Photocatalytic NOx Removal
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NOx + O2 + H2O → HNO3
概述
TiO₂ photocatalyst on building surfaces oxidizes nitrogen oxides (NOx) from vehicle exhaust to nitric acid (HNO₃), which is then washed away by rain. Photocatalytic concrete and pavement coatings can reduce local NOx levels by 25–45%. This passive pollution remediation works continuously in sunlight.
参与者
| 角色 | 物质 | 系数 | 状态 |
|---|---|---|---|
| 反应物 | Water H₂O | 1 | (l) |
| 产物 | Nitric Acid HNO₃ | 1 | (aq) |
日常示例
Some cities use photocatalytic concrete in roads and buildings that actively clean the air of vehicle exhaust pollution.
工业重要性
光催化去除NOx技术被应用于城市道路铺装和建筑外墙，是减少城市空气污染的绿色解决方案。
属性
- 可逆
- 否
- 能量
- 放热
- ΔH
- -206.0 kJ/mol
- 催化剂
- TiO₂ (titanium dioxide)
相关反应
Photochemical Smog Formation (NO₂ Photolysis)
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
Dye-Sensitized Solar Cell (Grätzel Cell)
Frequently Asked Questions
What is the equation for Photocatalytic NOx Removal?
The balanced equation is: NOₓ + O₂ + H₂O → HNO₃.
What type of reaction is Photocatalytic NOx Removal?
Photocatalytic NOx Removal is a photochemical reaction.
Is Photocatalytic NOx Removal exothermic or endothermic?
Photocatalytic NOx Removal is exothermic (releases energy). The enthalpy change (ΔH) is -206.0 kJ/mol.
What conditions are needed for Photocatalytic NOx Removal?
This reaction requires a catalyst (TiO₂ (titanium dioxide)).