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A nitrogen-doped porous carbon-supported molybdenum carbide catalyst and its preparation method and application

A catalyst, molybdenum carbide technology, used in the preparation of carbon-based compounds, catalysts for physical/chemical processes, preparation of amino compounds, etc., can solve the problems of limited number of active sites, easy sintering and agglomeration, low reaction activity, etc., to achieve excellent catalysis The effect of good activity, stability, catalytic activity and high selectivity

Active Publication Date: 2020-06-26
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of current molybdenum carbide catalysts such as easy sintering and agglomeration, small specific area, limited number of active sites, and low reactivity, the purpose of the present invention is to provide a nitrogen-doped porous carbon-supported molybdenum carbide catalyst and its preparation method and application

Method used

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  • A nitrogen-doped porous carbon-supported molybdenum carbide catalyst and its preparation method and application
  • A nitrogen-doped porous carbon-supported molybdenum carbide catalyst and its preparation method and application
  • A nitrogen-doped porous carbon-supported molybdenum carbide catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: Weigh 3.0 g of glucose and 5.0 g of urea, and continue to stir for 20 min under heating at 120° C. After forming a uniform solution, add 0.88 g of ammonium molybdate tetrahydrate and mix well. Weigh 10.3g of 40wt% silica sol (Si / Mo mass ratio is 4), add the above solution, and stir for 10min. Then, the obtained mixed solution was put into an oven at 180° C. for carbonization reaction, and the reaction time was 24 hours. The obtained black powder is placed in the constant temperature zone of the tubular resistance furnace, raised to 800°C at a heating rate of 2°C / min and kept at a constant temperature for 3 hours, cooled to room temperature after the reaction, treated with lye for 5 hours, filtered and washed with water, and dried. Nitrogen-doped porous carbon-supported molybdenum carbide catalysts are available. The pore structure properties of the prepared catalysts are as follows figure 1 and Table 1, from figure 1 It can be seen from Table 1 that the ni...

Embodiment 2

[0021] Example 2: The preparation process is the same as that of Example 1, the only difference is that the amount of silica sol added is adjusted to 15.5 g, and the mass ratio of Si / Mo is 6.

Embodiment 3

[0022] Example 3: The preparation process is the same as that of Example 1, the only difference is that the amount of silica sol added is adjusted to 20.6g, and the mass ratio of Si / Mo is 8.

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Abstract

A nitrogen-doped porous carbon-supported molybdenum carbide catalyst and its preparation method and application relate to a molybdenum carbide catalyst. The catalyst uses nitrogen-doped carbon material as a carrier to support transition metals and molybdenum carbide; the nitrogen-doped porous carbon carrier has a porous structure. Grind and mix the carbon source, nitrogen source, molybdenum salt and metal salt, then heat and stir to form a molten and uniform solution, then add silica sol template and mix uniformly to form a gel; after heat treatment of the obtained gel, the dark brown solid obtained by carbonization is Heat treatment in an inert atmosphere; remove silicon from the solid obtained by heat treatment in an inert atmosphere, separate, wash and dry to obtain a nitrogen-doped porous carbon supported molybdenum carbide catalyst. The nitrogen-doped porous carbon-supported molybdenum carbide catalyst is used in the catalytic selective hydrogenation of α,β-unsaturated aldehydes and ketones and aromatic nitro compounds in fine chemicals to prepare saturated aldehydes and ketones, α,β-unsaturated alcohols and aromatic amines.

Description

technical field [0001] The invention relates to a molybdenum carbide catalyst, in particular to a nitrogen-doped porous carbon-supported molybdenum carbide catalyst and its preparation method and application. Background technique [0002] As a typical transition metal carbide, molybdenum carbide has the advantages of non-toxicity, environmental friendliness, easy preparation, etc., and has catalytic properties similar to noble metals. It is known as "platinum-like catalyst" and has a wide range of applications in the field of industrial catalysis. . However, pure molybdenum carbide is easy to sinter and agglomerate during the high-temperature preparation process, and often has problems such as small specific surface area and less active surface exposure, which limit the application of this type of molybdenum carbide catalyst. The catalyst performance is closely related to the structure. In order to further obtain high-performance molybdenum carbide catalysts, it is particul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10C07C209/36C07C211/45C07C45/62C07C47/228
CPCC07C45/62C07C209/36B01J27/24B01J35/61B01J35/66C07C211/45C07C47/228
Inventor 赖伟坤宋文静连奕新霍秀春张杰伊晓东方维平
Owner XIAMEN UNIV
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