A preparation method of gallium-containing zeolite and its application in coal pyrolysis volatile modification

A technology of zeolite and gallium source, which is applied in the field of preparation of gallium-containing zeolite to achieve the effects of reducing carbon deposition and deactivation, easy operation and mild conditions

Active Publication Date: 2022-03-15
NORTHWEST UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no literature and patent reports on the application of gallium-containing zeolite in coal pyrolysis volatile modification

Method used

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  • A preparation method of gallium-containing zeolite and its application in coal pyrolysis volatile modification
  • A preparation method of gallium-containing zeolite and its application in coal pyrolysis volatile modification
  • A preparation method of gallium-containing zeolite and its application in coal pyrolysis volatile modification

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Effect test

Embodiment 1

[0062] (1) Under stirring conditions, first take 10.58g TPAOH and 0.233mL 10mol / L NaOH solution and add it to 10.81g water, then add 1.97g TPOAC to form a transparent solution A;

[0063] (2) Add 12.5g of LUDOX HS-40 dropwise to solution A, stir for 1 hour after dropping, add 0.21g of gallium nitrate hydrate and 0.35g of aluminum isopropoxide, and then stir for 0.5h for aging;

[0064] (3) Transfer the solution obtained in step (2) from aging at room temperature to a stainless steel reaction kettle lined with polytetrafluoroethylene, crystallize at 140°C for 4 days, filter and wash with suction, dry at 105°C, and then roast at 550°C 6h;

[0065] (4) The solid obtained in step (3) is subjected to ammonium nitrate ion exchange, washed three times, dried, and then roasted at 550° C. for 6 hours to obtain a hierarchically porous micron-scale gallium-containing framework molecular sieve with an MFI framework structure.

[0066] see Figure 5 , the molecular sieve prepared by this...

Embodiment 2

[0068] (1) Under stirring conditions, first take 10.58g TPAOH and 0.233mL 10mol / L NaOH solution and add it to 10.81g water, then add 1.97g TPOAC to form a transparent solution A;

[0069] (2) Add 12.5g of LUDOX HS-40 dropwise to A, stir for 1 hour, then add 0.21g of gallium nitrate hydrate and 0.087g of aluminum isopropoxide, and stir for 0.5 hours;

[0070] (3) Transfer the solution obtained in step (2) from aging at room temperature to a stainless steel reaction kettle lined with polytetrafluoroethylene, crystallize at 140°C for 4 days, filter and wash with suction, dry at 105°C, and then roast at 550°C 6h;

[0071] (4) The solid obtained in step (3) was ion-exchanged with ammonium nitrate, washed three times, dried, and then calcined at 550° C. for 6 hours to obtain a hierarchically porous micron-scale framework-containing gallium-aluminum molecular sieve with an MFI framework structure.

[0072] see Image 6 , the molecular sieve prepared by this method can also observe ...

Embodiment 3

[0074] (1) Under stirring conditions, first take 10.58g TPAOH and 0.233mL 10mol / L NaOH solution and add it to 10.81g water, then add 1.97g TPOAC to form a transparent solution A;

[0075] (2) Add 12.5g of LUDOX HS-40 dropwise to A, stir for 1h, then add 0.21g of gallium nitrate hydrate and 0,17g of aluminum isopropoxide, and stir for 0.5h;

[0076] (3) Transfer the solution obtained in step (2) from aging at room temperature to a stainless steel reaction kettle lined with polytetrafluoroethylene, crystallize at 140°C for 4 days, filter and wash with suction, dry at 105°C, and then roast at 550°C 6h;

[0077] (4) The solid obtained in step (3) was ion-exchanged with ammonium nitrate, washed three times, dried, and then calcined at 550° C. for 6 hours to obtain a hierarchically porous micron-scale framework-containing gallium-aluminum molecular sieve with an MFI framework structure.

[0078] see Figure 7 The molecular sieve synthesized by this method can also observe obvious ...

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Abstract

A preparation method of gallium-containing zeolite and its application in coal pyrolysis volatilization modification. Water, microporous template agent, NaOH and mesoporous template agent are made into a solution, and silicon source is added drop by drop, and stirred after dropping After the silicon source is hydrolyzed and dispersed, the gallium source and the aluminum source are added, and after aging, it is crystallized at 100-180°C for 2-6 days. After crystallization and roasting, ammonium nitrate ion exchange is performed, and then roasted after drying to obtain a multi-level MFI skeleton. Porous gallium-containing zeolite; the gallium-containing zeolite of the present invention can reduce the carbon deposition and deactivation of the catalyst to a certain extent; for various substances contained in coal pyrolysis volatiles, the weak acid sites formed by the framework gallium and the extra-framework gallium can be combined with molecular sieves Si‑OH‑Al (strong B acid site) can promote the dehydrogenation, cracking, oligomerization and aromatization of macroalkanes, and the formed olefins can be 2 o 3 Activation of CH under the action of 4 , to promote the conversion of methane to long-chain olefins and aromatics.

Description

technical field [0001] The invention relates to a preparation method of gallium-containing zeolite and its application in coal pyrolysis volatile modification. Background technique [0002] Coal occupies a dominant position in my country's energy structure, accounting for about 70% of primary energy production and consumption. The clean and efficient utilization of coal is the focus of coal chemical technology. Coal pyrolysis process is to extract the hydrogen-rich components in coal in the form of liquid or gas under anaerobic conditions before coal gasification, combustion or other methods of utilization. The liquid product obtained from coal pyrolysis, that is, coal tar, is an important chemical raw material. Coal tar contains a large amount of aromatic hydrocarbons, phenols and other compounds. It can be used as a raw material for fine chemicals and new chemical materials, and has a very high economical value. value. However, the quality of tar in the traditional pyrol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/06C10C1/20
CPCC10C1/20C01B39/065C01P2004/03C01P2004/62C01P2004/61
Inventor 陈汇勇毕晨瑶王晓宵尤晴王旭张建波郝青青马晓迅
Owner NORTHWEST UNIV
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