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A method for regulating the acidity of a coal tar hydrogenation catalyst carrier

A technology of hydrogenation catalyst and catalyst carrier, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of affecting pore structure, interaction between active components and carriers, excessive coke formation, deposition, etc. , to avoid the shrinkage and collapse of the pore channel, to achieve the effect of many types, and the degree of dispersion is suppressed.

Active Publication Date: 2017-06-09
BEIJING HUAFU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have the following problems: the surface acidity of the catalyst is adjusted by impregnating and loading other elements, and the modifying elements are deposited on the inner and outer surfaces of the carrier, which affects the pore structure and the interaction between the active component and the carrier.
However, if the rare earth content in the catalyst is too much, the density of the acidic center will be higher, the ability of hydrogen transfer reaction will be stronger, and more coke will be formed.

Method used

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  • A method for regulating the acidity of a coal tar hydrogenation catalyst carrier
  • A method for regulating the acidity of a coal tar hydrogenation catalyst carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 Catalyst carrier regulates and controls the method for strong acidity

[0024] Obtain a catalyst carrier with strong acidity by adopting the above-mentioned control method, the steps are as follows:

[0025] (1) Weigh 20g of alumina precursor pseudo-boehmite, NH 4 20g of Y-type molecular sieve and 6g of pyrolysis method carbon black in N900 medium particle (particle diameter is 201~500nm), mix evenly;

[0026] (2) Weigh 15 g of tetrabutyl titanate in proportion, and drop it into the solid mixture described in step (1), to obtain system 1;

[0027] (3) Weigh 6 g of cosolvent dilute nitric acid, 2 g of acidic ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate and 4 g of liquid pore-enlarging agent polyvinyl alcohol, and mix uniformly to obtain system 2. System 2 is dropped into system 1;

[0028] (4) The mixture obtained in step (3) was first dried at 60°C for 6 hours, and then calcined at 700°C for 4 hours to obtain a strongly acidic catalyst carr...

Embodiment 2

[0033] Embodiment 2 A kind of regulation and control method of catalyst carrier acidity

[0034] Obtain a catalyst carrier with strong acidity by adopting the above-mentioned control method, the steps are as follows:

[0035] (1) Weigh 24g of alumina precursor boehmite, 15g of USY molecular sieve and 6g of N500 medium particle pyrolysis carbon black (particle size is 40-48nm), and mix evenly;

[0036] (2) Weigh 13 g of tetraisopropyl titanate in proportion, and drop it into the solid mixture described in step (1), to obtain system 1;

[0037] (3) Weigh 7 g of cosolvent dilute nitric acid, 1.5 g of alkaline ionic liquid 1-methyl-3-ethylimidazolium dicyanamide salt, and 3 g of liquid pore-enlarging agent polyethylene glycol, and mix them uniformly to obtain system 2 , drop system 2 into system 1;

[0038] (4) The mixture obtained in step (3) was dried at 100° C. for 4 hours and calcined at 750° C. for 2 hours to obtain a catalyst carrier.

[0039] At the same time, the same m...

Embodiment 3

[0042] Embodiment 3 A kind of control method of catalyst carrier acidity

[0043] Obtain a catalyst carrier with strong acidity by adopting the above-mentioned control method, the steps are as follows:

[0044] (1) Weigh 32g of alumina precursor aluminum hydroxide powder, 24g of Y-type molecular sieve and starch (5-33μm) and mix evenly;

[0045] (2) Weigh 8.5 g each of ethyl titanate and tetrabutyl titanate in proportion, and drop them into the solid mixture described in step (1) to obtain system 1;

[0046] (3) Weigh 10 g of cosolvent dilute phosphoric acid, 1.4 g of acidic ionic liquid 1-allyl-3-picoline hydrogen phosphate and 5 g of liquid pore-enlarging agent polyethylene oxide, and mix uniformly to obtain system 2, Drop system 2 into system 1;

[0047] (4) The mixture obtained in step (3) was dried at 120° C. for 4 hours and calcined at 550° C. for 4 hours to obtain a catalyst carrier.

[0048] At the same time, the same method as in Example 3 was used to prepare a cat...

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Abstract

The invention relates to a method for controlling the acidity of a coal tar hydrogenation catalyst carrier. During the preparation process of the catalyst carrier, an ionic liquid is added, dried and roasted; wherein, the catalyst carrier is made of an alumina precursor, a titanium source , Molecular sieve, co-solvent, and pore-enlarging agent are prepared from raw materials. By adjusting the acid strength and acid distribution of the catalyst carrier, it is not easy to coke during the hydrogenation process, prolonging the service life of the catalyst and significantly increasing the yield of light oil.

Description

technical field [0001] The invention relates to a method for regulating the acidity of a coal tar hydrogenation catalyst carrier, and belongs to the technical field of preparation of coal chemical catalysts. Background technique [0002] Coal tar contains a large amount of condensed ring aromatics, unsaturated olefins and phenolic compounds, which are very easy to condense and coke under heated conditions. Therefore, conventional coal tar hydrogenation catalysts are more likely to be coked and deactivated during the reaction process, resulting in shortened operating cycles of the unit. . The reason is that a hydrogen transfer reaction occurs during the catalytic hydrogenation process, and the occurrence of this reaction is related to the strength and density of the acid center of the catalyst support; in addition, the acidity of the catalyst surface can also greatly affect the distribution of catalytic cracking products , so adjusting the strength and density of the acid ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/08B01J29/16C10G47/16C10G47/20
Inventor 余海鹏史雪君车中山吴道洪
Owner BEIJING HUAFU ENG