CATALYST AND METHOD FOR SIMULTANEOUSLY CONVERTING CARBON MONOXIDE, HYDROCARBON AND NITROGEN OXIDE FROM EXHAUST GAS FROM INTERNAL COMBUSTION ENGINE

PURPOSE: To efficiently remove CO, CH and NOx in automobile exhaust gas by impregnating an inert carrier with Pd and Rh salt aqueous liquids with a specific weight ratio expressed in terms of Pd, Rh, drying and forming the catalyst. CONSTITUTION: An inert carrier consisting of a honeycombed Al oxide incorporating 5-20 wt.% CeO2 is impregnated with Pd and Rh salts, then heat-treated at temperatures of 300-950 deg.C in the air to obtain the catalyst enabling to simultaneously convert CO, CH and NOx in the exhaust gas of an internal combustion engine. Depositing quantities of Pd and Rh on this catalyst is 0.03-3 wt.% and a weight ratio of Pd to Rh is (1:1) to (20:1). The Al oxide up to 20 wt.% can be replaced with Zr dioxide, La oxide, Nd oxide, Pr oxide and Ni oxide, etc., as a single compound or a mixture.