Method for removal of nitrogen oxides from exhaust gas

Details Method for removal of nitrogen oxides from exhaust gas Method for removal of nitrogen oxides from exhaust gas

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) B01J 23/58 (2006.01)

Patent

CA 2363487

The removal of nitrogen oxides from an exhaust gas is accomplished by a method which comprises causing the exhaust gas in an oxidizing atmosphere to contact a catalyst comprising a refractory inorganic oxide and catalytically active components, the components comprising 0.1 to 30 g per liter of the catalyst of at least one noble metal selected from the group consisting of Pt, Pd, Rh, and Ru or a compound of the noble metal and 1 to 80 g per liter of the catalyst of at least one metal selected from the group consisting of Li, K, Na, Rb, Ce, Be, Mg, Ca, St, and Ba or a compound of the metal, thereby inducing the catalyst to adsorb thereon the nitrogen oxides in the exhaust gas and, subsequently introducing a reducing substance intermittently into the exhaust gas thereby purifying the exhaust gas by reducing the nitrogen oxides adsorbed on the catalyst.

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