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 carbon-containing gases. The polymeric carbon will block the pores on the surface of tungsten carbide, cover the active sites on the surface, and is difficult to remove.

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
Effect test

Embodiment 1

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

[0027] Weigh 0.1g carbon nanotube and 0.0383g W(CO) 6 Put it into a mortar, grind for 30min, so that the metal load is 20%, put it into a fluidized reaction tube, pass through argon gas to purge for 2h, turn on the microwave at 800W under an argon atmosphere and heat for 3, 5, 10 , 20, 30min, tungsten carbide is obtained after the sample is cooled. The XRD spectrum of the obtained tungsten carbide is as 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. The transmission electron micrographs of the obtained samples are shown in Figure 4 , 5 6.

Embodiment 2

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

[0029] Weigh 0.1g carbon nanotube and 0.0287g W(CO) 6 Put it into a mortar, grind it for 30 minutes, so that the metal load is 15%, put it into a fluidized reaction tube, pass it into argon gas to purge for 2 hours, turn on the microwave at 800W and heat it for 30 minutes under an argon atmosphere, and wait for the sample to cool. That is, tungsten carbide is obtained. By changing the amount of carbonyl compound added, tungsten carbide catalytic materials with different loads can be prepared. The XRD spectrum of the obtained tungsten carbide is as 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.

Embodiment 3

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

[0031] Weigh 0.1g carbon nanotube and 0.055g Mo(CO) 6 Put it into a mortar, grind for 30min, so that the metal load is 20%, put it into a fluidized reaction tube, pass through argon gas to purge for 2h, and turn on the microwave 800W under the argon atmosphere to heat for 5, 10, 20 respectively. , 30min, molybdenum carbide is obtained after the sample is cooled. The XRD pattern of the obtained 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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