54-ME4211 - 4.1 Criteria on the Photochemical Ozone...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
4.1 Criteria on the Photochemical Ozone Formation When solvents and other volatile organic compounds or VOCs are released to the atmosphere, they are often degrade d within a few days. The reaction involved is an oxidation , which occurs under the influence of light from the sun. In the presence of nitrogen oxides ( NO x ), ozone can be formed . The oxides of nitrogen are not consumed during ozone formation, but have a catalyst like function . This process is termed photochemical ozone formation. NO2(g)  NO(g) + O(g) (i) Oxygen atoms are very reactive and combine with O2 in air to produce O3 . O(g) + O2(g)  O3(g) (ii) O3 formed in (ii) reacts rapidly with NO(g) formed in (i) to regenerate NO2. NO(g) + O3(g)  NO2(g) + O2(g) (iii) 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The VOCs are broken down especially in the troposphere , the lowest region of the atmosphere, to which they are emitted. The most significant man-made sources of VOCs are road transport with its emission of unburnt petrol and diesel and the use of organic solvents , e.g. in paints. 2
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/07/2011 for the course ME ME4211 taught by Professor Dr.a.vyas during the Winter '11 term at NYU Poly.

Page1 / 4

54-ME4211 - 4.1 Criteria on the Photochemical Ozone...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online