Hall-Héroult Process (Aluminum Smelting)

2Al2O3 + 3C → 4Al + 3CO2

Descripción general

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.

Participantes

Rol Sustancia Coeficiente Estado
Reactivo Aluminum Oxide Al₂O₃ 2 (l)
Reactivo Carbon C 3 (s)
Producto Carbon Dioxide CO₂ 3 (g)
Producto Aluminum Al 4 (l)

Ejemplo cotidiano

Every piece of aluminum foil, beverage can, and airplane wing was produced by the Hall-Héroult process.

Importancia industrial

La fundición de aluminio produce 65 millones de toneladas anuales y consume aproximadamente el 3% de la electricidad mundial. El reciclaje utiliza solo el 5% de esa energía, impulsando la economía circular.

Propiedades

Tipo
Electrochemical
Reversible
No
Energía
Endotérmico
ΔH
2168,0 kJ/mol
Catalizador
Cryolite (Na₃AlF₆) solvent

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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).