Tungsten Carbide Catalysis (1)
- Details
- Category: Tungsten Information
- Published on Friday, 04 August 2017 16:05
Tungsten carbide (WC) is a compound of tungsten and carbon. It is a black six square crystal with a metallic luster and a hardness similar to that of diamond.
It is extremely difficult to fuse, as a good conductor of electricity and heat, mainly used in the production of cemented carbide materials, with the development of nanocomposite technology and materials, tungsten carbide applications have renewed vitality.
In 1970s, it was discovered that hydrocarbons could react with hydrogen on tungsten carbide, tungsten carbide is used as a catalyst for some organic reactions because of its surface electronic properties similar to platinum and therefore used as a catalyst instead of platinum.
With regard to the catalytic action of tungsten carbide similar to platinum, some foreign scholars have suggested that the presence of carbon in tungsten carbide changes the surface electronic properties of tungsten and makes it similar to platinum, this view was confirmed by X ray photoelectron spectroscopy analysis of W, WC and Pt, accordingly, the researchers began to replace tungsten carbide in some important chemical reactions such as platinum, rhodium, palladium, iridium, ruthenium and other precious transition metals as catalysts.
According to the characteristics of tungsten carbide, carbide is used as a catalyst for petroleum hydrocarbons such as ethane, methane, heptane and other petroleum products.
Methane, a major component of natural gas, is considered a promising source of hydrogen because of its large reserves, methane conversion to syngas involves three ways: steam reforming, CO2 dry gas reforming and oxygen reforming. The conventional methane synthesis reaction involves the use of rare noble metals such as platinum as catalysts. Because of the high price of catalysts, the application of methane as hydrogen source is limited.
Some scholars have used tungsten carbide to study the catalytic performance of methane reforming synthesis gas, results show that tungsten carbide in the steam reforming, has better catalytic properties of carbon dioxide dry reforming of methane and oxygen reforming process, conversion rate of about 90%, and the use of tungsten carbide catalyst will not produce carbon deposition phenomenon.
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