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A hydrogenation catalyst, its preparation method and application, and a method for hydrogenation reaction of phenols

A hydrogenation catalyst and hydrogenation reaction technology, applied in hydrogenation preparation, dehydrogenation preparation, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of large hydrogen consumption and low catalyst efficiency, and achieve high Catalytic activity, effect of high feedstock conversion

Active Publication Date: 2022-04-12
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the technical problems of large amount of hydrogen used and low catalyst efficiency in existing methods for preparing corresponding alcohols and / or ketones by hydrogenation of phenolic compounds, thereby providing a hydrogenation catalyst and its preparation method and application, And a kind of method of hydrogenation reaction of phenols

Method used

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  • A hydrogenation catalyst, its preparation method and application, and a method for hydrogenation reaction of phenols
  • A hydrogenation catalyst, its preparation method and application, and a method for hydrogenation reaction of phenols
  • A hydrogenation catalyst, its preparation method and application, and a method for hydrogenation reaction of phenols

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preparation example Construction

[0035] According to a second aspect of the present invention, the present invention provides a method for preparing the hydrogenation catalyst, the method comprising:

[0036] (1) Preparation of modified carrier: In the presence of an inert solvent, the amino group-containing organosilylating agent is brought into contact with the carrier to functionalize the carrier (usually amino groups are introduced via silicon-oxygen bonds on the carrier) to obtain the The modified carrier;

[0037] (2) Impregnation: impregnating the modified carrier with an impregnation solution containing the compound of the active component to obtain a catalyst precursor;

[0038](3) Reduction: contacting the catalyst precursor with a reducing agent to reduce the compound containing the active component to obtain the hydrogenation catalyst.

[0039] In step (1), the functionalization can be carried out in the following manner: after mixing the carrier, the amino group-containing organosilylating agent...

Embodiment 1

[0102] What the present embodiment prepared was Pd / C hydrogenation catalyst (containing 0.4% by weight of Pd), and the preparation method included:

[0103] (1) Add the strip-shaped activated carbon carrier into absolute ethanol to obtain a mixed solution, and slowly add aminopropyltriethoxysilane (the mass of aminopropyltriethoxysilane and activated carbon carrier) at 70°C under stirring conditions The ratio is 1:5), refluxed for 12h, and then cooled to room temperature, the solid matter was separated, washed with absolute ethanol, and dried at 80°C for 8h to obtain a modified carrier;

[0104] (2) PdCl 2 Prepare an impregnation solution with absolute ethanol, place the modified carrier in the impregnation solution, stir and reflux at 80°C for 20h, then cool to room temperature, separate the solid matter, wash with absolute ethanol, and dry at 80°C for 4h , to obtain the catalyst precursor;

[0105] (3) Place the catalyst precursor in an aqueous solution of hydrazine hydrat...

Embodiment 2-7

[0107] The hydrogenation catalyst was prepared by the same method as in Example 1, except that the composition of the impregnating solution and / or the type of carrier was changed accordingly to obtain the hydrogenation catalyst. The serial numbers and specific compositions of the catalysts are shown in Table 1.

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Abstract

The invention relates to the field of catalytic hydrogenation reaction, and discloses a hydrogenation catalyst, a preparation method and application thereof, and a method for hydrogenation reaction of phenols. The hydrogenation catalyst comprises a modified carrier and an active component loaded on the modified carrier, the active component is selected from at least one of Pd, Rh and Ru, and the modified carrier is obtained by containing an amino group The organosilylating agent is used to functionalize the carrier. The hydrogenation catalyst of the present invention has relatively high catalytic activity, and in the hydrogenation reaction of phenolic compounds, the hydrogenation catalyst can still be used at low temperature, low pressure and low hydrogen phenol mole Ratio of mild conditions to achieve high conversion of raw materials and product selectivity.

Description

technical field [0001] The invention relates to the field of catalytic hydrogenation reaction, in particular, it provides a hydrogenation catalyst and its preparation method and application, and the invention also provides a method for hydrogenation reaction of phenols. Background technique [0002] The hydrogenation of phenols to the corresponding alcohols or ketones is an important class of hydrogenation reactions used in industry. The hydrogenation reaction of phenols includes, for example, the hydrogenation of phenol to prepare cyclohexanol and / or cyclohexanone, the hydrogenation of methylphenol to prepare methylcyclohexanol, the hydrogenation of nonylphenol to prepare nonylcyclohexanol, p-methoxy Hydrogenation of phenylphenol to produce p-methoxycyclohexanone, and hydrogenation of resorcinol to produce 1,3-cyclohexanedione, etc. Most of the catalysts for the hydrogenation of phenols to prepare corresponding alcohols or ketones use noble metals, and additives such as ir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J23/46C07C29/20C07C35/08C07C45/00C07C49/403C07C49/517
CPCC07C29/20C07C45/002B01J23/44B01J23/462B01J23/464C07C35/08C07C49/403C07C49/517
Inventor 向明林汪永军周冬京杜鹏敖博佘喜春
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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