Cerium-iron molecular sieve based catalyst with wide temperature range and preparation method thereof

Abstract

The invention discloses a cerium-iron molecular sieve based catalyst with a wide temperature range and a preparation method thereof. A novel MCM-22 molecular sieve is used as a catalyst, the synthesischaracteristics of the molecular sieve are utilized, Fe is introduced in situ in the hydrothermal synthesis process to serve as an active site of an NH3-SCR reaction, an Fe-MCM-22 catalyst is obtained, then an active component Ce is introduced through an isopyknic impregnation method, and the bimetal supported Ce / Fe-MCM-22 catalyst is prepared and used for removing nitrogen oxide through NH3-SCR.The Fe-MCM-22 catalyst prepared by the method has the advantages that the active Fe component is uniformly dispersed, the low-temperature catalytic activity of the catalyst is obviously improved, andthe temperature window is widened; the catalyst has good dispersibility and redox property and is high in activity and is a Ce / Fe-MCM-22 catalyst which is high in activity and wide in active temperature interval.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide control in environmental protection, in particular to a preparation method and application of Fe and Ce composite molecular sieve catalysts, which are used for ammonia selective catalytic reduction of nitrogen oxides, and are suitable for diesel engines, lean-burn gasoline engines and industrial production NO under oxygen enriched conditions x Purification, such as NO in the flue gas of coal-fired power plants, smelters or oil refineries x deal with. Background technique [0002] Nitrogen oxides (NO x , mainly NO and NO 2 ) is an important class of air pollutants, which will lead to the formation of acid rain, photochemical smog, etc., and has biological respiratory toxicity, which will cause significant harm to human health and the ecological environment. NO x The main sources of flue gas include stationary sources of industrial flue gas, such as coke oven flue gas, flue gas emitted b...

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Problems solved by technology

However, the dispersion degree and existence state of the active metal species on the zeolite catalyst have a significant impact on the SCR performance of the catalyst.

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