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

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)).