Abstract: The present invention provides a catalyst for purification of industrial and automotive vehicle exhaust gas. The said catalyst comprises, as active ingredient(s), oxide(s) of copper, nickel, cobalt, zinc, chromium, manganese, iron and neodymium or complex oxides thereof. The present catalyst can be used to remove carbon monoxide, hydrocarbons (HC), nitrogen oxides (NO.sub.x) simultaneously from exhaust gas, and it is also applicable to removing sulfur oxides and lead from exhaust gas. The present catalyst which can be started at low temperatures has advantages including high single-pass conversions and that there is no need to install oxygen sensors and heaters in the exhaust tubes of vehicles when the catalyst is used.