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A kind of composite catalyst and its preparation method and application

A technology of composite catalyst and hydrogenation reaction, which is applied in the direction of catalytic reaction, carbon-based compound preparation, chemical instruments and methods, etc., can solve the problems of low metal utilization rate, poor reaction selectivity, low metal utilization rate, etc., and increase the load Stability, improved hydrogenation selectivity, and high metal utilization

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these polymer supports require complex modification methods, and the ion exchange method leads to low utilization of metals
[0005] In summary, there are some problems in the preparation and recovery process of the existing hydrogenation catalysts that do not meet the requirements of green technology, and the shortcomings of high energy consumption, cumbersome preparation process, low metal utilization rate and poor reaction selectivity need to be improved.

Method used

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  • A kind of composite catalyst and its preparation method and application
  • A kind of composite catalyst and its preparation method and application
  • A kind of composite catalyst and its preparation method and application

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preparation example Construction

[0028] A second aspect of the present invention provides a preparation method of the above-mentioned composite catalyst, the preparation method comprising the following steps:

[0029] a. Dissolve or disperse the polymer matrix in C 1 -C 4 In the low-carbon alcohol of , obtain the first solution;

[0030] b. Dissolve polybasic acid in C 1 -C 4 In the low-carbon alcohol of , obtain the second solution;

[0031] c. Under stirring, the second solution is added dropwise to the first solution to generate the first precipitation;

[0032] D, the first precipitation produced in step c is separated, obtains solid substance;

[0033] e. Dissolve the salt of the metal active component in C 1 -C 4 In the low-carbon alcohol, the third solution is obtained;

[0034] f, the solid matter obtained in step d is redispersed in C 1 -C 4 In the low-carbon alcohol, the fourth solution is obtained; in a state of stirring, the third solution is added dropwise to the fourth solution to prod...

Embodiment 1

[0047] (1) 20 mmol (1.88 g) of polyvinylimidazole (PVIM) was weighed and dissolved in 200 mL of methanol, and 50 mL of methanol solution with a sulfuric acid concentration of 0.1 mmol / mL was added dropwise under stirring, and a solid substance was immediately produced in the solution. After the dropwise addition was completed, stirring was maintained for 4h. Finally, through vacuum filtration and methanol washing 3 times, the sulfuric acid-polyvinylimidazole complex (H 2 SO 4 -PVIM).

[0048] (2) The H obtained above was 2 SO 4 -PVIM was dispersed in methanol at a concentration of 0.1 g / mL. 10 mL of a methanol solution of palladium nitrate with a palladium concentration of 0.05 mmol / mL was added dropwise with stirring. After the dropwise addition was completed, stirring was maintained for 4 h. Finally, after vacuum filtration and washing with methanol for 3 times, drying at 80 °C for 8 h to obtain a palladium-sulfuric acid-polyvinylimidazole composite catalyst (Pd-H 2 S...

Embodiment 2

[0052] (1) 20 mmol (1.88 g) of polyvinylimidazole (PVIM) was weighed and dissolved in 200 mL of methanol, and 50 mL of methanol solution with a sulfuric acid concentration of 0.1 mmol / mL was added dropwise under stirring, and a solid substance was immediately produced in the solution. After the dropwise addition was completed, stirring was maintained for 4h. Finally, through vacuum filtration and methanol washing 3 times, the sulfuric acid-polyvinylimidazole complex (H 2 SO 4 -PVIM).

[0053] (2) The H obtained above was 2 SO 4 -PVIM was dispersed in methanol at a concentration of 0.1 g / mL. Take 0.4mL of palladium nitrate methanol solution containing palladium concentration of 0.05mmol / mL, dilute to 20mL with methanol, and add H dropwise under stirring conditions 2 SO 4 -PVIM in methanol. After the dropwise addition was completed, stirring was maintained for 4 h. Finally, after vacuum filtration and washing with methanol for 3 times, drying at 80 °C for 8 h to obtain a...

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Abstract

The invention belongs to the field of catalysts, and relates to a composite hydrogenation catalyst and a preparation method and application thereof. The composite catalyst comprises a polymer matrix cross-linked by a polybasic acid and a metal active component, the polymer matrix is ​​a polymer containing a nitrogen-containing heterocyclic side group, and the nitrogen atom in the nitrogen-containing heterocyclic side group has A lone pair of electrons, at least a part of the metal active component forms a coordination bond with the lone pair of electrons of the nitrogen atom. The composite catalyst of the invention has the advantages of simple preparation method, low energy consumption, high metal utilization rate and good selectivity when used in hydrogenation reaction.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a composite hydrogenation catalyst and a preparation method and application thereof. Background technique [0002] As a basic reduction reaction, hydrogenation reaction occupies an extremely important position in chemical production. The functional groups involved in the hydrogenation mainly include nitro, carbonyl, ester, carbon-carbon double bonds and carbon-carbon triple bonds, etc. The hydrogenation of these functional groups needs to be realized under the action of catalysts. Therefore, the development of hydrogenation catalysts has always been a hot spot of industrial research. [0003] Most of the traditional hydrogenation catalysts use transition metals such as nickel, molybdenum, cobalt, ruthenium, palladium, platinum and other transition metals as hydrogenation active components, and porous inorganic substances as carriers, such as alumina, silica, molecular sieves...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22C07F15/00C07F15/04C07F15/06C07F3/06C07C45/62C07C49/04
CPCB01J31/1805C07F15/0066C07F15/0053C07F15/045C07F15/065C07F3/003C07C45/62B01J2531/26B01J2531/821B01J2531/824B01J2531/845B01J2531/847B01J2231/645C07C49/04Y02P20/584
Inventor 陈勇鲁树亮吴佳佳郝雪松徐洋
Owner CHINA PETROLEUM & CHEM CORP
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