Preparation method of mesoporous-microporous composite molecular sieve

A composite molecular sieve and microporous molecular sieve technology, which is applied in the field of preparation of mesoporous-microporous composite molecular sieves, can solve the problems of inconspicuous mesoporous structure of composite molecular sieves, channel blockage, channel collapse, etc., so as to improve hydrothermal and thermal stability. , The effect of improving the ratio of silicon to aluminum and high crystallinity
CN103100399AActive Publication Date: 2013-05-15CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2013-05-15

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Abstract

The invention discloses a preparation method of a mesoporous-microporous composite molecular sieve. The preparation method comprises the following steps of adding a microporous molecular sieve subjected to hydrothermal treatment into a mixed system of a silicon source, an acid solution and a surfactant, then carrying out crystallization, filtration and washing, and then carrying out drying and calcination to obtain the mesoporous-microporous composite molecular sieve. The preparation method fully utilizes non-framework aluminum falling from the microporous molecular sieve, avoids an aluminum source used by the conventional molecular sieve preparation technology, is conducive to improvement of a silica-alumina ratio of the mesoporous-microporous composite molecular sieve, realizes a high degree of crystallization, and improves hydrothermal stability and thermostability of the mesoporous-microporous composite molecular sieve. The mesoporous-microporous composite molecular sieve is suitable for the field of macromolecule catalysis, is conducive to improvement of a reaction conversion ratio and reaction selectivity, and is especially suitable for being used in a cracking catalyst for maximum-degree production of middle distillate from heavy oil as a raw material.
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Description

Technical field

[0001] The present invention relates to a method for preparing a mesoporous-microporous composite molecular sieve, in particular to a method for preparing a mesoporous-microporous composite molecular sieve used for hydrocracking catalysts. Background technique

[0002] Hydrocracking catalysts are typical dual-functional catalysts with acidic functions and hydrogenation-dehydrogenation functions. The hydrogenation-dehydrogenation functions of the catalyst are generally composed of Group VIII transition metal elements or Ni, Co sulfides and promoters. Mo and W sulfides are provided; the acidic function is provided by the acid center of the carrier. As crude oil becomes heavier, traditional zeolite molecular sieves are no longer able to meet the processing needs of heavy oil with a molecular diameter of about 1 to 2 nm due to limitations of the material itself (pore size is generally less than 1 nm). Mesoporous materials have larger pore sizes and have broad ap...

Claims

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