Hierarchical pore Fe-AFI molecular sieve type denitration catalyst and preparation method thereof

Abstract

The invention relates to the technical field of fine chemical engineering and inorganic materials, in particular to a hierarchical pore Fe-AFI molecular sieve type denitration catalyst and a preparation method thereof.The preparation method comprises the following steps that an aluminum source, a silicon source, a phosphorus source, iron oxide and a structure-directing agent are sequentially added into distilled water and evenly stirred, and initial gel is obtained; performing hydrothermal crystallization on the initial gel, and sequentially washing, drying and roasting a crystallized product to obtain the hierarchical porous Fe-coated AFI molecular sieve, the hierarchical pore Fe-coated AFI molecular sieve is subjected to active component and auxiliary agent loading and roasting, and the denitration catalyst is obtained. According to the method, the Fe-AFI molecular sieve with abundant intergranular mesopores formed by nanocrystalline accumulation can be prepared under the condition of not adding a secondary template agent, and the Fe-AFI molecular sieve is used as a denitration catalyst carrier to load an active component and an auxiliary agent, so that the high-temperature denitration activity of the catalyst can be greatly improved, an active temperature window is widened, the service life of the denitration catalyst is remarkably prolonged, and the application prospect is wide. The method has high industrial application value in the aspect of air pollution control.

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