Photochemical Smog Formation (NO₂ Photolysis)

NO2 → NO + O·

Tổng quan

Sunlight (< 420 nm) photolyzes nitrogen dioxide to produce nitric oxide and an oxygen atom. The oxygen atom then reacts with O₂ to form ground-level ozone. Combined with volatile organic compounds from vehicle exhaust, this initiates the complex photochemical smog cycle that plagues urban areas.

Người tham gia

Vai trò Chất Hệ số Trạng thái
Chất phản ứng Nitrogen Dioxide NO₂ 1 (g)
Sản phẩm Nitric Oxide NO 1 (g)

Ví dụ thực tế

The brown haze visible over cities like Los Angeles on sunny days is photochemical smog, driven by this NO₂ photolysis.

Tầm quan trọng công nghiệp

Understanding NO₂ photochemistry is essential for air quality regulation, catalytic converter design, and urban pollution control.

Tính chất

Loại
Photochemical
Thuận nghịch
Không
Năng lượng
Thu nhiệt
ΔH
305,0 kJ/mol

Phản ứng liên quan

Photochromism of Spiropyran Chlorophyll Fluorescence Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Cis-Trans Isomerization of Retinal Photosynthesis Ozone Formation by UV Light Silver Chloride Photodecomposition Dye-Sensitized Solar Cell (Grätzel Cell)

Frequently Asked Questions

What is the equation for Photochemical Smog Formation (NO₂ Photolysis)?
The balanced equation is: NO₂ → NO + O·.
What type of reaction is Photochemical Smog Formation (NO₂ Photolysis)?
Photochemical Smog Formation (NO₂ Photolysis) is a photochemical reaction.
Is Photochemical Smog Formation (NO₂ Photolysis) exothermic or endothermic?
Photochemical Smog Formation (NO₂ Photolysis) is endothermic (absorbs energy). The enthalpy change (ΔH) is 305.0 kJ/mol.