Dehydrogenation catalyst, preparation method thereof, and dehydrogenation method

A dehydrogenation catalyst and dehydrogenation technology, applied in the field of dehydrogenation, can solve the problems of harsh conditions, low yield, poor selectivity, etc., and achieve the effects of high stability, high dehydrogenation activity and long life

Active Publication Date: 2014-10-01
昌德新材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a class of important reaction to synthesize diphenol derivatives by derivatives of cyclohexanediol as intermediate dehydrogenation, and the derivatives of pyrocatechol are usually synthesized by using pyrocatechol as raw material in existing methods, while The conditions of this type of reaction are harsh, and there are many side reactions, the selectivity is poor, and the yield is not high
In particular, the dehydrogenation method of derivatives of cyclohexanediol containing ether bonds has not been reported

Method used

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  • Dehydrogenation catalyst, preparation method thereof, and dehydrogenation method
  • Dehydrogenation catalyst, preparation method thereof, and dehydrogenation method

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preparation example Construction

[0011] The invention provides a method for preparing a dehydrogenation catalyst, wherein the method comprises: mixing a water-soluble nickel-containing compound and an acidic sol with ethanol, and adjusting the pH value of the resulting mixture to 5-9 with an alkaline substance, and Standing and aging under the condition of the pH value, then washing with water and drying to obtain a solid; mixing the solid and the dehydrogenation aid components and roasting.

[0012] In the present invention, in order to make the dehydrogenation aid component mixed with the solid as evenly as possible, so that each component on the prepared dehydrogenation catalyst is evenly distributed, preferably the solid and the dehydrogenation aid component A solution (for example, an aqueous solution of the dehydrogenation aid component) is mixed and roasted.

[0013] The dehydrogenation catalyst prepared according to the aforementioned method is used for the dehydrogenation of the present invention, ha...

preparation Embodiment 1

[0047] 39 grams of Ni (NO 3 ) 2 ·6H 2 O and 390 grams of acidic silica sol (pH value 4) with a solid content of 30 mass % are miscible in 500 ml of absolute ethanol to obtain a mixture, adding aqueous sodium carbonate solution (concentration is 1.5mol / L) to adjust the pH of the mixture The value is 7-7.2, at 50°C, continue to stand for aging for 1 hour, then filter to obtain a solid precipitate, wash the solid precipitate with deionized water until it is free of sodium, then wash it again with 500ml of absolute ethanol, and finally in Dry at 110°C for 20 hours to obtain a solid;

[0048] Weighed 50 grams of the above-mentioned solid that had been crushed to 300 meshes, and 9 grams of aqueous sodium sulfate solution (concentration: 20% by mass), kneaded, and then calcined at 500° C. for 2 hours to obtain catalyst C1.

preparation Embodiment 2

[0050] 780 grams of Ni(NO 3 ) 2 ·6H 2 O and 1950 grams of acidic silica-alumina sol (pH value is 6) with a solid content of 10 mass % are miscible in 500 ml of dehydrated alcohol to obtain a mixture, adding aqueous sodium carbonate solution (concentration is 1.5mol / L) to adjust the concentration of the mixture The pH value is 8-9, at 50°C, continue to stand for aging for 6 hours, then filter to obtain a solid precipitate, wash the solid precipitate with deionized water until it is sodium-free, and then wash it again with 500ml of absolute ethanol, and finally Dry at 100°C for 15 hours to obtain a solid;

[0051] Weighed 50 g of the above-mentioned solid that was crushed to 300 mesh, added 20 g of sodium sulfate aqueous solution (concentration: 20% by mass), kneaded, and then calcined at 300° C. for 5 h to obtain catalyst C2.

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Abstract

The invention provides a dehydrogenation catalyst and a preparation method thereof. The preparation method comprises the following steps: mixing an aqueous nickel-containing compound with acidic sol and ethanol, adjusting the pH value of the mixture to 5 to 9 with an alkaline substance, then allowing the system to stand still for a while to carry out aging under the pH value, washing and drying so as to obtain a solid substance, mixing the solid substance with a dehydrogenation auxiliary agent component, and finally burning the mixture. The invention further provides a dehydrogenation method, which comprises a step of contacting cyclohexanediol and / or cyclohexanediol derivatives containing ether bonds with a dehydrogenation catalyst under a catalytic dehydrogenation condition, wherein the dehydrogenation catalyst is prepared by the method mentioned above. The dehydrogenation catalyst prepared by the method provided by the invention can be applied to bio-dehydrogenation of cyclohexanediol and / or cyclohexanediol derivatives containing ether bonds, and has the advantages of high dehydrogenation activity, high stability, and long service life.

Description

technical field [0001] The invention relates to a preparation method of a dehydrogenation catalyst, a dehydrogenation catalyst prepared by the method, and a dehydrogenation method. Background technique [0002] There are many types of dehydrogenation catalysts currently used for the dehydrogenation of cyclohexanediol, but the activity and stability of the existing dehydrogenation catalysts still need to be further improved. [0003] At the same time, there are many derivatives of cyclohexanediol, many of which are important chemical intermediates. It is a class of important reaction to synthesize diphenol derivatives by derivatives of cyclohexanediol as intermediate dehydrogenation, and the derivatives of pyrocatechol are usually synthesized by using pyrocatechol as raw material in existing methods, while The conditions of this type of reaction are harsh, and there are many side reactions, the selectivity is poor, and the yield is not high. In particular, there is no repor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/055C07C41/18C07C43/23C07C43/253C07C37/06C07C39/10
Inventor 何嘉勇蒋卫和肖海军屈铠甲陈青祥郑红翠王德清姜红军林民舒兴田
Owner 昌德新材科技股份有限公司
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