Mitsui Mining Co., Ltd.

Nobuhide Ikeyama

Yutaka Iwanaga

Masatosi Adachi

Yuji Torikai

Catalyst for the decomposition of nitrogen oxides and a method for

The present invention provides a desulfurization and denitrification process by dry process, whereby a stable operation is rendered possible at a temperature of 100.degree. to 200.degree. C. with a high energy efficiency and without deterioration of a catalyst for a long time and any problem on by produced N.sub.2 O. This process comprises treating a waste gas containing SOx and NOx with catalyst-poisoning materials in an apparatus for mainly effecting desulfurization and then in an apparatus for mainly effecting denitrification, characterized by passing the waste gas through a desulfurization apparatus of moving bed type, in which a carbonaceous adsorbent is moved downward at a temperature of 100.degree. to 200.degree. C., adding ammonia to the waste gas at a temperature of 100.degree. to 200.degree. C., leaving the desulfurization apparatus, and then passing the waste gas through the low temperature denitrification apparatus, in which a catalyst of TiO.sub.2 -V.sub.2 O.sub.5 type comprising vanadium oxide supported on titanium oxide of anatase type, having a specific surface area of 100 to 250 m.sup.2 /g and micropores of 1.5 to 2.5 nm in pore diameter and 7.5 to 8.5 nm in pore diameter respectively in an amount of at least 0.05 cc/g, is filled, at a temperature of 100.degree. to 200.degree. C., thus effecting the denitrification.

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Fukuoka-ken, Japan

Nobuhide Ikeyama