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Preparation method of bowl-shaped carbon-molybdenum carbide composite material

A composite material and molybdenum carbide technology, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of complex preparation of precursors, large product particles, large particles, etc., and achieve process parameters that are easy The effect of control, simple preparation process and uniform particle size

Active Publication Date: 2016-08-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Solvothermal reduction method, which is to reduce molybdenum oxide to molybdenum carbide by using a substance with strong reducing ability (KBH4). This method is simple and easy to control, and the temperature is low, but the product is impure. (4) Metal precursor cracking method, which is obtained by pyrolysis of a mixture of metal-organic compounds and ammonium molybdate and hexamethylenetetramine, but the preparation of the precursor is complicated and the obtained particles are relatively large
In addition, there are reports of CVD, hydrothermal method, ultrasonic method, microwave method, etc., but these methods also have the problems of small yield, insufficient reaction, large product particles, and impure products.
The above methods are limited and have their own characteristics, so there are big deficiencies in practical application, especially in the mass production of catalysts.

Method used

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  • Preparation method of bowl-shaped carbon-molybdenum carbide composite material
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  • Preparation method of bowl-shaped carbon-molybdenum carbide composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0015] A kind of preparation method of bowl-shaped carbon and molybdenum carbide composite material, it is realized by following steps:

[0016] (1) Fully dissolve cetyltrimethylammonium bromide in a mixture of ethanol and water with a volume ratio of 1:2 to form a 0.6g / L cetyltrimethylammonium bromide solution, add Silica micro-nanospheres with a molar ratio of 0.3:6 to cetyltrimethylammonium bromide, after uniform dispersion, add p-benzene with a molar ratio of 0.1:1.5 to cetyltrimethylammonium bromide Diphenol, then add formaldehyde solution, the molar ratio of formaldehyde in the described cetyltrimethylammonium bromide and formaldehyde solution is 0.6:5; Then add and cetyltrimethylammonium bromide molar ratio is 0.3: 14 hydrazine hydrate, finally add ammonium molybdate with a molar ratio of 0.1:3 to cetyltrimethylammonium bromide, stir at room temperature for 18 hours, and dry to obtain a solid powder;

[0017] (2), the solid powder obtained in step (1) was heated at 700...

Embodiment 2

[0020] A kind of preparation method of bowl-shaped carbon and molybdenum carbide composite material, it is realized by following steps:

[0021] (1) Fully dissolve cetyltrimethylammonium bromide in a mixture of ethanol and water with a volume ratio of 1:2 to form a 2g / L cetyltrimethylammonium bromide solution, add Silica micro-nanospheres with a molar ratio of cetyltrimethylammonium bromide of 0.6:5, after uniform dispersion, add m-phthalamide with a molar ratio of 0.3:2 to cetyltrimethylammonium Phenol, then add formaldehyde solution, the molar ratio of formaldehyde and cetyltrimethylammonium bromide in the said formaldehyde solution is 0.1:8; hydrazine hydrate, and finally add phosphomolybdic acid with cetyltrimethylammonium bromide molar ratio of 0.3: 6, after stirring at room temperature for 15h, dry to obtain solid powder;

[0022] (2), the solid powder obtained in step (1) was heated at 800 o Calcining for 3 hours under C to obtain the first product of the composite ma...

Embodiment 3

[0025] A kind of preparation method of bowl-shaped carbon and molybdenum carbide composite material, it is realized by following steps:

[0026] (1) Fully dissolve cetyltrimethylammonium bromide in a mixture of ethanol and water with a volume ratio of 1:2 to form a 4g / L cetyltrimethylammonium bromide solution, add Silica micronanospheres with cetyltrimethylammonium bromide molar ratio of 0.1:5.5, after uniform dispersion, add phthalic trimethylammonium bromide with cetyltrimethylammonium bromide molar ratio of 0.6:0.9 Phenol, then add formaldehyde solution, the molar ratio of formaldehyde and cetyltrimethylammonium bromide in the said formaldehyde solution is 0.3:10; hydrazine hydrate, finally added phosphomolybdic acid in a molar ratio of 0.6:1 to cetyltrimethylammonium bromide, stirred at room temperature for 17 hours, and dried to obtain a solid powder;

[0027] (2), the solid powder obtained in step (1) was heated at 900 o Calcining for 3 hours under C to obtain the firs...

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Abstract

The invention relates to the field of catalytic materials, in particular to a preparation method of a bowl-shaped carbon-molybdenum carbide composite material. The preparation method comprises the steps that hexadecyl trimethyl ammonium bromide, silicon dioxide micro-nanospheres, hydroquinone or resorcinol or pyrogallol, a formaldehyde solution, hydrazine hydrate and hydrazine hydrate or phosphomolybdic acid are mixed, stirred, dried and then subjected to calcining and heating treatment, and the composite material is obtained. According to the preparation method of the bowl-shaped carbon-molybdenum carbide composite material, the preparation process is simple, operation is convenient, technological parameters are easy to control, the obtained carbon particles have the bowl-shaped morphology and are uniform in particle size and high in dispersity, and a novel composite material obtained by compounding the carbon particles with molybdenum carbide is expected to be applied to the catalytic field.

Description

technical field [0001] The invention relates to the field of catalytic materials, in particular to a method for preparing a bowl-shaped carbon and molybdenum carbide composite material. Background technique [0002] Metal carbides are a new class of functional materials with high hardness, high melting point, good thermal stability and corrosion resistance, and have been applied in many fields. In the 1990s, Ledoux et al. reported that metal carbides have the characteristics of noble metals. They believed that in metal carbides, carbon atoms are filled in the metal lattice, causing changes in electron density, increasing the lattice parameters, and the lattice spacing. Increase, resulting in shrinkage of the d-band, increase in the density of d electrons in the Fermi energy state, and thus have similar surface properties and absorption characteristics to noble metals. In recent years, carbides, especially molybdenum carbides, have attracted widespread attention as a new cla...

Claims

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Application Information

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IPC IPC(8): C01B31/34B01J27/22
CPCB01J27/22C01P2002/01C01P2002/72C01P2004/03
Inventor 杜建平王金平侯小红赵治军吴金婷赵天赐
Owner TAIYUAN UNIV OF TECH
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