Abstract: A catalytic converter for treating pollutants contained in exhaust gas from an internal combustion engine, includes a chamber having an inlet disposed at a first end of the chamber for introduction of the exhaust gas and an outlet disposed at a second end of the chamber opposite the first end for discharge of the exhaust gas from the chamber after treatment; a front plate provided at the inlet of the chamber and having defined therein a plurality of openings; first, inner, and second, outer, fixed cones positioned within the chamber, disposed in a spaced apart and parallel relationship to one another, and having a plurality of spaced apart holes defined therein, wherein the plurality of holes defined in the first fixed cone are disposed in a staggered relationship to the plurality of holes of the second fixed cone, and wherein the first fixed cone defines with the front plate a first zone within the chamber; a catalyst bed which is disposed in the space defined between the first and second fixed cones, throug