Exhaust gas purifying catalyst and an exhaust gas purifying method using the catalyst

摘要

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 DEG to 800 DEG C. and under the presence of a hydrocarbon at the total THC concentration/NOx concentration of from 0.5 to 50.