14-Chem360 Spring 2017 - Prelecture filled out.pptx

14-Chem360 Spring 2017 - Prelecture filled out.pptx - The...

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The Chemistry of ground-level air pollution Mei Shen Chem 360 124 Burrill 20 Feb 2017 1
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News 2 Homework #3 posted, due next Monday before class started (Feb 27 th ) 3 PM
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review 3 pollutant in exhaust NOx VOCs (hydrocabons) CO This is why we need catalytic converters - 2-way Carbons containing - 3-way targets all three Cleaner gases NOx -> N 2 CO CO 2 VOCs(HmCn) -> H 2 O + CO 2 3
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Review 2 CO + O 2 -> 2 CO 2 C=+2 O=0 C= +4 O=-2 Oxygen gained 2x2=4e- Carbon lose 4e- 4 (VOC) CnHm +( n+ m/4)O2 -> n CO2 + m/2 H2O
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Review NOx: H2 2NO + 2H 2 -> N 2 + 2H 2 0 CO 2NO + 2CO -> N 2 + 2CO 2 CnHm 2NO + 2C 6 H 6 -> N 2 + 2C 6 H 6 O 5
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Goals for Today 6 Stoichiometric ratio of catalytic converter Catalytic converter for diesel engines Air quality standard (p94-96)
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Topic #1: Stoichiometric ratio of catalytic converter 7
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Catalytic converters-Stoichiometric ratio 8 Oxygen sensors in the vehicles’ exhaust system are monitored by a computer chip: controls the intake air/fuel ratio of the engine to the stoichiometric amount required by the fuel in order to ensure a high level of conversion of pollutants.
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