Photochemical Smog Formation (NO₂ Photolysis)
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NO2 → NO + O·
개요
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.
참여 물질
| 역할 | 물질 | 계수 | 상태 |
|---|---|---|---|
| 반응물 | Nitrogen Dioxide NO₂ | 1 | (g) |
| 생성물 | Nitric Oxide NO | 1 | (g) |
일상 속 예시
The brown haze visible over cities like Los Angeles on sunny days is photochemical smog, driven by this NO₂ photolysis.
산업적 중요성
NO₂ 광화학의 이해는 대기질 규제, 촉매 변환기 설계, 도시 오염 제어에 필수적입니다.
성질
- 가역 반응
- 아니오
- 에너지
- 흡열
- ΔH
- 305.0 kJ/mol
관련 반응
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.