Method of removing nitrogen oxides from an exhaust

Details Method of removing nitrogen oxides from an exhaust Method of removing nitrogen oxides from an exhaust

B - Operations, Transporting

01

D

53/14, 23/353

B01D 53/34 (2006.01) B01D 53/86 (2006.01) B01J 8/12 (2006.01) C21B 5/00 (2006.01) C21B 13/00 (2006.01)

Patent

CA 1083327

Abstract of the Disclosure A method of removing nitrogen oxides from an exhaust which comprises the steps of contacting an exhaust containing nitrogen oxides and ammonia with a reducing catalyst received in a reactor to reduce the nitrogen oxides to nitrogen gas, wherein iron ore catalyst lumps having a particle size of 25 mm or less and forming a catalyst bed in the reactor are used as a reducing catalyst; the iron ore lumps of the catalyst bed are let to fall gravitationally through the reactor continuously or intermittently; and the iron ore catalyst lumps discharged from the reactor are either used as raw material for iron manufacture or fed back to the reactor to be reused as a reducing catalyst after being sieved.

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