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Tungsten carbide catalyst and its preparation method and special retort

A technology of tungsten carbide catalyst and carbonization reaction, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, chemical instrument and method, etc., and can solve problems such as improvement, separation, and low catalyst activity

Inactive Publication Date: 2006-10-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent CN86106868A discloses a production method and special equipment for a tungsten carbide catalyst. This patent only involves the control of the preparation process parameters and the control of the structure and morphology of the final product, so it is impossible to produce a tungsten carbide catalyst with a mesoporous structure. Its special equipment does not separate the roasting and reduction carbonization processes, and the final catalyst activity is not high
[0006] To further improve the catalytic activity of tungsten carbide, the key is to increase its specific surface area; the catalytic performance of tungsten carbide mainly depends on the morphology and structural characteristics of the particles, and the morphology and structural characteristics of tungsten carbide catalyst particles are closely related to the morphology and structural characteristics of the precursor. Related; the preparation process conditions have a certain influence and restriction on the specific surface area of ​​tungsten carbide, but it cannot fundamentally solve the problem of improving the catalytic performance of tungsten carbide; to improve the catalytic performance of tungsten carbide catalysts, not only must pay attention to its preparation process conditions, More attention should be paid to the control and processing of the structure and morphology of the precursor

Method used

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  • Tungsten carbide catalyst and its preparation method and special retort
  • Tungsten carbide catalyst and its preparation method and special retort
  • Tungsten carbide catalyst and its preparation method and special retort

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] refer to figure 2 , a T-shaped carbonization furnace, including a shell, a T-shaped reaction tube, a material receiving tank 1 and a material boat 2 for placing reactants. The T-shaped reaction tube is welded by heat-resistant steel, including the gas pretreatment section 3, the reaction section 4 and the feeding pipe 5. The gas pretreatment section 3 is filled with metal filler 6 and connected to the gas inlet 7; the feeding pipe 5 is located in the gas pretreatment section. Between the treatment section 3 and the reaction section 4, the feeding pipe 5 is connected to the expanding pipe 8, and the expanding pipe 8 is inserted into the receiving water tank 1; The tungsten carbide outlet 9; the reaction section 4 connects the reacted gas outlet 10 and the boat inlet cock 11. The shell is made up of a low temperature section 12 and a high temperature section 13, the low temperature section 12 is 3 times as long as the material boat 3, and the high temperature section 13...

Embodiment 2

[0055] Utilize the mesoporous tungsten carbide catalyst prepared in Example 1 to prepare a gas diffusion electrode, and use the polarization curve method to test the catalytic activity of the gas diffusion electrode. The results are shown in Figure 5 bCurve. The instrument used is a microcomputer-controlled CHI620B electrochemical analyzer. The experiment uses a three-electrode test system, and the electrolyte is H 2 SO 4 (2mol / dm 3 ), the reference electrode is a saturated calomel electrode, the counter electrode is a Pt sheet, the experimental temperature is 25±1°C, the hydrogen flow rate is 100ml / min, and the scanning rate is 0.5mv / min.

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Abstract

This invention relates to a tungsten carbide catalyzer and its process method and special device. The said catalyzer is of the shape of inter-hole structure and hollow ball particle. Its process comprises the following steps: solving the material of ammonium metatungstate in water to process solution after evenly shaking with ten to thirty percent; then guiding the said solution into the spray dryer to get the front driver of H2WO3 particles; then baking the particle and reduction reaction; then cooling down the reaction product in the isolation environment; separating the product to get the inter-hole structure of hollow balltungsten carbide catalyzer.

Description

(1) Technical field [0001] The invention relates to a tungsten carbide catalyst and its preparation method and special equipment, especially a hollow spherical tungsten carbide catalyst with a mesoporous structure. (2) Background technology [0002] Tungsten carbide usually refers to the general term of tungsten carbide, and tungsten carbide as a catalyst is mainly tungsten carbide (WC) and tungsten carbide (W 2 C). [0003] The existing tungsten carbide preparation methods are various, mainly including gas phase reaction, gas-solid reaction, solid phase exchange reaction, liquid phase reaction and so on. The tungsten carbide catalysts prepared by these methods are mostly WC and W 2 The mixture of C has problems such as small specific surface area, poor catalytic activity, complex system, low efficiency, high production cost, and difficult control of process conditions, which are difficult to implement in practical applications. [0004] The structures and shapes of the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22B01J37/00
Inventor 马淳安李国华张维民
Owner ZHEJIANG UNIV OF TECH