Process for purification of exhaust gases and catalyst used for purification of exhaust gases in this process

A process for purification of exhaust gases from gas turbines, which is a process for purification of exhaust gases to remove CO therefrom, being characterized by comprising the step of bringing the exhaust gases into contact with a catalyst layer at a temperature of 250 to 600° C., a pressure drop of not more than 100 mmH2O, and a linear velocity of 0.5 to 10 m/s, wherein the catalyst layer includes a porous honeycomb-structural catalyst having an opening size of 1.0 to 3.0 mm, an opening ratio of 60 to 80%, a total pore volume of 0.20 to 0.80 cm3/g as measured by the mercury penetration method, an average pore diameter of 0.010 to 0.50 μm, a specific surface area of not less than 20 m2/g as measured by the BET method, and an inner wall thickness of 0.1 to 0.5 mm and where said porous honeycomb-structural catalyst consists essentially of a calcined porous honeycomb support and a catalytic component, and said porous honeycomb-structural catalyst is obtained by a process including the steps of extrusion-molding materials of the support;

• calcining the extrusion-molded materials of the support in the temperature range of 200 to 600° C. to obtain said calcined porous honeycomb support having porous inner surfaces and porous outer surfaces;
• and thereafter supporting said catalytic component directly onto said inner and outer surfaces of said calcined porous honeycomb support.