Framework modification acid-alkali bifunctional ZSM-5 zeolite catalyst and method for preparing the same

Abstract

The invention pertains to a catalyst and application technology field thereof, which relates to a framework modification acid-alkali difunctional ZSM-5 zeolite catalyst and a preparation method and applications thereof. H-ZSM-5 zeolite is adopted by the catalyst as substrate material, and the substrate material is heated and hybrid reacted with nitrogenous modified raw material solvent and steam, then the catalyst is prepared. Part framework oxygen atom of the ZSM-5 zeolite of the catalyst is replaced by amine (nitrogen) group, thus the catalyst has acid-alkali difunctional catalyst property; the catalyst has the advantages of high crystallinity, open pore canal, comparatively larger specific surface, good molecular disperse property, high strength and excellent wearing resistance. Reclaiming process of the catalyst is convenient, and the reclaimed catalytic performance recovers well. The catalyst shows excellent catalytic activity, selectivity and stability in catalytic reactions of MTO, MTP, ETE and other alcohols dehydration to alkenes. The preparation method of acid-alkali difunctional ZSM-5 zeolite catalyst is simple, preparation cost is comparatively low and industrialized potential application range is wide.

Description

technical field [0001] The invention belongs to the technical field of catalyst materials and their applications, and in particular relates to a ZSM-5 zeolite catalyst and a preparation method thereof. Background technique [0002] Zeolite molecular sieve is an inorganic aluminosilicate or phosphate crystal, the skeleton contains regular and orderly arranged molecular-sized pores (ca. It is widely used in industrial processes such as catalysis, adsorption separation and ion exchange. [0003] A ZSM-5 zeolite (MFI type) molecular sieve developed by Mobil in 1972 [U.S. Patent 3702886, 1972] has a two-dimensional ten-membered ring channel (a ten-membered ring straight channel with an aperture of 0.54nm×0.56nm and a ten-membered Ring sinusoidal channel, the pore size is 0.51nm×0.54nm), is the most widely used catalytic material so far, it is one of the important active components in petroleum fluidized catalytic cracking (FCC) catalysts, and is used in petroleum hydrocracking ...

AI Technical Summary

Problems solved by technology

However, because the reactants or reaction products are easy to coke in the zeolite pores, the catalyst loses its activity and reduces its single-pass reaction life, so it is limited in large-scale industrial applications.

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