Photocatalytic NOx Removal
NOx + O2 + H2O → HNO3
Übersicht
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.
Teilnehmer
| Rolle | Substanz | Koeffizient | Zustand |
|---|---|---|---|
| Reaktant | Water H₂O | 1 | (l) |
| Produkt | Nitric Acid HNO₃ | 1 | (aq) |
Alltägliches Beispiel
Some cities use photocatalytic concrete in roads and buildings that actively clean the air of vehicle exhaust pollution.
Industrielle Bedeutung
Photocatalytic construction materials represent a growing market for air quality improvement in urban environments.
Eigenschaften
- Typ
- Photochemical
- Reversibel
- Nein
- Energie
- Exotherm
- ΔH
- -206,0 kJ/mol
- Katalysator
- TiO₂ (titanium dioxide)
Verwandte Reaktionen
Cis-Trans Isomerization of Retinal
Silver Chloride Photodecomposition
Luminol Chemiluminescence
Firefly Bioluminescence (Luciferin Oxidation)
Photolysis of Water (Vacuum UV)
Photochemical Smog Formation (NO₂ Photolysis)
Photodegradation of Methylene Blue by TiO₂
Photodissociation of Chlorine Gas
Silver Bromide Photodecomposition
Chlorophyll Fluorescence
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)).