Yellow tungsten oxide, also known as tungsten trioxide (WO3), is an inorganic compound composed of one tungsten (W) atom and three oxygen (O) atoms. It is the most stable form of tungsten oxide and is typically found as a fine, yellow or bright green powder with a high purity level, often exceeding 99.9%. Below is a detailed introduction to yellow tungsten oxide:
- Basic Properties of Yellow Tungsten Oxide
- Appearance: Yellow or bright green powder.
- Purity: Exceeds 99.9%.
- Chemical Formula: WO3.
- Molecular Weight: 231.85.
- Density: The measured density of yellow tungsten oxide typically ranges from 7.21 to 7.30 g/cm³, with X-ray measured density possibly close to 7.27 g/cm³.
- Melting Point: Around 1470°C (some sources indicate 1473°C).
- Chemical Properties of Yellow Tungsten Oxide
- Stability: Yellow tungsten oxide is stable at room temperature and does not readily react with other substances. However, at high temperatures or under specific conditions, it may undergo decomposition or reduction reactions.
- Solubility: Yellow tungsten oxide is insoluble in water and inorganic acids (except for hydrofluoric acid). It is soluble in hot concentrated sodium hydroxide and ammonia solutions.
- Reactivity: Yellow tungsten oxide can react with reducing agents, acidic solutions, and certain elements or compounds.
- Preparation Methods for Yellow Tungsten Oxide
Yellow tungsten oxide is typically produced through methods such as:
- Tungstate Salt Hydrochloric Acid Decomposition Method.
- Ammonium Paratungstate (APT) Thermal Decomposition Method. These methods require strict control of temperature, time, and other process parameters to ensure the production of high-quality yellow tungsten oxide.
- Applications of Yellow Tungsten Oxide
- Industrial Manufacturing: Yellow tungsten oxide is an essential raw material for producing hard alloys, high-melting alloys, and tungsten filaments.
- New Energy Field: As a lithium battery anode material, yellow tungsten oxide is widely used in new energy applications, including electric vehicles.
- Catalysis: Yellow tungsten oxide is an excellent photocatalyst, used in water splitting for hydrogen production and the degradation of organic pollutants. It is also used in petrochemical, biodegradation, and wastewater treatment catalysis.
- Pigments and Colorants: Due to its vibrant yellow color, it is used as a pigment in ceramics and paints.
- Other Applications: Yellow tungsten oxide is also used in fire-resistant materials, gas sensors, solar photovoltaic films, and X-ray shielding materials.
Yellow tungsten oxide, with its unique physical and chemical properties, plays a critical role in various industries. Its applications continue to expand as technology advances, making it an important raw material in industrial manufacturing, new energy, catalysis, pigments, and other sectors.
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