNumber US-4188364-A
titleOfInvention Two-stage catalysis of engine exhaust
abstract The invention relates to reduction of nitric oxide in exhausts from hydrocarbon burning engines. The nitric oxide is reacted with ammonia over a first catalyst and then the excess ammonia is reacted with oxygen present in the exhaust gas over a second catalyst. The resulting effluent stream has greatly reduced nitric oxide content without having an objectionable content.
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