1. Physical Properties
Appearance: vanadium pentoxide is an orange to dark yellow crystalline solid in its common form.
Melting point: about 690 degrees Celsius, which is low for a refractory metal oxide and matters for process design.
Density: around 3.36 g/cm3 for the crystalline form.
Solubility: sparingly soluble in water but soluble in acids and alkalis, which matters for processing and recovery.
Form: supplied as flake, powder or fused material depending on the application.
2. Chemical Properties
Vanadium in vanadium pentoxide is in the +5 oxidation state, the highest common state of the element. The compound is amphoteric, dissolving in both acids and bases, and it can be reduced to lower vanadium oxides or to vanadium metal by appropriate reducing agents. This chemistry is the basis of both the catalytic use and the metallurgical reduction to ferrovanadium.
3. Catalytic Activity
Vanadium pentoxide is a powerful oxidation catalyst. In the contact process, it catalyzes the oxidation of sulfur dioxide to sulfur trioxide; in SCR systems, it catalyzes the reduction of nitrogen oxides to nitrogen. The catalytic activity depends on the surface area, the support material and the purity of the V2O5, and it is the reason catalyst grades require tight impurity control.
4. Metallurgical Behavior
In ferrovanadium production, vanadium pentoxide is reduced by aluminium or silicon in an exothermic reaction to produce the vanadium-iron alloy. The purity of the oxide, especially its phosphorus content, directly affects the quality of the ferrovanadium. The reduction behavior is controlled by the particle form and the charge preparation.
5. Practical Handling Considerations
Vanadium compounds require dust control and protective equipment during handling.
Store in dry, sealed packaging to preserve the product and prevent contamination.
Confirm the purity and impurity profile against the application.
Follow the safety data sheet for the specific form and grade.
6. FAQ
Q1: What does vanadium pentoxide look like? It is an orange to dark yellow crystalline solid.
Q2: What is the melting point of V2O5? About 690 degrees Celsius.
Q3: Why is V2O5 a good catalyst? Its +5 vanadium state and surface chemistry catalyze oxidation and reduction reactions in acid production and SCR systems.
Q4: Is vanadium pentoxide soluble? It is sparingly soluble in water but dissolves in acids and alkalis, which matters for processing.
Q5: What is V2O5 used for? Ferrovanadium production, sulfuric acid and SCR catalysts, glass, ceramics and vanadium batteries.
Q6: What are the handling requirements? Dust control, protective equipment, dry storage and compliance with the safety data sheet.
