Prepare High-Surface Area Composite Materials--WC-C

The catalyst, being a necessity of improve the efficiency in chemical, energy industry, and the surface area is one of the main factors to determine the catalyst’s property, that means improving the surface area will directly affect the production efficiency. Tungsten carbide (WC) as a new type of catalyst, the performance improvements are hampered due to the lower-surface area. Therefore, how to improve the catalytic activity has become one of the main challenges in preparing WC catalyst. There is an invention which provides a method to generate high dispersion and surface area of WC-C composite material, and the production can be used in the catalysis fields of chemical and electronic. Specific steps are shown as bellows:

1. Use ammonium paratungstate (APT) as precursor, add active metal powder in the mass ratio that APT: metal is 1:0.1~1 into the quartz boat under the protection of nitrogen, then moved in the tube furnace;
2. Inlet carbonization gas –CO to carry out carbonization at the mode of temperature programmed, and the heating rate is 4~15℃/min;
3. Cooling to room temperature under the protection of nitrogen;
4. Remove metal in the acid solution, and then filtering, drying to get black powder that is WC-C composite materials.

Remarks:
1) Ammonium paratungstate can also be replaced by ammonium metatungstate, sodium tungstate or tungstate;
2) Active metal powder can be Mg, Na or Al;
3) The flow rate of carbonization gas-CO through the tube furnace supposed to be 100~200ml/min;
4) Acid solution which is used to remove metal can be hydrochloric, sulfuric acid and other common acid.

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