Photocatalytic NOx Removal

NOx + O2 + H2O → HNO3

개요

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.

참여 물질

역할 물질 계수 상태
반응물 Water H₂O 1 (l)
생성물 Nitric Acid HNO₃ 1 (aq)

일상 속 예시

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

산업적 중요성

광촉매 건축 자재는 도시 환경의 대기질 개선을 위한 성장하는 시장을 대표합니다.

성질

유형
Photochemical
가역 반응
아니오
에너지
발열
ΔH
-206.0 kJ/mol
촉매
TiO₂ (titanium dioxide)

관련 반응

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)).