Proces for selective removal of nitrogen oxides from waste gases
AssigneeSumitomo Chemical Company, Limited
InventorsTatsuo Shiraishi, Shinkichi Shimizu, Hiroshi Ichihashi, Tadashi Shindo
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Abstract
A process for the selective removal of nitrogen oxides from waste gases containing nitrogen oxides, which comprises contacting the waste gases with a metal oxide catalyst having the following formula: V.sub.x A.sub.y O.sub.z wherein V is vanadium; A is at least one element selected from the group consisting of copper, zinc, tin, lead, titanium, phosphorus, chromium, iron, cobalt and nickel; x and y are each a numeral of 0.5 to 12; and z is a numeral of 1 to 60, at a temperature of 150.degree. to 800.degree. C in the presence of ammonia.
Claims13
A process for the selective removal of nitrogen oxides from waste gases containing nitrogen oxides, which comprises contacting the waste gases with ammonia in the presence of a metal oxide catalyst for the reduction of nitrogen oxides with ammonia, said catalyst consisting essentially of a composition having the following formula
- V.sub.x A.sub.y O.sub.z
- wherein V is vanadium;
- A is at least one element selected from the group consisting of copper, zinc, tin, lead, titanium, phosphorus, chromium, iron, cobalt and nickel;
- x and y are each a numeral of 0.5 to 12;
- and z is determined by the valence requirements of the other elements in said compound.
A method for the removal of nitrogen oxides from effluent gas which comprises reducing the nitrogen oxides contained within said effluent gas with ammonia in the presence of a catalyst consisting essentially of tin oxide and vanadium oxide in an amount of 20-96 mole percent SnO.sub.2 and 4-80 mole percent V.sub.2 O.sub.5 at a temperature of 250.degree. to 450.degree. C.
Dependencies are inferred from the claim text.