H[beta] molecular sieve preparing method capable of increasing silicon-aluminum ratio

Abstract

The invention relates to an H[beta] molecular sieve preparing method capable of increasing the silicon-aluminum ratio. The preparing method comprises following steps: (1) mixing a silicon dioxide source, an aluminum oxide source, a sodium oxide source and water, wherein molar ratios of the raw materials are described as follows: SiO2 / Al2O3=5-25, Na2O / SiO2=0.18-0.5 and H2O / SiO2=1-6, stirring the raw materials to generate initial gel and continuously stirring the gel until the gel is turned into dry gel, adding a [beta]-molecular sieve seed crystal, performing hydrothermal crystallization at 100-180 DEG C for 12-130 h, and filtering and washing a reaction product to obtain Na[beta] zeolite; and (2) adding water to the Na[beta] zeolite sample with pulping, adding an ammonium salt and an acid, performing a reaction at 20-110 DEG C for 0.5-24 h, filtering and washing a reaction product, and drying and roasting the reaction product to obtain an H[beta] molecular sieve. Because that the preparation process is free of organic template agents, a high-temperature roasting for removing the organic template agent is not required, so that the preparing method is reduced in cost effectively and is reduced in pollutant discharge. By means of the method in the invention, the high-quality H[beta] molecular sieve being 6-200 in the silicon-aluminum ratio can be synthesized with a low cost. The H[beta] molecular sieve can be used in conversion of hydrocarbons, and especially can be used as an excellent catalyst component in catalytic cracking, hydroisomerization and hydrocracking.

Description

technical field [0001] The invention belongs to the fields of inorganic chemistry, physical chemistry, material chemistry, catalytic chemistry and chemical engineering, and particularly relates to a method for synthesizing high silicon-aluminum ratio Hβ zeolite molecular sieve without organic template. Background technique [0002] Beta zeolite is a medium-pore molecular sieve (USP3308069) with a pore diameter between the large-pore faujasite and the medium-pore ZSM-5 zeolite (USP3308069), with a pore diameter of about 0.6nm. Widely used in hydrocracking (such as USP3923641, EP94827), hydrofining (such as USP4560655), conversion of light aliphatic hydrocarbons into aromatics (such as USP3760024), benzene alkylation (such as USP4891458), cracking (such as USP4423265), isomerization (such as USP4471145) and many other catalytic reactions. [0003] Traditional β molecular sieves are prepared in the presence of organic templates such as TEA+, with a silicon-aluminum ratio of 25...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to firstly overcome the disadvantages of expensive synthesis of β molecular sieves in the presence of organic templates such as TEA+ in traditional β molecular sieves, and secondly overcome the disadvantages of low silicon-aluminum ratio and low single-pot yield

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