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ZSM-5 zeolite as well as preparation method and application thereof

A ZSM-5 and zeolite technology, applied in the field of catalyst preparation, can solve the problems of low specific surface area, poor compatibility of semiconductor materials, and limited accessible catalytic sites

Active Publication Date: 2021-11-09
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing zeolite supports have disadvantages such as low specific surface area, limited accessible catalytic sites, and poor compatibility with semiconductor materials.

Method used

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  • ZSM-5 zeolite as well as preparation method and application thereof
  • ZSM-5 zeolite as well as preparation method and application thereof
  • ZSM-5 zeolite as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: Synthesis of ZSM-5 zeolite——tetraethyl orthosilicate as silicon source

[0052] A preparation method of ZSM-5 zeolite, comprising the following steps S1~S2:

[0053] S1 step comprises: S11: 0.16g tri-sec-butoxide aluminum (C 12 h 27 AlO 3 , the molecular weight is 246, the purity (mass percentage) 97%) and 6.97g of tetraethyl orthosilicate (C 8 h 20 o 4 Si, molecular weight is 208) and mix uniformly as aluminum source and silicon source stock solution; S12: 5g TPAOH (the TPAOH aqueous solution of mass percentage concentration 40%) and 0.9255g phenol are dissolved in 56g deionized water, keep stirring until forming a solution; S13 : The stock solution prepared in S11 was slowly added to the solution prepared in S12 while stirring, and mixed evenly to obtain a synthetic solution; S2: at room temperature, the synthetic solution was aged for 2 days. After the aging, the synthetic solution was Placed in a 100mL polytetrafluoroethylene-lined stainless stee...

Embodiment 2

[0054] Example 2 Synthesis of ZSM-5 zeolite - sodium silicate as silicon source

[0055] A preparation method of ZSM-5 zeolite, comprising the following steps:

[0056] Step S1 includes: S11: Add Al to deionized water under continuous stirring 2 (SO 4 ) 3 0.45g, 5gTPAOH (the TPAOH aqueous solution of mass percent concentration 40%) and 0.62g phenol, until they dissolve completely; 2 SiO 3 (with SiO 2 26.5% by mass, containing Na 2 (10.6% by mass percentage) solution is slowly added to the solution of S11 to form a synthetic solution; S2: at room temperature, the synthetic solution is aged for 2 days, and after the aging is completed, the synthetic solution is placed in 100 mL of polytetrafluoroethylene-lined stainless steel In an autoclave, and the polytetrafluoroethylene-lined stainless steel autoclave is heated in a rotary oven, the oven speed is 30rpm, and crystallized at 170°C for 72h. After the reaction, the product is centrifugally washed three times and dried at...

Embodiment 3

[0058] A preparation method of ZSM-5 zeolite, comprising the following steps S1~S2:

[0059] S1 step comprises: S11: 0.16g tri-sec-butoxide aluminum (C 12 h 27 AlO 3 , the molecular weight is 246, the purity (mass percentage) 97%) and 6.97g of tetraethyl orthosilicate (C 8 h 20 o 4 Si, the molecular weight is 208) mixed uniformly as aluminum source and silicon source stock solution; S12: 5g TPAOH (the TPAOH aqueous solution of mass percent concentration 40%) and 0.58g alanine are dissolved in 56g deionized water, keep stirring until forming a solution ; S13: Slowly add the stock solution prepared in S11 to the solution prepared in S12 above while stirring, and mix evenly to obtain a synthetic solution; S2: Aging the synthetic solution for 2 days at room temperature. The synthetic solution was placed in a 100mL polytetrafluoroethylene-lined stainless steel autoclave, and the polytetrafluoroethylene-lined stainless steel autoclave was heated in a rotary oven with a rotation...

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Abstract

The invention provides ZSM-5 zeolite and a preparation method thereof, and provides application of the ZSM-5 zeolite as a chemical reaction catalyst or a catalyst carrier. The raw materials used in the invention are simple, cheap and easily available, have good compatibility with zeolite crystals, do not destroy the zeolite crystals, can flexibly regulate and control the zeolite crystallization process, change the zeolite crystallization behavior, improve the zeolite crystallinity, improve the silica-alumina ratio of the framework, reduce the framework defects, improve the activity and stability of a catalyst, and are beneficial to catalytic reaction. The preparation process is simple and beneficial to industrial large-scale production. In addition, the ZSM-5 zeolite prepared by the method can also be used as a carrier material of a semiconductor composite material catalyst, has extremely high compatibility, and improves the photocatalytic reaction efficiency of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a ZSM-5 zeolite and its preparation method and application. Background technique [0002] ZSM-5 zeolite catalyst is a catalyst for catalyzing the reaction of methanol to propylene. However, due to the small pore size of natural microporous ZSM-5 zeolite, it is not conducive to the diffusion of macromolecules, and has serious diffusion limitation problems. At the same time, its intrinsic structure catalyzes The performance is poor, so it is necessary to optimize and improve the structure of zeolite. [0003] Because zeolite materials have great application potential in the fields of energy and health, it is particularly important to rationally design and synthesize zeolite molecular sieves with target structures and properties. Although researchers have invested great efforts in the controllable preparation of zeolites, including adjusting crystallization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40B01J29/40B01J32/00C07C1/20C07C11/06
CPCC01B39/40B01J29/40B01J29/405C07C1/20C07C2529/40B01J2229/186C01P2004/32C01P2006/16C01P2002/72C01P2004/03C01P2004/04C01P2002/82C01P2002/86B01J35/39C07C11/06Y02P20/52
Inventor 杨世和洪梅董磊
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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