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Alkali-modified ZSM-5 molecular sieve, preparation method and application thereof

A ZSM-5 and molecular sieve technology, applied in the field of molecular sieves, can solve the problems of reducing catalytic activity and destroying molecular sieves, and achieve the effects of low micropore ratio, increasing solid content, and controlling grain size

Inactive Publication Date: 2018-04-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the reported literature and patents about the alkali treatment of ZSM-5 zeolite mainly aim to use alkali to destroy part of the microporous structure of ZSM-5 zeolite to create multi-level channels, increase the specific surface area of ​​the channels, and expand the pore size of ZSM-5 zeolite To improve the internal diffusion of substances in zeolite crystals, so as to achieve the purpose of improving catalytic performance, but traditional inorganic bases will destroy the crystal structure of molecular sieves while expanding pores, which will seriously reduce catalytic activity, so it is an urgent problem to be solved

Method used

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  • Alkali-modified ZSM-5 molecular sieve, preparation method and application thereof
  • Alkali-modified ZSM-5 molecular sieve, preparation method and application thereof
  • Alkali-modified ZSM-5 molecular sieve, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Take 53ml of deionized water and put it in a beaker, add 0.5106g of aluminum isopropoxide and stir for 10min to obtain solution A. Get 22.3ml tetraethyl orthosilicate, add in the solution A with 1.0ml / min speed, add 22g tetrapropyl ammonium hydroxide then, obtain solution B. Solution B was stirred at room temperature for 5h, and alcohol was removed at 80°C for 3h to a transparent solution. Put the transparent solution into an autoclave, crystallize at 170 degrees for 72 hours, take it out, wash and dry it, and roast it in an air atmosphere at 550 degrees for 6 hours to obtain nano ZSM-5 molecular sieves.

[0057] Take 5g of molecular sieves and place them in a beaker, take 50ml of 0.67mol / L tetrapropylammonium hydroxide solution, add it into the beaker at a rate of 5.0ml / min, and stir at room temperature for 1h to obtain solution C. Solution C was put into a crystallization kettle, and stood at 170°C for 48 hours, taken out, washed and dried, and then roasted in an air...

Embodiment 2

[0059] Take 53ml of deionized water and put it in a beaker, add 0.5106g of aluminum isopropoxide and stir for 10min to obtain solution A. Get 22.3ml tetraethyl orthosilicate, add in the solution A with 1.0ml / min speed, add 22g tetrapropyl ammonium hydroxide then, obtain solution B. Solution B was stirred at room temperature for 5h, and alcohol was removed at 80°C for 2h to a transparent solution. Put the transparent solution into an autoclave, crystallize at 170 degrees for 72 hours, take it out, wash and dry it, and roast it in an air atmosphere at 550 degrees for 6 hours to obtain nano ZSM-5 molecular sieves.

[0060] Put 5g of molecular sieves in a beaker, take 50ml of 1.0mol / L tetrapropylammonium hydroxide solution, add it into the beaker at a rate of 5.0ml / min, and stir at room temperature for 1h to obtain solution C. Solution C was put into a crystallization kettle, and stood at 170°C for 48 hours, taken out, washed and dried, and then roasted in an air atmosphere at 55...

Embodiment 3

[0062] Take 53ml of deionized water and put it in a beaker, add 0.5106g of aluminum isopropoxide and stir for 10min to obtain solution A. Get 22.3ml tetraethyl orthosilicate, add in the solution A with 1.0ml / min speed, add 22g tetrapropyl ammonium hydroxide then, obtain solution B. Solution B was stirred at room temperature for 4h, and alcohol was removed at 80°C for 3h to a transparent solution. Put the transparent solution into an autoclave, crystallize at 170 degrees for 72 hours, take it out, wash and dry it, and roast it in an air atmosphere at 550 degrees for 6 hours to obtain nano ZSM-5 molecular sieves.

[0063] Take 5g of molecular sieves and place them in a beaker, take 50ml of 2.0mol / L tetrapropylammonium hydroxide solution, add it into the beaker at a rate of 5.0ml / min, and stir at room temperature for 1h to obtain solution C. Solution C was put into a crystallization kettle, and stood at 170°C for 48 hours, taken out, washed and dried, and then roasted in an air ...

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Abstract

The invention relates to a preparation method of an alkali-modified ZSM-5 molecular sieve, which includes the steps of: mixing ZSM-5 molecular sieve with an alkali solution, performing a reaction andperforming post-treatment, wherein the reaction is carried out at 150-200 DEG C. The invention also relates to an application of the alkali-modified ZSM-5 molecular sieve in an aromatization reactionof hexene. The alkali-modified ZSM-5 molecular sieve is low in micropore ratio, wherein the micropores are enlarged into the range of mesopores and macropores (5-110 nm); the molecular sieve also is higher in crystalline degree, can effectively delay deactivation due to coking, thus increasing service life of a catalyst; without damage on the appearance of the ZSM-5 molecular sieve, grain size canbe controlled and acidity of the ZSM-5 molecular sieve can be regulated; in addition, pore structure in the molecular sieve is regulated, so that catalytic performance and service life of the catalyst are improved.

Description

technical field [0001] The invention belongs to the field of molecular sieves, relates to an alkali-modified ZSM-5 molecular sieve, in particular to a preparation method of an alkali-modified ZSM-5 molecular sieve, and also relates to an alkali-modified ZSM-5 molecular sieve in hexene aromatization system application. Background technique [0002] Olefin is one of the most important high-octane components of motor gasoline, but when its content is high, it is easy to form varnish-like deposits on engine intake valves and nozzles, resulting in uneven atomization of gasoline and poor combustion performance. become worse, and pollutants increase. Therefore, the problem of not only reducing the olefin content in gasoline, but also maintaining or increasing the octane number of gasoline is faced. In view of the current situation of my country's refining and chemical industry, for quite a long time, automotive gasoline will always be dominated by FCC gasoline with low aromatics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C5/41C07C15/02C01B39/40
CPCB01J29/40B01J2229/14C01B39/40C01P2002/72C01P2004/03C01P2004/04C01P2004/62C01P2006/17C07C5/41C07C15/02
Inventor 刘熠斌朱超冯翔王婷陈小博杨朝合
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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