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Method for synthesizing boron-containing molecular sieve

A synthesis method, molecular sieve technology, applied in molecular sieves and base exchange compounds, chemical instruments and methods, inorganic chemistry, etc.

Inactive Publication Date: 2009-09-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it can also be seen that the templates used in the synthesis are basically quaternary ammonium salts and straight-chain organic amines as the main templates, and there is no cyclic molecular amine as the template to synthesize B-ZSM-5 molecular sieves. to report

Method used

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  • Method for synthesizing boron-containing molecular sieve
  • Method for synthesizing boron-containing molecular sieve
  • Method for synthesizing boron-containing molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation process and steps of this embodiment are as follows:

[0017] (1) Synthesis of directing agent

[0018] Materials used: the silicon source is tetraethyl orthosilicate, and the organic base template is tetrapropylammonium hydroxide and deionized water. According to the molar ratio of the three substances, SiO 2 : Tetrapropylammonium hydroxide: H 2 O=1:0.15:15 to prepare the reaction mixed solution; then hydrolyze the gel at 60°C for 1 hour, then raise the temperature of the reaction mixture to 80°C, wash off the alcohol for 4 hours, and then age at 120°C for 3 hours to obtain the product Obtain the directing agent, stand-by;

[0019] (2) Preparation of reaction mixture

[0020] The following materials are used: the silicon source is fuming silica gel, the organic base template is hexamethyleneimine (HMI), the boron source is boric acid, the sodium source is sodium hydroxide and deionized water; each material is weighed in molar ratio , namely SiO 2 ...

Embodiment 2

[0025] The filtration and steps in this example are exactly the same as those in Example 1 above.

[0026] The difference is: ①In the synthesis process of the directing agent, the molar mass ratio of the substances used is different; that is, SiO 2 : Tetrapropylammonium hydroxide: H 2 O=1.0:0.2:30; the aging temperature is 80° C., and the aging is 3 hours. ② During the preparation of the reaction mixture, no sodium source is used; the organic base template is a mixture of hexamethyleneimine (HMI) and piperidine (PI), and the molar ratio of the two is HMI:PI=5:5 .

Embodiment 3

[0028] The filtration and steps in this example are exactly the same as those in Example 1 above.

[0029] The difference is: in the preparation process of the reaction mixture, sodium chloride is used as the sodium source, and piperidine (PI) is used as the organic base template to replace HMI. In addition, the amount of directing agent added is SiO in the silicon source 2 10% by weight.

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Abstract

The invention relates to a method for synthesizing a boron-containing molecular sieve, namely a method for synthesizing a B-ZSM-5 molecular sieve, which belongs to the technical field of inorganic chemical synthesis. The method is characterized in that cheap cyclic molecular amine and hexamethylene imine (HMI) or piperidine (PI) or a mixture thereof is taken as an organic alkali template agent, and a directing agent is prepared by the synthesis process of the directing agent; substances such as a silicon source, a boron source, a sodium source and the like are adopted; the mol mixture ratio of SiO2 in the silicon source to the organic alkali template agent to B2O3 in the boron source to Na2O in the sodium source to H2O is equal to 1: (0.5-2): (0.005-0.1): (0-0.15): (10-40), and a mixture solution is prepared; and then a certain amount of the directing agent is added into the solution, and then the boron-containing molecular sieve (B-ZSM-5) is obtained through hydro-thermal crystallization and processes such as filtration, washing, drying, baking and the like.

Description

technical field [0001] The invention relates to a method for synthesizing a boron-containing molecular sieve, that is, a method for synthesizing a B-ZSM-5 molecular sieve, which belongs to the technical field of inorganic chemical synthesis. Background technique [0002] ZSM-5 zeolite molecular sieve is a new type of molecular sieve developed by Mobil Corporation of the United States in the 1970s. Due to its unique structure, the range of catalytic acidity can be adjusted well through modification, so it is widely used in petroleum refining, organic synthesis, pharmaceuticals and other fields. [0003] At present, ZSM-5 molecular sieves substituted by Ti, Ga, B, Fe, Sn, Cr and other heteroatoms have been synthesized one after another. Wherein, the boron-containing molecular sieve is obtained from Taramasso et al. .) Since it was first reported in 1980, due to its weak acidity, it has shown outstanding advantages over silicon-aluminum ZSM-5 in double bond isomerization, ald...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/12
Inventor 张海娇朱俊骅阎婧程善君李智勇文燎勇王艳丽焦正
Owner SHANGHAI UNIV
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