Photocatalytic NOx Removal
NOx + O2 + H2O → HNO3
Visão geral
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.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Reagente | Water H₂O | 1 | (l) |
| Produto | Nitric Acid HNO₃ | 1 | (aq) |
Exemplo do cotidiano
Some cities use photocatalytic concrete in roads and buildings that actively clean the air of vehicle exhaust pollution.
Importância industrial
Os materiais de construção fotocatalíticos representam um mercado em crescimento para a melhoria da qualidade do ar em ambientes urbanos.
Propriedades
- Tipo
- Photochemical
- Reversível
- Não
- Energia
- Exotérmico
- ΔH
- -206,0 kJ/mol
- Catalisador
- TiO₂ (titanium dioxide)
Reações relacionadas
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)).