Photocatalytic NOx Removal

NOx + O2 + H2O → HNO3

نظرة عامة

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.

المشاركون

الدور المادة المعامل الحالة
متفاعل Water H₂O 1 (l)
منتج Nitric Acid HNO₃ 1 (aq)

مثال من الحياة اليومية

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

الأهمية الصناعية

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

الخصائص

النوع
Photochemical
قابل للعكس
لا
الطاقة
طارد للحرارة
ΔH
-206,0 kJ/mol
محفز
TiO₂ (titanium dioxide)

التفاعلات ذات الصلة

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)).