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ZSM-5 molecular sieve with nanosheet layer structure and synthesis method thereof

A technology of ZSM-5 and nanosheets, which is applied in the field of nanosheet structure ZSM-5 molecular sieves and its synthesis, can solve the problems of increasing the steps of seed crystal gel precursor, increasing the cost of raw materials, and complicating the synthesis process, etc., to achieve High yield, reduced production cost, and high crystallinity

Inactive Publication Date: 2016-10-12
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent (ZL 201310201578.9) discloses a method for preparing a hierarchically porous ZSM-5 molecular sieve. Although the method can be used to obtain a monolithic hierarchically porous ZSM-5 molecular sieve composed of nanosheets, in the molecular sieve synthesis process, it is necessary to Adding the seed gel precursor increases the steps to prepare the seed gel precursor, complicates the synthesis process, and ultimately increases the raw material cost

Method used

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  • ZSM-5 molecular sieve with nanosheet layer structure and synthesis method thereof
  • ZSM-5 molecular sieve with nanosheet layer structure and synthesis method thereof
  • ZSM-5 molecular sieve with nanosheet layer structure and synthesis method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] (1) Dissolve potassium hydroxide (0.939g) in 36.166g deionized water to form solution A, add weighed tetrapropylammonium hydroxide (2.039g) and aluminum isopropoxide (0.274g) to part A solution (40% of the total mass) was stirred for 2 hours to form a solution B;

[0042] (2) Slowly add an appropriate amount of ethyl tetrasilicate (5.58g) dropwise into the solution of part A (30% of the total mass) and stir for 2 hours to form solution C;

[0043] (3) Add B to C and stir for 5 hours to form solution D;

[0044] (4) Cetyltrimethylammonium bromide (0.488g) is joined in part A solution (30% of total mass), after stirring for 2h, join in D solution and continue to stir for 2h to form reaction mixture, at 175 Hydrothermal crystallization at ℃ for 7d;

[0045] (5) After the reaction, the sample was taken out, rinsed with a large amount of water, dried overnight at 120°C, and then baked in a muffle furnace at 550°C for 6 hours. The nanosheet structure ZSM-5 molecular sieve ...

Embodiment 2

[0048] (1) Dissolve potassium hydroxide (0.939g) in 36.166g deionized water to form solution A, and add the weighed tetrapropylammonium bromide (2.039g) and aluminum isopropoxide (0.274g) to part A solution (40% of the total mass) was stirred for 2 hours to form a solution B;

[0049] (2) Slowly add an appropriate amount of ethyl tetrasilicate (5.58g) dropwise into the solution of part A (30% of the total mass) and stir for 2 hours to form solution C;

[0050] (3) Add B to C and stir for 5 hours to form solution D;

[0051] (4) Hexadecyltrimethylammonium bromide (0.488g) was added to the part A solution (30% of the total mass), after stirring for 2h, it was added to the D solution and continued to stir for 1h to form a reaction mixture. Hydrothermal crystallization at ℃ for 7d;

[0052] (5) After the reaction, the sample was taken out, rinsed with a large amount of water, dried overnight at 120°C, and then baked in a muffle furnace at 550°C for 6 hours. The nanosheet struct...

Embodiment 3

[0055] (1) Potassium hydroxide (0.939g) was dissolved in 36.166g deionized water to form solution A, and the weighed monobenzyl bromide (2.039g) and aluminum isopropoxide (0.274g) were added to part A solution (40% of the total mass) was stirred for 3h to form solution B;

[0056] (2) slowly drop an appropriate amount of ethyl tetrasilicate (5.58 g) into the solution of part A (30% of the total mass) and stir for 4 hours to form solution C;

[0057] (3) Add B to C and stir for 6 hours to form solution D;

[0058] (4) Hexadecyltrimethylammonium bromide (0.488g) is joined in part A solution (30% of total mass), after stirring for 3h, join in D solution and continue to stir for 4h to form reaction mixture, at 170 Hydrothermal crystallization at ℃ for 12d;

[0059] (5) After the reaction, the sample was taken out, rinsed with a large amount of water, dried overnight at 100°C, and then baked in a muffle furnace at 600°C for 4 hours. The nanosheet structure ZSM-5 molecular sieve ...

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Abstract

The invention discloses a ZSM-5 molecular sieve with a nanosheet layer structure and a synthesis method thereof; the ZSM-5 molecular sieve with the nanosheet layer structure is formed by cluster stacking of nanosheet layers with the thickness of 10 to 30 nm; an organic quaternary ammonium salt and an amphiphilic cationic surfactant are used as structure directing agents and template agents, potassium hydroxide or sodium hydroxide is used as an alkali source, a synthesis solution with the molar ratio of (20-100)SiO2:(0.4-3)Al2O3:(10-30)TPA:(10-50)ROH:(1000-3000)H2O:(1-10)SDA is prepared through a conventional hydrothermal crystallization method, and the product is washed, dried and roasted to obtain the ZSM-5 molecular sieve with the nanosheet layer structure. The molecular sieve is an MFI type molecular sieve having the sheet layers and multi-level pore channel structure and has the characteristics of relatively large specific surface area, relatively short diffusion path and relatively good stability.

Description

technical field [0001] The invention relates to the technical field of molecular sieve synthesis, in particular to a nano sheet structure ZSM-5 molecular sieve and a synthesis method thereof. Background technique [0002] Mobil Corporation of the United States reported the synthesis of ZSM-5 molecular sieve for the first time in 1972, because of its ordered microporous structure, large specific surface area, high thermal stability and hydrothermal stability, skeleton acid center, exchangeable It has become one of the most widely used catalysts in industry due to its excellent properties such as cations. However, the smaller micropore channels of the microporous ZSM-5 molecular sieve prevent larger molecules from entering the zeolite channels for adsorption and catalytic reactions, and limit the diffusion of macromolecules. In order to overcome the limitation of a single channel, researchers have considered the solution of combining channels at all levels, such as introducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38B82Y40/00B01J29/40B01J35/10
CPCC01B39/38B01J29/40C01P2004/64C01P2004/03C01P2004/20C01P2002/72B01J35/60B01J35/40
Inventor 王政宋智安梅邵秀丽
Owner NINGXIA UNIVERSITY
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