Preparation of binderless ZSM-11 zeolite

A ZSM-11, binder-free technology, applied in the direction of crystalline aluminosilicate zeolite, borane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of reduced effective surface area, easy deactivation and aggregation, and small zeolite size and other problems, to achieve the effect of accelerating the transformation speed, avoiding the nucleation growth period, and reducing the grain size
CN101348261AActive Publication Date: 2009-01-21CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2009-01-21

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Abstract

The invention relates to a method for preparing no-binding agent ZSM-11 zeolite, which mainly aims at overcoming the defects of difficult recovery, easy deactivation and easy aggregation existing in the practical application of the zeolite powder and the problems of small effective surface area and limited diffusion due to the addition of the binding agent in the forming process. In the invention, at least one of diatomaceous earth, carbon white, silicasol or water glass is taken as a silicon source, at least one of aluminum oxide, aluminum salt or aluminate is taken as an aluminum source, and proper quantity of necessary crystal seed guiding agents are added and subjected to pugging, extrusion and forming so as to obtain a precursor mixture with the mass ratio of XNa2O:YAl2O3:100SiO2, wherein x is between 0.5 and 14, and y is between 0 and 6, and the precursor mixture is subjected to hydrothermal crystallization treatment in the water solution containing tetrabutyl ammonium positive ions and converted to the no-binding agent ZSM-11 zeolite. The technical proposal of the invention better resolves the problems, and can be applied to the industrial preparation of the ZSM-11 zeolite molecular sieve catalyst.
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Description

technical field

[0001] The invention relates to a preparation method of binder-free ZSM-11 zeolite. Background technique

[0002] Zeolite molecular sieves have uniform and ordered micropores, large specific surface area, and high hydrothermal stability, and are widely used in the field of catalysis. Zeolite has a shorter intracrystalline diffusion channel length and a larger outer surface, which is conducive to increasing the contact opportunity between the reactant and the active site in the micropore, thereby improving the performance of the zeolite, and showing unique advantages in the reaction , such as unique macromolecular selectivity, higher catalytic activity and longer catalyst life. However, the size of zeolite is too small, which is not very convenient in practical application. It has disadvantages such as difficult recovery, easy deactivation and aggregation. Binders need to be added during the molding process. As a result, the effective surface area is reduced ...

Claims

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