Exhaust gas purifying catalyst.

摘要

An exhaust gas purification catalyst of high resistance which allows highly effective purification of nitric oxide into nontoxic gas even for the exhaust gas containing oxygen at a high concentration. A carrier of the catalyst includes crystalline pentasil-type aluminosilicate supports copper and phosphori, the amount of the phosphori being supported ranges from 0.01% to 6.0% by weight as a conversion to P2O5, and ratio of the phosphorus to the copper, i.e., P/Cu (molar ratio) is in 0 < (P/Cu) </= 0.7. A method of reducing and eliminating a nitrogen oxide in an exhaust gas in the presence of a hydrocarbon having a ratio of an overall THC concentration/NOx concentration of 0.5 - 50 at a reaction temperature of 200 - 800 DEG C in an oxidative atmosphere.