Copper-iron molecular sieve based catalyst as well as preparation method and application thereof

Abstract

The invention discloses a copper-iron molecular sieve based catalyst as well as a preparation method and application thereof, and belongs to the technical field of denitration catalysis in environmental protection. According to the catalyst, MCM-22 and ZSM-5 are used as carriers, and loaded metals Cu and Fe are used as active components, the content of Cu accounts for 1.5-5.0% of the total weight of the copper-iron molecular sieve-based catalyst, the content of Fe accounts for 1.5-5.0% of the total weight of the copper-iron molecular sieve-based catalyst, the general formula of the copper-iron molecular sieve-based catalyst is xCu / yFe-MCM-22 / ZSM-5, wherein x is the mass percentage content of the metal Cu in the catalyst and is 2.0-4.5%, y is the mass percent content of metal Fe in the catalyst, and the value is 2.0-4.5%. The catalyst solves the problems that traditional copper-based and iron-based molecular sieve catalysts are narrow in temperature window and low in denitration activity, under the standard SCR reaction atmosphere condition, the denitration efficiency of the catalyst within the temperature range of 200-500 DEG C can reach 80% or above, and the catalyst has good low-temperature denitration activity and a wide temperature window.

Description

technical field [0001] The invention relates to a molecular sieve-based catalyst for selective catalytic reduction of nitrogen oxides by using ammonia gas, which belongs to the technical field of denitrification catalysis in environmental protection, and specifically relates to a copper-iron molecular sieve-based catalyst and its preparation method and application. Background technique [0002] Nitrogen oxide (commonly known as NOx, mainly containing NO) is a major pollutant in the atmosphere, which has great harm to the ecological environment and human health. It not only causes acid rain, but also forms near-surface atmospheric ozone pollution, secondary fine particle pollution and The precursor of surface water eutrophication, and the environmental problems caused by it have become the most prominent atmospheric environmental hotspot issues together with the destruction of the ozone layer and global climate change. The main sources of nitrogen oxides are vehicle exhaust (...

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Problems solved by technology

Rutkowska et al. (Applied Catalysis B: Environmental168-169 (2015) 531–539) prepared Fe / MCM-22 catalyst by ion exchange method, and its NH 3 -SCR performance is low, the activity temperature range is narrow, and together with the above-mentioned molecular sieve catalysts, there are disadvantages such as being easily poisoned by HC compounds to varying degrees, and low hydrothermal stability.

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