Photocatalytic NOx Removal

NO_x + O₂ + H₂O → HNO₃

अवलोकन

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.

प्रतिभागी

भूमिका	पदार्थ	गुणांक	अवस्था
अभिकारक	Water H₂O	1	(l)
उत्पाद	Nitric Acid HNO₃	1	(aq)

रोजमर्रा का उदाहरण

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

औद्योगिक महत्व

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

गुण

प्रकार: Photochemical
प्रतिवर्ती: नहीं
ऊर्जा: ऊष्माक्षेपी
ΔH: -206.0 kJ/mol
उत्प्रेरक: TiO₂ (titanium dioxide)

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)).