Photocatalytic NOx Removal
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NOx + O2 + H2O → HNO3
概要
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.
参加者
| 役割 | 物質 | 係数 | 状態 |
|---|---|---|---|
| 反応物 | Water H₂O | 1 | (l) |
| 生成物 | Nitric Acid HNO₃ | 1 | (aq) |
日常の例
Some cities use photocatalytic concrete in roads and buildings that actively clean the air of vehicle exhaust pollution.
産業上の重要性
光触媒建設材料は都市環境における大気質改善のための成長市場を形成している。
特性
- タイプ
- Photochemical
- 可逆的
- いいえ
- エネルギー
- 発熱性
- ΔH
- -206.0 kJ/mol
- 触媒
- TiO₂ (titanium dioxide)
関連する反応
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)).