Hall-Héroult Process (Aluminum Smelting)
2Al2O3 + 3C → 4Al + 3CO2
Tổng quan
Alumina (Al₂O₃) is dissolved in molten cryolite (Na₃AlF₆) at 960°C and electrolyzed using carbon anodes. Aluminum is deposited at the cathode and oxygen reacts with the carbon anode to form CO₂. Independently invented by Charles Hall and Paul Héroult in 1886, this process reduced aluminum from a precious metal to a commodity.
Người tham gia
| Vai trò | Chất | Hệ số | Trạng thái |
|---|---|---|---|
| Chất phản ứng | Aluminum Oxide Al₂O₃ | 2 | (l) |
| Chất phản ứng | Carbon C | 3 | (s) |
| Sản phẩm | Carbon Dioxide CO₂ | 3 | (g) |
| Sản phẩm | Aluminum Al | 4 | (l) |
Ví dụ thực tế
Every piece of aluminum foil, beverage can, and airplane wing was produced by the Hall-Héroult process.
Tầm quan trọng công nghiệp
Aluminum smelting produces 65 million tonnes annually and consumes about 3% of global electricity. Recycling uses only 5% of the energy.
Tính chất
- Loại
- Electrochemical
- Thuận nghịch
- Không
- Năng lượng
- Thu nhiệt
- ΔH
- 2168,0 kJ/mol
- Chất xúc tác
- Cryolite (Na₃AlF₆) solvent
Phản ứng liên quan
Frequently Asked Questions
What is the equation for Hall-Héroult Process (Aluminum Smelting)?
The balanced equation is: 2Al₂O₃ + 3C → 4Al + 3CO₂.
What type of reaction is Hall-Héroult Process (Aluminum Smelting)?
Hall-Héroult Process (Aluminum Smelting) is a electrochemical reaction.
Is Hall-Héroult Process (Aluminum Smelting) exothermic or endothermic?
Hall-Héroult Process (Aluminum Smelting) is endothermic (absorbs energy). The enthalpy change (ΔH) is 2168.0 kJ/mol.
What conditions are needed for Hall-Héroult Process (Aluminum Smelting)?
This reaction requires a catalyst (Cryolite (Na₃AlF₆) solvent).