Process for the preparation of monolith catalysts for selective catalytic reduction of nitrogen oxides

摘要

A method of preparing a monolith SCR catalyst having a plurality of gas flow paths, comprising: (a) preparing a monolith-shaped substrate having a plurality of parallel gas flow paths; and (b) a wash containing titania. Coating with a coating slurry, (c) drying and baking the washcoat slurry, and (d) impregnating the dried and baked washcoat with an aqueous impregnation solution containing a vanadium oxide precursor; e) drying the coated and impregnated washcoat in the flow direction through the gas flow path at a drying speed of 5 mm / min or less; and (f) firing the coated, impregnated and dried washcoat. And activating the method.