Yellow tungsten (Yellow tungsten) refers to the oxide layer formed by tungsten metal at high temperature. Its main component is tungsten oxide (WO3).
Significant sublimation at 850°C. It hardly reacts with inorganic acids except hydrofluoric acid, and can be slowly dissolved in ammonia water or concentrated alkali solution. It reacts with chlorine gas to form oxychloride, but it cannot react with bromine and iodine. The structure of tungsten trioxide depends on the temperature: it is tetragonal above 740°C, orthorhombic at 330-740°C, monoclinic at 17-330°C, and trigonal at -50-17°C. Oblique crystal system. The monoclinic structure is the most common, and its space group is P21/n. Some common chemical properties of yellow tungsten:
Reactivity of yellow tungsten
Yellow tungsten has good chemical stability at room temperature, and has good corrosion resistance to most non-oxidizing acids and alkalis. However, yellow tungsten may react and be further oxidized under high temperature and strong oxidizing conditions.
Solubility of yellow tungsten
Yellow tungsten has relatively low solubility, especially at normal temperatures and pressures. It is almost insoluble in water at normal temperature, but can be dissolved at high temperature, high pressure or when it reacts with alkaline solution.
The acidity of yellow tungsten
Yellow tungsten itself does not have obvious acidity, but when it reacts with acidic solution or strong acid, it can be dissolved or form corresponding tungstate.
Reduction of yellow tungsten
Yellow tungsten can be reduced to tungsten metal or other low-oxidation tungsten compounds under high temperature conditions.
Catalytic properties of yellow tungsten
Due to its high surface area and special structure, yellow tungsten can exhibit certain catalytic activity, especially in some redox reactions and acid-base catalytic reactions.
The chemical properties of yellow tungsten may be affected by the presence of an oxide layer and special preparation methods, so the specific chemical properties may vary depending on the conditions and experimental environment. In practical application and research, it is necessary to consider and evaluate the chemical properties of yellow tungsten and its interaction with other substances according to specific situations.
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