Catalyst and method for purifying exhaust gases

Details Catalyst and method for purifying exhaust gases Catalyst and method for purifying exhaust gases

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) F01N 3/20 (2006.01)

Patent

CA 2159956

The present invention provides a two-step catalyst system for purifying exhaust gases containing reductive component comprising hydrocarbon, nitrogen oxides and excess amount of oxygen than the stoichiometrical amount to perfectly oxidize all the reduction component, said catalyst system comprises placing a hydrocarbon oxidization catalyst having high perfect oxidation activity of hydrocarbon at the first zone in the flow of the exhaust gases, and placing a NOx decomposition catalyst to decompose nitrogen oxides to nitrogens and oxygens at the second zone downstream in the exhaust gases flow path.

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