Abstract: A catalytic converter for purifying gases from a combustion engine using a catalyst comprising tourmaline is connected to a position more than 1 meter far from the exhaust manifold in an exhaust passage ranging from the exhaust manifold to the tail pipe. Coated on a monolithic carrier, the catalyst is prepared comprising tourmaline of 80˜90 wt. % of said catalyst, or said tourmaline with platinum, palladium or rhodium of 0.1˜0.5 grams per liter of said carrier. The catalyst comprising tourmaline, or said tourmaline with platinum, palladium or rhodium, or said tourmaline with the platinum, palladium and rhodium mixture is adjusted to amount to 10˜30 wt. % of said carrier.