Method for synthesizing novel thin layer ZSM-5 zeolite with boron-containing framework

A technology of ZSM-5 and synthesis method, which is applied in the directions of borocarbonane silicone crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve problems such as affecting application, and achieve adjustable surface acid properties and large specific surface. , the effect of broad application prospects

Inactive Publication Date: 2013-02-27
中国寰球工程有限公司辽宁分公司 +1
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  • Application Information

AI Technical Summary

Problems solved by technology

The boron-containing ZSM-5 molecular sieve (B-ZSM-5) shows outstanding advantages over conventional silica-alumina ZSM-5 zeolites in the rearrangement of aldehydes and ketones and dehydration reactions, but the diffusion limitation of conventional B-ZSM-5 zeolites is severe. Influencing its application in macromolecular reactions

Method used

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  • Method for synthesizing novel thin layer ZSM-5 zeolite with boron-containing framework
  • Method for synthesizing novel thin layer ZSM-5 zeolite with boron-containing framework
  • Method for synthesizing novel thin layer ZSM-5 zeolite with boron-containing framework

Examples

Experimental program
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Effect test

Embodiment 1

[0040] a. Synthesis of double quaternary ammonium salt template

[0041] Add 1-bromocarbodococane and N,N,N',N'-tetramethyl-1,6-hexanediamine into the round-bottomed flask, and add 100ml of a mixed solution of toluene and acetonitrile, in which bromine The molar ratio of alkanes and diamines is 1:10, and toluene / acetonitrile (v / v)=1:1. The flask was placed in an oil bath under reflux at 100°C for 12 hours. The resulting product was washed 3 times with cold diethyl ether, and dried under vacuum at 50°C for 18 hours to obtain a white waxy solid C 22 h 45 -N(CH 3 ) 2 -C 6 h 12 -N(CH 3 ) 2 Br, marked C 22-6-0 Br.

[0042] the resulting C 22-6-0 Add Br, 1-bromo-n-hexane and 100ml acetonitrile into the round bottom flask, where C 22-6-0The molar ratio of Br and n-bromohexane is 1:3. The flask was placed in an oil bath under reflux at 100°C for 24 hours. The resulting product was washed 3 times with cold ether, and dried under vacuum at 50°C for 18 hours to obtain a whi...

Embodiment 2

[0051] In the preparation process of the catalyst in this example, water glass was used as the silicon source, aluminum sulfate was used as the aluminum source, and boric acid was used as the boron source. Template agent and synthesis steps are exactly the same as in Example 1, and the obtained catalyst is marked as L-BZSM5-2.

Embodiment 3

[0053] In the preparation process of the catalyst in this example, silica sol was used as the silicon source, aluminum nitrate was used as the aluminum source, and sodium borate was used as the boron source. Template agent and synthesis steps are exactly the same as in Example 1, and the obtained catalyst is marked as L-BZSM5-3.

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Abstract

The invention belongs to the crossing field of inorganic synthesis chemistry and material chemistry and relates to a method for synthesizing a thin layer ZSM-5 zeolite with a boron-containing framework. The method includes that a silicon source, a boron source, an aluminum source and a biquaternary ammonium salt template agent are mixed with deionized water to synthesize the thin layer ZSM-5 zeolite with a framework simultaneously containing boron and aluminum in one step through a hydrothermal process. The synthesized zeolite has the advantages that the thin layer sheet shaped appearance is achieved, the degree of crystallinity is high, the synthesized zeolite is in a typical MFI structure, a large outer surface area is achieved, a surface acidity site is fully exposed, and acid strength and strong acid site proportion on the surface of the zeolite can be effectively controlled by adjusting a ratio of boron and aluminum in a fed material. The thin layer ZSM-5 zeolite with the boron-containing framework has an excellent application potential in an acid catalyzed reaction and particularly in a macromolecule splitting and polysaccharide hydrolysis reaction.

Description

technical field [0001] The invention belongs to the interdisciplinary technical fields of material chemistry, inorganic synthesis chemistry and chemical catalysts, and relates to a novel thin-layer ZSM-5 zeolite with a boron-containing skeleton and a synthesis method thereof. Background technique [0002] ZSM-5 zeolite molecular sieve was developed by Mobil Corporation in 1972 [USP 3702886], which has a two-dimensional ten-membered ring channel. Due to its unique pore structure, good thermal stability and hydrothermal stability, it has been widely used in petrochemical, fine product synthesis and other industries, but its too small micropore diameter (< 1 nm) hinders macromolecular reactions The substrate enters the zeolite channel, and the reaction is limited by diffusion, which affects the catalytic activity of macromolecules. [0003] Reducing the thickness of zeolite crystals can significantly improve the diffusion performance of ZSM-5 zeolite, such as synthetic nano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40
Inventor 曾蓬沈虹韩建新王世美林丽丽唐颐陈晶
Owner 中国寰球工程有限公司辽宁分公司
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