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Preparation method of wolfram carbide-carbon (WC-C) composite material with large specific surface area

A composite material, WC-C technology, used in chemical instruments and methods, catalyst activation/preparation, electrodes, etc., can solve problems such as performance barriers, low specific surface area, etc., to reduce carbonization time and temperature, high specific surface area, Preparing convenient effects

Active Publication Date: 2011-05-25
海宁市黄湾镇资产经营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method involves making cerams by mixing two different materials together under certain conditions until they form strong bonds with each other. These stronger bondings make it easier than traditional methods like sintering that require long periods of heat treatment. Additionally, this new approach allows for more precise control over how these components are formed during production compared to previous techniques such as solid phase synthesis.

Problems solved by technology

The technical problem addressed by this patented research relates to improving the effectiveness or functionality of chemically active substances used for various purposes such as producing organic compounds through oxidative coupling reactions with molecular oxygen under controlled conditions. This can be achieved either by modifying the shape or adding other elements that enhance their interaction between atoms on the metal lattice during reaction processes or by combining different types of metals together into composites called heteroepitaxially grown films which are then deposited onto substrate surfaces like ceramics or glasses.

Method used

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  • Preparation method of wolfram carbide-carbon (WC-C) composite material with large specific surface area
  • Preparation method of wolfram carbide-carbon (WC-C) composite material with large specific surface area
  • Preparation method of wolfram carbide-carbon (WC-C) composite material with large specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ammonium metatungstate is used as the precursor and magnesium powder is used as the reduction catalyst. Under the protection of nitrogen, the ammonium metatungstate and magnesium powder with a mass ratio of 1:0.2 are evenly mixed and put into the quartz boat, and then moved into the tube type with nitrogen gas. in the furnace. Reductive carbonization was carried out in a tube furnace in a temperature-programmed manner using 100 ml / min of CO as the carbonization gas. The temperature programming rate was 5°C / min. Heat at 850°C for 4 hours. After the reaction is completed, cool down to room temperature under the protection of nitrogen, put the sample into hydrochloric acid solution to remove the metal, filter and dry, and obtain a black powder which is the high specific surface area WC-C composite material. Its specific surface test result is 287.2m 2 / g.

Embodiment 2

[0023] The spray-dried spherical ammonium metatungstate is used as the precursor, and the magnesium powder is used as the reduction catalyst. Under the protection of nitrogen, the ammonium metatungstate and magnesium powder with a mass ratio of 1:0.5 are evenly mixed and put into the quartz boat, and then moved into the in a tube furnace with nitrogen. Reductive carbonization was carried out in a tube furnace in a temperature-programmed manner using 150 ml / min of CO as the carbonization gas. The temperature programming rate was 10°C / min. Keep warm at 900°C for 4 hours. After the reaction is completed, cool down to room temperature under the protection of nitrogen, put the sample into hydrochloric acid solution to remove the metal, filter and dry, and obtain a black powder which is the high specific surface area WC-C composite material. Its specific surface test result is 309.7m 2 / g.

Embodiment 3

[0025] Ammonium metatungstate is used as a precursor, magnesium powder is used as a reduction catalyst, and ammonium metatungstate and magnesium powder with a mass ratio of 1:1 are evenly mixed under the protection of nitrogen, put into a quartz boat, and then moved into a tube with nitrogen. in the furnace. Reductive carbonization was carried out in a tube furnace in a temperature-programmed manner using 150 ml / min of CO as the carbonization gas. The temperature programming rate was 4°C / min. Heat at 900°C for 3 hours. After the reaction is completed, cool down to room temperature under the protection of nitrogen, put the sample into hydrochloric acid solution to remove the metal, filter and dry, and obtain a black powder which is the high specific surface area WC-C composite material. Its specific surface test result is 330.2m 2 / g.

[0026] Example 3

[0027] Ammonium metatungstate is used as the precursor and aluminum powder is used as the reduction catalyst. Under the...

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Abstract

The invention discloses a preparation method of a wolfram carbide-carbon (WC-C) composite material with a large specific surface area. The method comprises the following steps of: putting the mixture of a wolfram source and metal powder into a quartz boat in the mass ratio of 1:(0.1-1) under the protection of nitrogen and transferring the mixture into a tubular furnace into which nitrogen is introduced, wherein the wolfram source is taken as a precursor and is ammonium metatungstate, ammonium paratungstate, sodium wolframate or wolframic acid, and the metal powder is Mg, Na or Al powder; and introducing CO serving as a carbonization gas into the tubular furnace at the flow speed of between 20 and 300 mini-liters per minute, performing reduction and carbonization in a programmed temperature raising mode, reacting, cooling to room temperature under the protection of nitrogen, putting a sample into acid solution, removing metal, filtering and drying so as to obtain black powder, namely the WC-C composite material. The preparation method of the invention is simple. The obtained WC-C composite material has the characteristics of high dispersibility and large specific surface.

Description

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Claims

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Application Information

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Owner 海宁市黄湾镇资产经营有限公司
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