Photocatalytic NOx Removal

NOx + O2 + H2O → HNO3

Обзор

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.

Участники

Роль Вещество Коэффициент Состояние
Реагент Water H₂O 1 (l)
Продукт Nitric Acid HNO₃ 1 (aq)

Пример из жизни

Some cities use photocatalytic concrete in roads and buildings that actively clean the air of vehicle exhaust pollution.

Промышленное значение

Photocatalytic construction materials represent a growing market for air quality improvement in urban environments.

Свойства

Тип
Photochemical
Обратимая
Нет
Энергия
Экзотермическая
ΔH
-206,0 kJ/mol
Катализатор
TiO₂ (titanium dioxide)

Связанные реакции

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)).