Exhaust gas purifying catalyst and an exhaust gas purifying method using the catalyst
AssigneeIdemitsu Kosan Co., Ltd.
InventorsToshiaki Hayasaka, Takuma Kimura
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Abstract
The catalyst for purifying an exhaust gas has at least gallium and a zeolite and an exhaust gas purifying method using the catalyst. Nitrogen oxides in the exhaust gas are reduced and eliminated by the catalyst in an oxidative atmosphere at a reaction temperature of 200.degree. to 800.degree. C. and under the presence of a hydrocarbon at the total THC concentration/NO.sub.x concentration of from 0.5 to 50.
Claims3
An exhaust gas purifying method comprising the steps of bringing an exhaust gas into contact with a catalyst containing (1) gallium, (2) at least one ingredient selected from the group consisting of cobalt, zirconium, niobium, potassium and barium and (3) a zeolite, in the presence of a hydrocarbon in an oxidative gas, thereby reducing and eliminating nitrogen oxides in said exhaust gas.
Dependencies are inferred from the claim text.