Hall-Héroult Process (Aluminum Smelting)

2Al₂O₃ + 3C → 4Al + 3CO₂

Visão geral

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

Papel	Substância	Coeficiente	Estado
Reagente	Aluminum Oxide Al₂O₃	2	(l)
Reagente	Carbon C	3	(s)
Produto	Carbon Dioxide CO₂	3	(g)
Produto	Aluminum Al	4	(l)

Exemplo do cotidiano

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

Importância industrial

A fundição de alumínio produz 65 milhões de toneladas anualmente e consome cerca de 3% da eletricidade mundial. O alumínio é o metal estrutural mais utilizado após o aço, essencial para a aviação, embalagem e construção.

Propriedades

Tipo: Electrochemical
Reversível: Não
Energia: Endotérmico
ΔH: 2168,0 kJ/mol
Catalisador: 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).