HZSM-5 molecular sieve with core-shell structure for methanol-to-aromatic hydrocarbon reaction and preparation method thereof

A ZSM-5, core-shell structure technology, applied in the field of methanol to aromatic hydrocarbon catalysis, can solve the problems of complex reactor structure, increase the reactor scale, waste of manpower and material resources, etc., to strengthen the reaction depth and coupling degree, improve catalytic performance, The effect of improving the response performance

Active Publication Date: 2020-04-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation process requires multiple reactors, the structure of the reactor is complex, the scale of the reactor is increased, the basic investment is large, and the operation cost is high, resulting in a serious waste of manpower and material resources

Method used

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  • HZSM-5 molecular sieve with core-shell structure for methanol-to-aromatic hydrocarbon reaction and preparation method thereof
  • HZSM-5 molecular sieve with core-shell structure for methanol-to-aromatic hydrocarbon reaction and preparation method thereof
  • HZSM-5 molecular sieve with core-shell structure for methanol-to-aromatic hydrocarbon reaction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Nucleosynthesis process

[0025] The aluminum source sodium metaaluminate (NaAlO 2 ) was dissolved in a certain amount of deionized water, the template agent tetrapropylammonium hydroxide (TPAOH) was added, and tetrapropylammonium hydroxide (TPAOH) was added dropwise with a peristaltic pump 2 Finally, a certain mass of metal species Zn was added, and after fully stirring evenly, aging was carried out in a water bath at 25 °C for 24 h. The final molar composition of each raw material was: 9 TPAOH: 25 SiO 2 : 400H 2 O: 0.42Al 2 o 3：0.12 Zn. Finally, transfer the uniformly stirred feed solution into a crystallization kettle, and rotate and crystallize at 80°C for 3 days, and finally put the obtained nuclear solution into a polytetrafluoroethylene bottle for later use.

[0026] (2) Shell construction process

[0027] A certain quality of aluminum sulfate (Al 2 SO 4 18H 2 O) dissolved in sodium hydroxide solution, then added silica sol for mixing, and finally ad...

Embodiment 2

[0031] (1) Nucleosynthesis process

[0032] The aluminum source sodium metaaluminate (NaAlO 2 ) was dissolved in a certain amount of deionized water, the template agent tetrapropylammonium hydroxide (TPAOH) was added, and tetrapropylammonium hydroxide (TPAOH) was added dropwise with a peristaltic pump 2 Finally, a certain mass of metal species Ga was added, and after fully stirring evenly, it was aged in a water bath at 50°C and stirred for 18 h. The final molar composition of each raw material was: 6TPAOH: 25 SiO 2 : 250H 2 O: 0.42Al 2 o 3 : 1.12 Ga. Finally, transfer the uniformly stirred material liquid into a crystallization kettle, rotate and crystallize at 120°C for 2 days, and finally put the obtained nuclear solution into a polytetrafluoroethylene bottle for later use.

[0033] (2) Shell construction process

[0034] A certain quality of aluminum sulfate (Al 2 SO 4 18H 2 O) Dissolved in sodium hydroxide solution, then added silica sol for mixing, and finally a...

Embodiment 3

[0038] (1) Nucleosynthesis process

[0039] The aluminum source sodium metaaluminate (NaAlO 2 ) was dissolved in a certain amount of deionized water, the template agent tetrapropylammonium hydroxide (TPAOH) was added, and tetrapropylammonium hydroxide (TPAOH) was added dropwise with a peristaltic pump 2 In the end, a certain amount of metal species Ga was added, and after stirring well, aging was carried out in a water bath for 50 o C under stirring for 36 h, the final molar composition of each raw material is: 6TPAOH: 25 SiO 2 : 1000H 2 O: 0.25 Al 2 o 3 : 0.67 Ga. Finally, transfer the uniformly stirred material liquid into a crystallization kettle, rotate and crystallize at 120°C for 2 days, and finally put the obtained nuclear solution into a polytetrafluoroethylene bottle for later use.

[0040] (2) Shell construction process

[0041] A certain quality of aluminum sulfate (Al 2 SO 4 18H 2 O) dissolved in sodium hydroxide solution, then added silica sol for mixing...

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Abstract

The invention relates to an HZSM-5 molecular sieve with a core-shell structure for a methanol-to-aromatic hydrocarbon reaction and a preparation method thereof. The shell layer of the catalyst is a ZSM-5 molecular sieve with a high silica-alumina ratio for catalyzing the reaction of preparing low-carbon olefin from methanol, and the core part of the catalyst is low silica-alumina ratio MZSM-5 loaded with a metal species M, so that the reaction process of further aromatizing the low-carbon olefin generated from the shell layer into aromatic hydrocarbon is realized. By adopting the ZSM-5 catalyst with the core-shell structure disclosed by the invention, coupling of two reaction processes of preparing low-carbon olefin from methanol and preparing aromatic hydrocarbon from low-carbon olefin can be realized on one catalyst, and the aromatic hydrocarbon is obtained with high selectivity.

Description

technical field [0001] The invention belongs to the technical field of methanol-to-aromatics catalysis, and in particular relates to a core-shell structure HZSM-5 molecular sieve for methanol-to-aromatics reaction and a preparation method thereof. Background technique [0002] As an important organic chemical raw material, aromatic hydrocarbons are widely used in pesticides, dyes, organic materials and other fields. About 95% of my country's aromatics production comes from petrochemicals, mainly through petroleum-based production and supply such as catalytic reforming and cracking processes in refineries. With the gradual shortage of petroleum resources, the supply gap of aromatics is bound to increase. With the development of coal chemical industry, coal-based methanol synthesis and conversion technology is becoming more and more mature, methanol production is increasing year by year, and then there is a serious problem of methanol overcapacity. In view of the current incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/46B01J35/02C07C1/20C07C11/02C07C2/12C07C15/02
CPCB01J29/40B01J29/405B01J29/46B01J35/008B01J35/023B01J35/006C07C1/20C07C2/12C07C11/02C07C15/02Y02P20/52
Inventor 付廷俊李忠邵娟
Owner TAIYUAN UNIV OF TECH
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