Formation of Sulfur Trioxide

2SO2 + O2 → 2SO3

Tổng quan

Sulfur dioxide reacts with oxygen to form sulfur trioxide in the Contact Process. This reversible reaction requires a vanadium pentoxide catalyst and temperatures around 400-450 C. It is the key step in sulfuric acid manufacturing.

Người tham gia

Vai trò Chất Hệ số Trạng thái
Chất phản ứng Oxygen O 1 (g)
Chất phản ứng Sulfur Dioxide SO₂ 2 (g)
Sản phẩm Sulfur Trioxide SO₃ 2 (g)

Ví dụ thực tế

This reaction occurring in the atmosphere from volcanic emissions or industrial pollution contributes to acid rain formation.

Tầm quan trọng công nghiệp

The Contact Process is the primary industrial method for producing sulfuric acid, the world's most produced chemical. Over 260 million tonnes of sulfuric acid are made annually using this reaction.

Tính chất

Loại
Synthesis
Thuận nghịch
Có
Năng lượng
Tỏa nhiệt
ΔH
-198,2 kJ/mol
Chất xúc tác
Vanadium(V) oxide (V₂O₅)

Phản ứng liên quan

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Frequently Asked Questions

What is the equation for Formation of Sulfur Trioxide?
The balanced equation is: 2SO₂ + O₂ → 2SO₃.
What type of reaction is Formation of Sulfur Trioxide?
Formation of Sulfur Trioxide is a synthesis reaction. It is reversible under certain conditions.
Is Formation of Sulfur Trioxide exothermic or endothermic?
Formation of Sulfur Trioxide is exothermic (releases energy). The enthalpy change (ΔH) is -198.2 kJ/mol.
What conditions are needed for Formation of Sulfur Trioxide?
This reaction requires a catalyst (Vanadium(V) oxide (V₂O₅)).