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Ordered mesoporous carbon encapsulated carbonized metal catalyst for dehydrogenation of alcohol, and preparation method of catalyst

A metal carbide and mesoporous carbon technology, which is applied in catalyst activation/preparation, dehydrogenation preparation, carbon-based compound preparation, etc. High activity and selectivity, solvent-free effect

Active Publication Date: 2018-11-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional preparation methods are difficult to obtain metal carbide catalysts with uniform dispersion and good lattice structure. Therefore, it is of great industrial application value to design and develop a simple and effective preparation method for constructing metal carbide catalysts with ordered mesoporous structure
In order to solve the above problems, the present invention self-assembles templates, tannic acid and metal sources by ball milling, and then high-temperature carbonization to prepare ordered mesoporous carbon-encapsulated metal carbide catalysts, and apply it to alcohol dehydrogenation reactions. Not yet reported

Method used

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  • Ordered mesoporous carbon encapsulated carbonized metal catalyst for dehydrogenation of alcohol, and preparation method of catalyst
  • Ordered mesoporous carbon encapsulated carbonized metal catalyst for dehydrogenation of alcohol, and preparation method of catalyst

Examples

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Effect test

Embodiment 1

[0015] Add F127 and tannic acid to a 30mL stainless steel ball mill tank at a mass ratio of 0.8:1, and add 3 stainless steel balls with a diameter of 1.2cm at the same time, place the ball mill tank on a three-dimensional vibrating ball mill for 30 minutes, and the vibration frequency is 30Hz , then add ammonium molybdate and continue ball milling for 30min, the mass ratio of ammonium molybdate and tannic acid is 1:3, the obtained ball milling mixture is placed in a tube furnace at 800°C for calcination in a nitrogen atmosphere for 2h, and the heating rate is 5°C / min, the ordered mesoporous carbon-encapsulated molybdenum carbide catalyst was obtained.

[0016] figure 1 XRD patterns of molybdenum carbide catalysts encapsulated in ordered mesoporous carbon.

[0017] figure 2 N encapsulation of molybdenum carbide catalysts for ordered mesoporous carbon 2 Adsorption and pore size distribution plots.

Embodiment 2

[0019] Add F127 and tannic acid to a 30mL stainless steel ball mill tank at a mass ratio of 0.8:1, and add 3 stainless steel balls with a diameter of 1.2cm at the same time, place the ball mill tank on a three-dimensional vibrating ball mill for 30 minutes, and the vibration frequency is 30Hz , then add ammonium tungstate to continue ball milling for 30min, the mass ratio of ammonium molybdate and tannic acid is 1:3, put the obtained ball milling mixture in a tube furnace at 900°C for calcination in a nitrogen atmosphere for 3h, the heating rate is 5°C / min, the ordered mesoporous carbon-encapsulated tungsten carbide catalyst was obtained.

Embodiment 3

[0021] Mix benzyl alcohol and DMSO at a mass ratio of 1:5, then add an ordered mesoporous carbon-encapsulated molybdenum carbide catalyst whose mass is 5% of the alcohol mass, and stir for 4 hours at a reaction temperature of 100°C to obtain a mixture containing benzaldehyde products , The conversion and selectivity of the reaction detected by gas chromatography were 98% and 100%, respectively.

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Abstract

The invention discloses an ordered mesoporous carbon encapsulated carbonized metal catalyst for dehydrogenation of alcohols, and a preparation method of the catalyst, and belongs to the technical fields of industrial catalysis and fine organic chemical engineering. According to the invention, a template agent, tannic acid and a metal source are blended, ball milling and self-assembly are carried out, and then high-temperature carbonization is carried out, so that the ordered mesoporous carbon encapsulated carbonized metal catalyst is prepared. The catalyst is used for preparing aldehydes by adehydrogenation reaction of alcohols without oxidizing agents, excellent catalytic activity and selectivity are obtained, and the catalyst can be simply recycled and reused. The preparation catalyst disclosed by the invention has the advantages that the preparation method of the catalyst is simple and convenient, is easy to operate, is free of solvent, has a high speed and can be used for batch production. More importantly, a unique ordered mesoporous confine structure of the catalyst can effectively accelerate the mass transfer of reaction substrates, and the dissolution and agglomeration ofactive components can also be prevented, so that the catalyst is endowed with excellent catalytic performance.

Description

technical field [0001] The invention relates to an ordered mesoporous carbon-encapsulated carbonized metal catalyst for alcohol dehydrogenation and its preparation. It adopts template agent, tannic acid and metal source ball milling for self-assembly, and then prepares an ordered mesoporous carbon encapsulation by high-temperature carbonization. A metal carbide catalyst belongs to the technical field of industrial catalysis and fine organic chemical industry. Background technique [0002] Aldehydes are an important class of chemical intermediates, widely used in fine organic synthesis and organic chemical processes. At present, the common synthetic method of aldehyde is hydrogen peroxide (H 2 o 2 ) or oxygen (O 2 ) is an oxidizing agent, obtained by oxidation of an alcohol under the condition of a noble metal as a catalyst. In order to further save costs and reduce energy consumption, in recent years, people have paid more attention to the use of transition metals (such ...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J35/10B01J37/00C07C45/00C07C47/54C07C49/403
CPCC07C45/002B01J27/22B01J37/0036C07C2601/14B01J35/647C07C47/54C07C49/403Y02P20/584
Inventor 冷炎姜宇晨王大伟蒋平平
Owner JIANGNAN UNIV
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