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Synthesis method of Ga isomorphous substituted nanometer GaZSM-22 molecular sieve

A technology of isomorphic substitution and synthesis method, which is applied in the field of synthesis of nano-GaZSM-22 molecular sieves, can solve the problems of large particle size and achieve the effects of reduced particle size, weakened acid strength, and improved accessibility

Active Publication Date: 2019-03-26
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the Ga isomorphous ZSM-22 molecular sieve prepared by the existing method has too large a particle size, and a method for synthesizing a Ga isomorphously substituted nanometer GaZSM-22 molecular sieve is provided

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  • Synthesis method of Ga isomorphous substituted nanometer GaZSM-22 molecular sieve
  • Synthesis method of Ga isomorphous substituted nanometer GaZSM-22 molecular sieve
  • Synthesis method of Ga isomorphous substituted nanometer GaZSM-22 molecular sieve

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specific Embodiment approach 1

[0025] Specific embodiment one: the present embodiment is a kind of synthetic method of the Ga ZSM-22 molecular sieve that isomorphously substituted by Ga, specifically completes according to the following steps:

[0026] 1. Preparation of mixed gel:

[0027] a. Weigh 1 part of gallium trioxide, 50-90 parts of silicon source, 15-27 parts of 1,6-hexanediamine, 10-18 parts of potassium hydroxide and 1750-3150 parts of deionized water in molar parts ; Divide 1750-3150 parts of deionized water into four parts according to the volume ratio of 3:4:3:2, followed by deionized water I, deionized water II, deionized water III and deionized water IV;

[0028] b. Mix 10-18 parts of potassium hydroxide weighed in step 1a with deionized water I to prepare a potassium hydroxide solution;

[0029] c. Mix 1 part of gallium trioxide weighed in step 1a with deionized water II to obtain a gallium trioxide suspension, and add the gallium trioxide suspension to the potassium hydroxide obtained in ...

specific Embodiment approach 2

[0033] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the atomic ratio of Si in the silicon source to Ga in gallium trioxide in Step 1a is 25-45:1. Others are the same as the first embodiment.

specific Embodiment approach 3

[0034] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the silicon source in Step 1a comes from silica sol with a mass fraction of 20.0-40.0%. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a synthesis method of a Ga isomorphous substituted nanometer GaZSM-22 molecular sieve, and relates to a synthesis method of the nanometer GaZSM-22 molecular sieve. The invention aims to solve the problem that a GaZSM-22 molecular sieve prepared through an existing method is large in size. The synthesis method comprises the steps of (1) mixed gel preparation and (2) crystallization, wherein the Ga isomorphous substituted nanometer GaZSM-22 molecular sieve is obtained. The synthesis method has the beneficial effects that the Ga isomorphous substituted nanometer GaZSM-22 molecular sieve is rodlike nanometer crystals, the particle size is 20-50 nm, the grain length is 50-100 nm, a ratio of silicon to gallium is (25 to 45) to 1, and a molecular sieve skeleton does not contain aluminium atoms. The synthesis method is mainly used for conducting Ga isomorphous substitution to synthesize the nanometer GaZSM-22 molecular sieve.

Description

technical field [0001] The invention relates to a method for synthesizing GaZSM-22 molecular sieves substituted by Ga isomorphs. Background technique [0002] Zeolite molecular sieve is a microporous crystal material with regular pore structure, large specific surface area, strong acidity and high stability. It is one of the most important shape-selective catalysts and carriers in modern petrochemical industry. , is widely used in industrial production processes such as catalysis, adsorption and ion exchange. ZSM-22 molecular sieve is a microporous zeolite molecular sieve with TON topology developed by Mobil Corporation of the United States in the 1980s. It has one-dimensional linear non-intersecting straight channels with ten-membered ring openings, and the pore size is 0.45nm×0.55nm. Due to its suitable pore structure and acidity, ZSM-22 molecular sieve has been widely used in petrochemical fields such as catalytic dewaxing of lubricating oil, alkylation of aromatic hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B82Y40/00
CPCB82Y40/00C01B39/04C01P2002/72C01P2004/03C01P2006/42C01P2004/64
Inventor 王巍吴伟李彤白雪峰苏晓芳冯兆路
Owner HEILONGJIANG UNIV
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