초록 ▼

The invention provides a catalyst for catalytic reduction of nitrogen oxides which uses a hydrocarbon or an oxygen-containing organic compound as a reducing agent, which comprises silver aluminate supported on a solid acid carrier material. The invention also provides a catalyst which comprises silv

The invention provides a catalyst for catalytic reduction of nitrogen oxides which uses a hydrocarbon or an oxygen-containing organic compound as a reducing agent, which comprises silver aluminate supported on a solid acid carrier material. The invention also provides a catalyst which comprises silver aluminate and at least one transition element selected from the group consisting of W, Mo and V, each supported on a solid acid carrier material. The invention further provides a method for producing such catalysts and a method for catalytic reduction of nitrogen oxides by use of such catalysts as above mentioned.

대표청구항 ▼

[ What is claimed is:] [1.] A method for catalytic reduction of nitrogen oxides contained in exhaust gases which comprises contacting the exhaust gas with a catalyst under conditions effective for the reduction of nitrogen oxides, which comprises silver aluminate supported on alumina, wherein the ca

[ What is claimed is:] [1.] A method for catalytic reduction of nitrogen oxides contained in exhaust gases which comprises contacting the exhaust gas with a catalyst under conditions effective for the reduction of nitrogen oxides, which comprises silver aluminate supported on alumina, wherein the catalyst is produced by supporting at least one member selected from the group consisting of silver, silver halides, silver nitrate, silver hydroxide and silver oxide on alumina, and then calcining the resultant product in an oxidative atmosphere in the presence of 3-20% by weight of water vapor at a temperature of 600-900.degree. C. to form silver aluminate on the alumina, wherein the silver aluminate is supported in an amount of 0.01-10% by weight based on the catalyst.