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A kind of superparamagnetic nano sheet structure ZSM-5 molecular sieve and its synthesis method

A technology of ZSM-5 and nanosheets, which is applied in the field of molecular sieve synthesis, can solve problems such as difficult separation and non-magnetic properties of molecular sieves, and achieve the effects of reduced production costs, high yield, and high crystallinity

Inactive Publication Date: 2018-12-07
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the monolithic hierarchical porous ZSM-5 molecular sieve is not magnetic, and as a catalyst, it is difficult to separate in some special liquid phase reactions.

Method used

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  • A kind of superparamagnetic nano sheet structure ZSM-5 molecular sieve and its synthesis method
  • A kind of superparamagnetic nano sheet structure ZSM-5 molecular sieve and its synthesis method
  • A kind of superparamagnetic nano sheet structure ZSM-5 molecular sieve and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Using ethyl orthosilicate (19.936g), tetrapropylammonium hydroxide (34.966g) with a concentration of 20%, and deionized water (5.098g) as starting materials, hydrothermal crystallization at 80°C for 24h, cooling After centrifugation, the crystallized product was taken out and used as a seed crystal gel for subsequent use;

[0040] (2) Potassium hydroxide (0.939g) was dissolved in 36.166g deionized water to form solution A, and the weighed tetrapropylammonium hydroxide (2.039g) and aluminum isopropoxide (0.274g) were added to part A solution (40% of the total mass) was stirred for 2 hours to form a solution B;

[0041] (3) Slowly add an appropriate amount of tetraethyl orthosilicate (5.58g) dropwise into the solution of part A (30% of the total mass) and stir for 2 hours to form solution C;

[0042] (4) Add B to C and stir for 5 hours to form solution D;

[0043] (5) Add cetyltrimethylammonium bromide (0.488g) to part A solution (30% of the total mass), stir for 2h...

Embodiment 2

[0055] (1) Using ethyl orthosilicate (19.936g), tetrapropylammonium hydroxide (34.966g) with a concentration of 20%, and deionized water (5.098g) as starting materials, hydrothermal crystallization at 80°C for 24h, cooling After centrifugation, the crystallized product was taken out and used as a seed crystal gel for subsequent use;

[0056] (2) Potassium hydroxide (0.939g) was dissolved in 36.166g deionized water to form solution A, and the weighed tetrapropylammonium hydroxide (2.039g) and aluminum isopropoxide (0.274g) were added to part A solution (40% of the total mass) was stirred for 2 hours to form a solution B;

[0057] (3) Slowly add an appropriate amount of tetraethyl orthosilicate (5.58g) dropwise into the solution of part A (30% of the total mass) and stir for 2 hours to form solution C;

[0058] (4) Add B to C and stir for 5 hours to form solution D;

[0059] (5) Add dodecyltrimethylammonium bromide (0.413g) into part A solution (30% of the total mass), stir fo...

Embodiment 3

[0063] (1) Using ethyl orthosilicate (19.936g), tetrapropylammonium hydroxide (34.966g) with a concentration of 20%, and deionized water (5.098g) as starting materials, hydrothermal crystallization at 80°C for 24h, cooling After centrifugation, the crystallized product was taken out and used as a seed crystal gel for subsequent use;

[0064] (2) Potassium hydroxide (0.939g) was dissolved in 36.166g deionized water to form solution A, and the weighed tetrapropylammonium hydroxide (2.039g) and aluminum isopropoxide (0.274g) were added to part A solution (40% of the total mass) was stirred for 2 hours to form a solution B;

[0065] (3) Slowly add an appropriate amount of tetraethyl orthosilicate (5.58g) dropwise into the solution of part A (30% of the total mass) and stir for 2 hours to form solution C;

[0066] (4) Add B to C and stir for 5 hours to form solution D;

[0067] (5) Add octadecyltrimethylammonium bromide (0.526g) into part A solution (30% of the total mass), stir ...

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Abstract

The invention discloses a superparamagnetism ZSM-5 molecular sieve with a nanosheet layer structure and a synthesis method thereof; with adopting of a dual-template method for synthesis, tetrapropylammonium hydroxide is used as a micro-pore template agent, an amphiphilic cationic surfactant is used as a structure directing agent, potassium hydroxide or sodium hydroxide is selected 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, then Fe3O4 nano microspheres are added, the mixture is dispersed evenly by ultrasonic treatment and is subjected to hydrothermal crystallization according to a conventional method, and the product is washed, dried and roasted to obtain the ZSM-5 molecular sieve. The molecular sieve is the superparamagnetism ZSM-5 molecular sieve having the nanosheet layer 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 superparamagnetic nano sheet structure ZSM-5 molecular sieve and a synthesis method thereof. Background technique [0002] Mobil Corporation of the United States first reported the synthesis of ZSM-5 molecular sieves in 1972, because of its ordered microporous structure, large specific surface area, high thermal and hydrothermal stability, skeleton acid centers, and exchangeable cations. It has become one of the most widely used catalysts in industry due to its excellent performance. However, the pores of most microporous ZSM-5 molecular sieves are smaller than 1nm, which makes the transport of molecules difficult. For reactions involving macromolecules, the catalyst is often easily inactivated due to surface area carbon or coking to block the pores, which limits its application range. Researchers generally believe that there are three main methods for obtain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/40C01G49/08
CPCC01B39/40C01G49/08C01P2002/72C01P2002/85C01P2004/03C01P2004/04C01P2004/20C01P2004/50C01P2004/80C01P2006/42
Inventor 王政宋智
Owner NINGXIA UNIVERSITY