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Preparation method and application of hierarchical-pore HZSM-5 molecular sieve

A technology of ZSM-5 and molecular sieve, which is applied in molecular sieve catalysts, chemical instruments and methods, and the production of hydrocarbons from oxygen-containing organic compounds, etc., can solve the problems of reduced yield of aromatics, coking of catalyst active centers, and difficulty in entering macromolecular substances. Achieve the effects of increased aromatics yield, reduced coke yield, and less defects

Inactive Publication Date: 2017-09-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing HZSM-5 molecular sieve will produce a lot of macromolecular substances in the process of catalytic pyrolysis of biomass, and it is difficult for macromolecular substances to enter the smaller micropore channels, which inhibits the mass transfer of macromolecular reactants and products, resulting in Carbon deposition and coking in the active center of the catalyst reduces the yield of aromatics

Method used

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  • Preparation method and application of hierarchical-pore HZSM-5 molecular sieve
  • Preparation method and application of hierarchical-pore HZSM-5 molecular sieve
  • Preparation method and application of hierarchical-pore HZSM-5 molecular sieve

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Effect test

Embodiment 1

[0043] 1. Catalyst preparation:

[0044] Dissolve 0.18g of sodium metaaluminate and 4.88g of tetrapropylammonium hydroxide (25% aqueous solution) in 13.5g of water, then dropwise add 6.25g of tetraethyl orthosilicate, mix and prepare a molecular sieve precursor at room temperature, and stir 3h, then pre-crystallized at 90°C under stirring and reflux for 24h, then added 0.13g sucrose, continued to stir for 4h, and then transferred the resulting mixture into a stainless steel reactor with a polytetrafluoroethylene lining , sealed, and hydrothermally crystallized at 170°C for 3 days. After the crystallization, the reaction mixture was separated from solid and liquid, washed thoroughly with deionized water, and the separated solid was dried at 110°C for 12h, and finally placed in a muffle furnace at 550°C Medium calcination for 6 hours to obtain a hierarchically porous ZSM-5 molecular sieve.

[0045]According to the proportion of 1g molecular sieve sample: 50ml of 1mol / l ammonium...

Embodiment 2

[0049] Referring to Example 1, only the amount of sucrose added was changed to 0.26 g, and other conditions remained unchanged, to obtain a hierarchically porous HZSM-5 molecular sieve, which was denoted as HZ (C / Si=0.3).

[0050] The yield of aromatics and coke of the hierarchically porous HZSM-5 molecular sieve prepared in this example catalyzed pyrolysis of cellulose was 38.9% and 27.2%.

Embodiment 3

[0052] With reference to Example 1, only the amount of sodium metaaluminate was changed to 0.12g, and other conditions were unchanged, to obtain a hierarchically porous HZSM-5 molecular sieve, which was denoted as HZ(SiO 2 / Al 2 o 3 =20).

[0053] The yield of aromatics and coke of the hierarchically porous HZSM-5 molecular sieve prepared in this example catalyzed pyrolysis of cellulose was 34.8% and 30.2%.

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Abstract

The invention relates to a preparation method and application of a hierarchical-pore HZSM-5 molecular sieve. The preparation method includes following steps: 1), dissolving an aluminum source in water, adding a tetrapropyl ammonium hydroxide solution, adding a silicon source, and mixing to obtain a molecular sieve precursor; 2), pre-crystallizing the molecular sieve precursor; 3), adding sucrose into the molecular sieve precursor after being pre-crystallized, and mixing for hydrothermal crystallizing reaction; 4), after crystallizing reaction is completed, separating, washing, drying and roasting to obtain a hierarchical-pore ZSM-5 molecular sieve; 5), subjecting the hierarchical-pore ZSM-5 molecular sieve and an ammonium salt solution to ion exchange, separating, washing, drying and roasting to obtain the hierarchical-pore HZSM-5 molecular sieve. The hierarchical-pore HZSM-5 molecular sieve prepared by the method can improve aromatization ability and anti-coking ability of the same in the process of biomass catalytic pyrolysis.

Description

technical field [0001] The invention belongs to the technical field of biomass energy utilization, and in particular relates to a preparation method and application of a multi-stage pore HZSM-5 molecular sieve. Background technique [0002] At present, the production of aromatics at home and abroad mainly relies on petroleum resources. Under the conditions of catalysts and high temperature and high pressure, benzene, toluene, and xylene are obtained through hydrogenation, reforming, aromatics conversion, and separation. The process is complicated, and a large amount of waste gas is emitted, polluting the environment . With the increasing scarcity of fossil resources and the increasing demand for aromatics in the market, the traditional petroleum production of aromatics is facing severe challenges, and the development of green and environment-friendly aromatics production technology has gradually attracted attention. [0003] Biomass sources are extensive and renewable. Acco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40B01J29/40C07C1/20C07C15/04C07C15/06C07C15/08
CPCY02P20/52C01B39/40B01J29/40C01P2002/72C01P2004/03C01P2004/04C01P2006/12C01P2006/14C01P2006/17C07C1/20C07C15/04C07C15/06C07C15/08
Inventor 傅杰时旭周峰吕秀阳黄和欧阳平凯
Owner ZHEJIANG UNIV
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