Preparation method of binderless mordenite/MCM-22 symbiotic molecular sieve catalyst

Abstract

The invention relates to a preparation method of a binderless mordenite / MCM-22 symbiotic molecular sieve catalyst, mainly solving the problems of complicated preparation process and higher cost of a traditional preparation process of a mordenite / MCM-22 symbiotic molecular sieve by using a hydro-thermal synthesis method. By adopting the technical scheme that the preparation method comprises the following steps of: mixing, forming and drying 10-80 percent by weight of mordenite / MCM-22 symbiotic molecular sieve, 0.1-20 percent by weight of alkaline matters, 0.5-20 percent by weight of aluminum compounds and 10-80 percent by weight of monox binder, then putting into steam containing at least one template agent selected from ammonia water, ethylenediamine, triethylamine, n-butylamine, hexamethylene diamine, tetraproylammonium bromide, tetrapropylammonium hydroxide or hexamethylene imine, crystallizing at 100-200 DEG C for 10-300h to obtain the binderless mordenite / MCM-22 symbiotic molecular sieve catalyst, the invention favorably solves the problems and can be used in the industrial preparation of the binderless mordenite / MCM-22 symbiotic molecular sieve catalyst, and the prepared catalyst can be used in a reaction for preparing propylene by catalytically cracking naphtha.

Description

technical field [0001] The invention relates to a preparation method of a binder-free mordenite / MCM-22 symbiotic molecular sieve catalyst. Background technique [0002] Molecular sieves are widely used in petrochemical and other fields because of their uniform and regular pore structure, large specific surface area and high thermal stability, and good shape-selective catalytic performance and adsorption performance. Because molecular sieve powder itself has low strength and is easy to disperse and lose, it cannot be directly applied in industry. Therefore, it is necessary to add a binder during molding to increase the strength. In the molded catalyst, because the binder wraps the molecular sieve, resulting in The effective utilization rate of molecular sieves decreases, and the pores of some molecular sieves are blocked, resulting in low specific surface area and low activity of the catalyst. Because the binder has an irregular pore structure, it is difficult for the reactio...

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that the preparation process of mordenite / MCM-22 symbiotic molecular sieve in the prior art uses a hydrothermal synthesis method, the preparation process is complicated, the cost is high, and the mordenite / MCM-22 symbiotic molecular sieve catalyst contains binding In order to solve the problems of low activity, low strength of binder-free mordenite / MCM-22 intergrowth molecular sieve and low activity of mechanical mixture of binder-containing mordenite and MCM-22 molecular sieve, a new Method for preparing binder-free mordenite / MCM-22 intergrowth molecular sieve catalyst

Images