Method for preparing ZSM-5 zeolite catalyst

Abstract

The invention discloses a method for preparing a ZSM-5 zeolite catalyst. The method comprises the following steps: mixing mixed salt solution of a silicon source and a sodium source with aluminum salt solution according to a proportion to form silica-alumina gel, adding the silica-alumina gel and a template agent into a high-temperature high-pressure reaction kettle, and carrying out hydrothermalcrystallization for the mixture under set conditions to form the ZSM-5 catalyst. The method is characterized in that during the hydrothermal crystallization, CO2 gas is introduced above the liquid level at proper time to further adjust and control the pH value of a system; during synthesis, the raw material mixing rate, crystallization temperature and crystallization time are controlled so as to effectively solve the problem of grain size control during the preparation of the ZSM-5 zeolite catalyst; and the mean grain size of the prepared zeolite catalyst is 3 to 7mu m, and the range of the grain size is 2.5 to 8mu m. The ZSM-5 zeolite catalyst prepared by the method can be used for the test of preparing cyclohexanol by cyclohexene hydration.

Description

A kind of preparation method of ZSM-5 zeolite catalyst technical field The invention relates to a ZSM-5 zeolite catalyst and a preparation method thereof. In particular, it relates to a particle size control method in the preparation process of ZSM-5 zeolite catalyst. technical background At present, the cyclohexene hydration catalyst has eliminated the early inorganic acids and ion exchange resins, and now the cyclohexene hydration production process basically uses solid molecular sieves, because they are insoluble in water, easy to separate and regenerate, and have high mechanical strength. And good heat resistance and other advantages, the most successful in industrial applications. Cyclohexene hydration reaction catalyst mostly uses ZSM-5 zeolite molecular sieve. ZSM-5 zeolite molecular sieve was first synthesized by Mobile Company in the United States in the early 1970s, and its general chemical formula is: 【M2(I), M(II)】O·Al2O3·nSiO2·mH2O In the formula, M2(I),...

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Problems solved by technology

The purpose of the present invention is to provide a preparation method of ZSM-5 zeolite catalyst for the problem that the particle size is difficult to control in the preparation of ZSM-5 zeolite catalyst, and its average particle size is controlled within the range of 3-7 μm

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