Photochemical Smog Formation (NO₂ Photolysis)
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NO2 → NO + O·
概述
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.
参与者
| 角色 | 物质 | 系数 | 状态 |
|---|---|---|---|
| 反应物 | Nitrogen Dioxide NO₂ | 1 | (g) |
| 产物 | Nitric Oxide NO | 1 | (g) |
日常示例
The brown haze visible over cities like Los Angeles on sunny days is photochemical smog, driven by this NO₂ photolysis.
工业重要性
了解光化学烟雾机制对制定机动车尾气排放标准和城市大气污染治理政策至关重要。
属性
- 可逆
- 否
- 能量
- 吸热
- ΔH
- 305.0 kJ/mol
相关反应
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.