Method(s) to reduce emissions
SO2
Pre-combustion methods
→ hydrodesulfurization: production of HS instead of SO2 which can then be recaptured to form sulfur
Post-combustion methods
→ flue gas treatment : running SO2 gas through CaO to capture CaSO4
CaO(s) + SO2(g) → CaSO3(s)
CaCO3(s) + SO2(g) → CaSO3(s) + CO2(g)
2CaSO3(s) + O2(g) → 2CaSO4(s)
NOx
Catalytic converters in vehicles
→ conversion of NO to N2 and O2, conversion of CO and hydrocarbons to CO2 and H2O
Three reactions of the catalytic converter:
1. NO → N2 + O2
1. 2CO + O2 → 2CO2
1. CxH2y + (x+ ½y)O2 → xCO2 + yH2O*
*for a generic hydrocarbon
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