Method for preparing transitional metal carbides catalytic material and use

A transition metal and catalytic material technology, applied in the preparation and application of transition metal carbide catalytic materials, can solve problems such as difficult to remove, and achieve the effect of improving the efficiency of the catalytic process, high activity and selectivity, and simple methods

Inactive Publication Date: 2009-02-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, due to the use of hydrocarbon carburizing agents, the surface of the obtained carbide is polluted by the polymeric carbon formed by the pyrolysis of c

Method used

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  • Method for preparing transitional metal carbides catalytic material and use
  • Method for preparing transitional metal carbides catalytic material and use
  • Method for preparing transitional metal carbides catalytic material and use

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0026] Example 1 Preparation of carbon nanotube-supported tungsten carbide catalytic material

[0027] Weigh 0.1g carbon nanotubes and 0.0383g W(CO) 6 Put it in a mortar, grind for 30 minutes to make the metal load 20%, put it into a fluidized reaction tube, purge with argon for 2h, turn on the microwave 800W under argon atmosphere to heat 3, 5, 10 respectively , 20, 30min, after the sample is cooled, tungsten carbide can be obtained. The obtained XRD spectrum of tungsten carbide is as follows figure 1 Shown. It was identified as tungsten carbide by X-ray powder diffraction. The specific surface area of ​​the sample is 69.5653m 2 / g. See the transmission electron microscope photo of the obtained sample Figure 4 , 5 , 6.

Example Embodiment

[0028] Example 2 Preparation of carbon nanotube-supported tungsten carbide catalytic material

[0029] Weigh 0.1g carbon nanotubes and 0.0287g W(CO) 6 Put it in a mortar and grind for 30 minutes to make the metal load 15%, put it into a fluidized reaction tube, purge with argon for 2 hours, turn on the microwave 800W and heat it for 30 minutes in an argon atmosphere, and wait until the sample is cooled That is, tungsten carbide is obtained. By changing the amount of carbonyl compound added, tungsten carbide catalytic materials with different loadings can be prepared. The obtained XRD spectrum of tungsten carbide is as follows figure 2 Shown. It was identified as tungsten carbide by X-ray powder diffraction. The specific surface area of ​​these samples is 74-86m 2 / g.

Example Embodiment

[0030] Example 3 Preparation of carbon nanotube supported molybdenum carbide catalytic material

[0031] Weigh 0.1g carbon nanotubes and 0.055g Mo(CO) 6 Put it in a mortar, grind for 30 minutes to make the metal load 20%, put it in a fluidized reaction tube, purge with argon for 2h, turn on the microwave 800W in an argon atmosphere to heat 5, 10, 20 respectively , 30min, molybdenum carbide is obtained after the sample is cooled. The obtained XRD spectrum of molybdenum carbide is as follows image 3 Shown. It was identified as molybdenum carbide by X-ray powder diffraction.

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Abstract

The invention discloses a preparation method and the application of a catalytic material for transition metal carbides, belonging to the preparation technical field of the catalytic material. The invention is characterized in that in the method, carbon material, oxide or molecular sieve, and the like, are used as vectors and transition metal compounds are used as precursors. The vectors and the transition metal precursors are mixed by dipping or mechanical method and a microwave-assisted chemical sedimentation method is adopted to prepare the catalyst for loaded transition metal carbides. The weight percentage of loading of the transition metal compounds is 1-200 percent. Particles of the catalyst for the loaded transition metal carbides are highly uniformly distributed on the surface of the vectors. And the catalyst can be applied to a plurality of reactions of electrocatalysis oxidation of methanol, hydrazine decomposition, acetonitrile hydrogenation, etc. The preparation method and the application have the beneficial effects of simple preparation process and easy operation. And the obtained catalytic material shows high activity in the electrode reaction and a plurality of catalytic reactions of fuel cells.

Description

technical field [0001] The invention belongs to the technical field of preparation of catalytic materials, and relates to a preparation method and application of a transition metal carbide catalytic material, in particular to a microwave-assisted chemical deposition method to convert a transition metal compound into a transition metal carbide, and prepare The catalyst is used in various catalytic reactions such as methanol electrocatalytic oxidation, hydrazine decomposition, acetonitrile hydrogenation or alkane selective hydrogenation. Background technique [0002] Transition metal carbides are a class of mesenchymal compounds with metallic properties produced by carbon atoms entering the lattice of transition metals. They combine the properties of three different substances: covalent solids, ionic crystals and transition metals, thus having special properties. physical and chemical properties. Since it was discovered in the 1970s that transition metal carbides have noble m...

Claims

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Application Information

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IPC IPC(8): B01J27/22H01M4/90C01B21/087C07C209/44C07C211/03C07C5/03C07C5/08
CPCY02E60/50
Inventor 梁长海丁玲马志强邱介山
Owner DALIAN UNIV OF TECH
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