Synthesis method of lamellar ZSM-5 zeolite

A technology of ZSM-5 and synthesis method, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve problems such as difficulty in large-scale application, high synthesis cost, and environmental pollution. Achieve the effects of low synthesis cost, improved reaction performance, and less environmental pollution

Active Publication Date: 2016-10-12
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, in the prior art, most of the synthesis of thin-layered ZSM-5 zeolite relies on organic macromolecular quaternary ammonium salt templates. This process not only has high synthesis costs and complicated processes, but also subsequent treatment will cause environmental pollution. Difficult to apply on a large scale in industry

Method used

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  • Synthesis method of lamellar ZSM-5 zeolite
  • Synthesis method of lamellar ZSM-5 zeolite
  • Synthesis method of lamellar ZSM-5 zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of synthetic method of thin-layer ZSM-5 zeolite, comprises the steps: 5g micron ZSM-5 molecular sieve (particle diameter is about 7 μm) crystal seed is used 50ml 3wt% sodium hydroxide solution at 40 ℃ and stirs pretreatment 5h , as a seed solution for later use.

[0030] 150g tetraethyl orthosilicate (TEOS) (technical grade, SiO 2 ≥30wt%) was dispersed in 70g of desalted water, then 80g of NaOH solution with a mass fraction of 10% was added, and fully stirred at room temperature for 0.5 hours to prepare A solution;

[0031] Mix 70g of desalinated water and 4.1g of aluminum sulfate octadecahydrate, stir and fully dissolve at room temperature for 0.5 hours to prepare B solution;

[0032] Slowly add solution B into solution A, stir well at room temperature for 1 hour, then add 20 g of the above-mentioned seed liquid under stirring conditions, and adjust the pH value of the system to about 10 with hydrochloric acid solution to form a uniform gel, and then transfer t...

Embodiment 2

[0034] Repeat Example 1, but change the micron ZSM-5 zeolite to nano ZSM-5 zeolite in the seed crystal, and change the mass fraction of sodium hydroxide from 3 wt% to 5 wt%. Other conditions remain unchanged. The relative crystallinity of the obtained zeolite sample was characterized as 96%, and the thin layer thickness of the sample characterized by scanning electron microscope was 40nm. The specific surface area of ​​the nitrogen physical adsorption test sample is 520m 2 / g, the total pore volume is 0.32cm 3 / g.

Embodiment 3

[0036] Repeat Example 1, but change TEOS to silica sol, change aluminum sulfate to sodium aluminate, and change the crystallization temperature to 185°C. Other conditions remain unchanged. The relative crystallinity of the obtained zeolite sample was characterized as 93%, and the thin layer thickness of the sample was characterized by a scanning electron microscope as 60 nm. The specific surface area of ​​the nitrogen physical adsorption test sample is 500m 2 / g, the total pore volume is 0.29cm 3 / g.

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Abstract

The invention provides a synthesis method of lamellar ZSM-5 zeolite. The synthesis method comprises the following steps: crystal seed pretreatment, silica-alumina gel preparation and the like. The synthesized zeolite is a typical MFI structure, has the advantages of high crystallinity and large specific area, has the lamellar shape with the lamellar thickness of 50nm or so, and has favorable application potential in the aspects of high-molecular reaction and the like by using the unique shape and physical property characteristics. Compared with the prior art, the synthesis method does not need any organic template or surfactant, has the advantages of simple synthesis technique operation, lower cost, no environment pollution and the like, and thus, can be popularized and applied in industry.

Description

technical field [0001] The invention belongs to the field of aluminosilicate zeolite synthesis, in particular to a method for synthesizing thin-layered ZSM-5 zeolite. Background technique [0002] ZSM-5 zeolite was developed by Mobil Corporation in 1972 and has a two-dimensional ten-membered ring channel structure. ZSM-5 is widely used in petrochemical fields such as shape-selective catalysis, isomerization, disproportionation, and alkylation because of its unique pore structure, good hydrothermal stability, and excellent catalytic performance. However, with the continuous expansion of application fields, different reaction systems have different requirements for the particle size, specific surface area, and pore volume of ZSM-5 zeolite materials. Molecular reactions require, limiting the diffusion of reacting molecules to the active center. [0003] Reducing the thickness of zeolite crystals can significantly improve the pore diffusivity of ZSM-5 zeolite, such as reducing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
CPCC01B39/38C01P2002/72C01P2004/03C01P2006/12C01P2006/14
Inventor 赵文平耿玉侠马国栋王元平孙承宇
Owner CHINA TIANCHEN ENG
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