ZSM-22/ZSM-23 composite molecular sieve and preparation method

Abstract

The present invention relates to a ZSM-22 / ZSM-23 compound molecular sieve and its synthesis method. The aluminosiica colloid obtained by mixing silicon source, aluminium source, inorganic alkali, water and template agent and ZSM-22 molcular sieve are mixed, then molar composition of said aluminosilica colloid includes SiO2 / Al2O3=60-300, R / SiO2=0.05-3, OH- / SiO2=0.05-0.5 and H2O / SiO2=10-65, and the added quantity of ZSM-22 molecular sieve is 0.01-0.6 of weight of silicon dioxide, and the template agent can be one of pyrrolidine, isopropyl amine and isobutyl amine or several kinds of them, and the obtained reaction mixture is undergone the process of hydrothermal crystallization so as to obtain the invented compound molecular sieve.

Description

technical field

[0001] The invention relates to a composite molecular sieve, in particular to a ZSM-22 / ZSM-23 composite molecular sieve.

[0002] The present invention also relates to the preparation method of the composite molecular sieve. Background technique

[0003] Zeolite molecular sieve materials have special shape-selective catalytic properties due to their uniform composition, regular structure, adjustable surface acidity and molecular size pores, and are used as catalytic materials, gas separation and adsorbents, ion exchangers, etc. It has been widely used in the fields of oil and natural gas processing, fine chemicals, environmental protection and nuclear waste treatment. The catalytic function of molecular sieves has also developed from simple acid catalysis to base catalysis, acid-base bifunctional catalysis, oxidation-reduction catalysis and metal catalysis. The basis of molecular sieve catalytic functionalization and application expansion is the development...

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