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Preparation method and application of eggshell type molybdenum carbide catalyst

A molybdenum carbide, eggshell technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effects of simple operation, excellent performance and easy industrialization

Active Publication Date: 2014-03-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no relevant literature report on the preparation method of eggshell molybdenum carbide catalyst

Method used

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  • Preparation method and application of eggshell type molybdenum carbide catalyst
  • Preparation method and application of eggshell type molybdenum carbide catalyst
  • Preparation method and application of eggshell type molybdenum carbide catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh 0.23g of ammonium paramolybdate into a beaker, measure 25ml of deionized water, and add 5 Al 2 o 3 pellets, let stand for 24 hours. Weigh 0.23g of melamine into another clean beaker, measure 25ml of deionized water, heat to 80°C, and keep the temperature of the solution at 80°C until the melamine is completely dissolved. Filter the soaked Al 2 o 3 The pellets were put into the melamine solution and reacted for 5 minutes. Filter to get Al 2 o 3 Rinse the pellets with deionized water, dry them, place them in an argon atmosphere, raise the temperature to 650°C at a heating rate of 5°C / min, keep the temperature for 90 minutes, and lower it to room temperature to obtain an eggshell-type molybdenum carbide catalyst.

[0023] ICP results show that the mass percent content of metal Mo is 9.3%. The EPMA characterization result of gained eggshell molybdenum carbide catalyst is as follows figure 1 As shown, the transmission electron microscope pictures of molybdenum ...

Embodiment 2

[0025] Weigh 0.2g phosphomolybdic acid and put it into a beaker, and all the other steps are the same as in Example 1.

Embodiment 3

[0027] Weigh 0.2g silicomomolybdic acid and put it into a beaker, and the rest of the steps are the same as in Example 1.

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Abstract

The invention discloses a fast reaction film formation method to prepare an eggshell type molybdenum carbide catalyst and belongs to the technical field of industrial catalysis. The method comprises the following steps: a carrier with a molybdenum oxide perssad adsorbed on the surface is added into a melamine solution, a film composed of a molybdenum carbide precursor is rapidly generated on the surface of the carrier through the fast reaction of melamine and the molybdenum oxide perssad, and the eggshell type molybdenum carbide catalyst is formed via pyrolysis of the film. According to the invention, the technology is simple, the thickness of the shell layer can be controlled, the energy consumption during the process is low, and the utilization rate and the stability of the active components in the prepared eggshell type molybdenum carbide catalyst are high and excellent. The eggshell type molybdenum carbide catalyst has excellent industrial application prospect and can be used for alkene-alkyne selective hydrogenation reaction and other reactions represented by phenylacetylene selective hydrogenation.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysis, and relates to a preparation method and application of an eggshell-type molybdenum carbide catalyst. Background technique [0002] Molybdenum carbide has catalytic properties similar to noble metals, and has a wide range of applications in the field of industrial catalysis. For common poisons in industrial raw materials, such as carbon monoxide, sulfur, nitrogen, etc., molybdenum carbide has an incomparable anti-poisoning ability that precious metals cannot match. Therefore, in many industrial hydrogen-related processes, such as hydrodenitrogenation, hydrofinishing, and hydroisomerization, molybdenum carbide exhibits excellent catalytic performance and high stability, and is a cheap alternative to noble metal catalysts . Molybdenum carbide is subject to particle sintering in the high-temperature preparation process, and often has a small specific surface area and low exposure of ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28C07C15/46C07C5/09
Inventor 梁长海庞敏陈晓贞
Owner DALIAN UNIV OF TECH
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