Method for in-situ synthesis of nano Zn/Al-ZSM-5 molecular sieve with steam-assisted dry glue conversion method

A technology of dry rubber conversion and in-situ synthesis, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of large molecular sieve grain size, long crystallization time, and high energy consumption. The effect of shortening the curing time, reducing the acid strength and avoiding pollution

Pending Publication Date: 2019-10-08
HEILONGJIANG UNIV
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Problems solved by technology

[0004] The present invention aims to solve the problems of long crystallization time, high energy consumption, large molecular sieve grain size and large amount of waste liquid existing in the existing method for

Method used

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  • Method for in-situ synthesis of nano Zn/Al-ZSM-5 molecular sieve with steam-assisted dry glue conversion method
  • Method for in-situ synthesis of nano Zn/Al-ZSM-5 molecular sieve with steam-assisted dry glue conversion method
  • Method for in-situ synthesis of nano Zn/Al-ZSM-5 molecular sieve with steam-assisted dry glue conversion method

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Example Embodiment

[0024] Specific embodiment 1: The method for in-situ synthesis of nano-Zn / Al-ZSM-5 molecular sieve by the steam-assisted dry glue conversion method of this embodiment is implemented in the following steps:

[0025] 1. Weigh 1 part of aluminum isopropoxide, 21~85 parts of tetrapropylammonium hydroxide aqueous solution, 33~136 parts of ethyl orthosilicate, 0.9~1.0 parts of zinc nitrate hexahydrate and 27~110 parts of deionized water as raw material;

[0026] Wherein, the mass percentage of tetrapropylammonium hydroxide in the tetrapropylammonium hydroxide aqueous solution is 54.78%;

[0027] 2. Add the aluminum isopropoxide and tetrapropylammonium hydroxide aqueous solution in the raw materials to the deionized water and stir evenly to form a solution A; add the solution of zinc nitrate hexahydrate dissolved in deionized water to the A solution under stirring conditions In, stir evenly to form B solution; then add ethyl orthosilicate dropwise to B solution under stirring conditions an...

Example Embodiment

[0030] Specific embodiment two: this embodiment is different from specific embodiment one in that in step one, weigh 1 part of aluminum isopropoxide, 21-60 parts of tetrapropylammonium hydroxide aqueous solution, and 33-90 parts by mass. Ethyl orthosilicate, 0.9 to 1.0 parts of zinc nitrate hexahydrate and 27 to 80 parts of deionized water.

Example Embodiment

[0031] Specific embodiment three: This embodiment is different from specific embodiment one or two in that in step two, the aluminum isopropoxide, tetrapropylammonium hydroxide aqueous solution and deionized water in the raw materials are stirred at a speed of 750-800r / min Stir for 10-20min under the conditions of

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Abstract

The invention discloses a method for in-situ synthesis of a nano Zn/Al-ZSM-5 molecular sieve with a steam-assisted dry glue conversion method. The invention belongs to the field of preparation of zeolite molecular sieve catalysts and aims to solve the problems that a conventional method for synthesizing a nano Zn/Al-ZSM-5 molecular sieve is long in crystallization time, large in energy consumption, large in molecular sieve crystal granule size and large in product waste liquid amount. The method comprises the following steps: I, weighing raw materials; II, mixing aluminum isopropoxide, a tetrapropylammonium hydroxide solution, tetraethoxysilane, zinc nitrate hexahydrate and deionized water, and carrying out vacuum drying so as to obtain a dry glue; and III, grinding the dry glue, putting the dry glue into a vessel at the upper part of a crystallization kettle, supporting the vessel by using a bracket, feeding deionized water into the bottom of the crystallization kettle, and carrying out crystallization at 160-190 DEG C, so as to obtain the nano Zn/Al-ZSM-5 molecular sieve. By adopting the method disclosed by the invention, the problem that a product is hard to separate from a mother liquid in the hydrothermal crystallization process is effectively avoided, the yield of the molecular sieve can be greatly increased, and a waste liquid with organic matters and alkalis are not generated after crystallization.

Description

technical field [0001] The invention belongs to the field of preparation of zeolite molecular sieve catalysts, and in particular relates to a preparation method of nanometer Zn / Al-ZSM-5 zeolite molecular sieve with partial isomorphic replacement of zinc. Background technique [0002] Molecular sieve catalysts have excellent thermal stability, hydrothermal stability and outstanding shape selectivity, and are widely used in the fields of acid catalysis, selective oxidation and adsorption separation. At present, there are two major research directions around the synthesis of molecular sieves: (1) according to the functional requirements, directional design and construction of molecular sieve frameworks with special pore structures, and synthesis of microporous crystalline materials with new structures; (2) for existing molecular sieve materials , develop new preparation methods, and regulate the properties of molecular sieves such as diffusion and acidity. The traditional hydr...

Claims

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Application Information

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IPC IPC(8): C01B39/38B01J29/40
CPCB01J29/405C01B39/38C01P2004/64C01P2004/03C01P2002/72
Inventor 吴伟张克苏晓芳白雪峰
Owner HEILONGJIANG UNIV
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