Preparation method of CuCeSAPO-34 molecular sieve, product obtained therethrough, and use of product

Abstract

The invention relates to a preparation method of CuCeSAPO-34 molecular sieve, a product obtained therethrough, and a use of the product. The preparation method comprises the following steps: adding tetraethylammonium hydroxide to deionized water, stirring the tetraethylammonium hydroxide and deionized water to obtain a uniform solution, adding aluminum isopropoxide, adding orthophosphoric acid andethyl orthosilicate after the aluminum isopropoxide is completely dissolved, uniformly mixing the obtained solution, adding a cerium salt, fully stirring the solution and the cerium salt, adding a copper salt, adding the obtained completely stirred sol into a hydrothermal reactor, crystallizing the sol, carrying out room temperature cooling, separating the obtained solid crystallization product with the obtained mother liquor, washing the solid crystallization product until the solid crystallization product is neutral, drying the washed solid crystallization product, and calcining the dried solid crystallization product in air to obtain the CuCeSAPO-34 molecular sieve catalyst. Copper and cerium are introduced, a subsequent ion exchange step is avoided, the molecular sieve catalyst with different catalysis activities is obtained by using the cooperative effect of copper and cerium, controlling the addition amount of the cerium salt and adjusting the load capacity of cerium, and the preparation method has the advantages of good crystallinity and simple synthesis steps.

Description

technical field [0001] The invention belongs to the field of molecular sieve preparation, and in particular relates to a preparation method, product and application of CuCeSAPO-34 molecular sieve. Background technique [0002] Take NH 3 Selective Catalytic Reduction of NO as Reductant x i.e. NH 3 -SCR technology plays an extremely important role in the process of catalytic removal of NOx, and its key core is the development of SCR catalyst system. [0003] Nitrogen oxides (NO x ), whose main sources are mobile sources (motor vehicles, accounting for about 49%) and stationary sources (thermal power plants, industrial boilers, accounting for about 46%), which have caused serious pollution to the ecological environment and living environment. At present, the more mature flue gas denitrification technology in industrial application is the NH with vanadium-titanium series as the main catalyst. 3 -SCR technology, V 2 o 5 -WO 3 -TiO 2 Although catalysts have been used indu...

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Problems solved by technology

[0004] Small-pore molecular sieve CuSAPO-34 has excellent denitrification catalytic performance, small pore size, good selectivity for nitrogen oxide catalysis, large specific surface area, improved catalytic conversion rate, high hydrothermal stability, and overcomes harsh conditions. Reaction conditions, however, its synthesis cost is high, which limits the application of molecular sieves. At the same time, the content and form of Cu seriously affect the catalytic performance of the material. If a method for synthesizing high-performance materials at low cost is explored, its application value will be more extensive

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