Example: Oxidation of carbon monoxide CO oH +o> CO, +HO HO+NO→>NO2+OH no t hy>NO +o Q+Q2+M→Q3+M Net: co+20+hv>CO+o The net reaction can be viewed as a catalytic oxidation of Co to co. Net formation of o, occurs
Example: Oxidation of carbon monoxide CO + .OH + O2 → CO2 + HO2 . HO2 . + NO → NO2 + .OH NO2 + hv → NO + O O + O2 + M → O3 + M Net: CO + 2 O2 + hv → CO2 + O3 The net reaction can be viewed as a catalytic oxidation of CO to CO2 . Net formation of O3 occurs
Example: Oxidation of methane CH4+ oH+02> CH300+H20 CH30O+NO→CH3O.+NO2 CH3O+O2→HCHO+HO2 HO2+No> OH+NO2 NO2 hv>NO+O(x O+O2+M→03+M(2x) Net: CH4+402 HCHo +H20+2 03 The net reaction is that for each mole of methane oxidized 2 moles of 03 is produced
Example: Oxidation of methane CH4 + .OH + O2 → CH3OO. + H2O CH3OO. + NO → CH3O. + NO2 CH3O. + O2 → HCHO + HO2. HO2. + NO → .OH + NO2 NO2 + hn → NO + O (2x) O + O2 + M → O3 + M (2x) Net: CH4 + 4 O2 → HCHO + H2O + 2 O3 The net reaction is that for each mole of methane oxidized, 2 moles of O3 is produced
Necessary ingredients for ozone formation Sunlight Production of o atom NOX(NO, NO2) Hydrocarbons (VOCs: volatile organic carbon Production of ro2, which reacts with No so that o3 could accumulate VOCS+ NOx hv>03+ other pollutants
Necessary ingredients for ozone formation • Sunlight • NOx (NO, NO2) • Hydrocarbons (VOCs: volatile organic carbon) VOCs + NOx + hn → O3 + other pollutants Production of O atom Production of RO2, which reacts with NO so that O3 could accumulate