| 摘要 |
A method of reducing nitrogen oxides in exhaust gas of an internal combustion engine by selective catalytic reduction (SCR) comprises contacting the exhaust gas also containing ammonia and oxygen with a catalytic converter comprising a catalyst comprising at least one crystalline small pore molecular sieve catalytically active component having a maximum ring opening of eight tetrahedral basic building blocks, which crystalline small pore molecular sieve catalytically active component comprises mesopores. A method for producing an extruded shaped body comprising the catalyst is also disclosed. The method comprises preparing an extruded book composition comprising at least one crystalline small pore molecular sieve catalytically active component and having a maximum ring opening of eight tetrahedral basic building blocks, extruding the extruded will composition into a shaped body and introducing mesopores into the at least one crystalline small pore molecular sieve in the shaped body by alkaline treatment. |
