Method for removing nitrogen oxide from exhaust gas by selective catalytic reduction in the presence of SCR catalyst containing not only alkaline metal intrinsic fe-aei zeolite material

摘要

A method for the removal of nitrogen oxides from exhaust gas, flue gas or off gas by selective catalytic reduction in the presence of ammonia as reducing agent, the exhaust gas with ammonia or a precursor thereof, having the following molar composition: SiO 2: o Al 2 O 3: p Fe: q Al k [wherein, o is in the range of 0.001 to 0.2, p is in the range of 0.001 to 0.2, and Al k is one or more alkali metals] It is an ion and q is less than 0.02. Contacting the catalyst with an SCR catalyst comprising a Fe-AEI zeolitic material essentially free of alkali metal ions (Alk).