Lec15_Fuel_and_CO2

Lec15_Fuel_and_CO2 - CHEM/ENVS 380, April 8, 2010 1. How do...

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Atmosphere Fuel-3 CHEM/ENVS 380, April 8, 2010 Fuel-2 Fuel-1 Fuel CAPTURE EMISSIONS Zero to low emissions Broecker, Science, 315, 1371, 2007. 1. How do you compare multiple fossil fuels in terms of energy and pollutant yields? 2. How is energy yield of a fuel related to its oxidation state? 3. What kind of CO 2 sequestration methods are currently being explored? Pros? Cons? 4. How do the different sequestration scenarios differ in storage capacity and the time scale involved ? Lecture 15: Fossil Fuel Energy and CO 2 Emissions
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mol O   2 /mol fuel  ΔH rxn 0      CO   2 /kJ heat released Coal Oil Methane Which is “best”: coal, oil, or methane (Prob. 7-3, 7-4)? C + O 2 CO 2 coal combustion CH 2 + 1.5 O 2 CO 2 + H 2 O oil combustion CH 4 + 2 O 2 CO 2 + 2 H 2 O methane combustion Standard enthalpies of formation, ΔH f 0 (kJ/mol): CH 4 -74.9 CO 2 (gas) -393.5 H 2 O (liq) -285.8 CH 2 -20.6 O 2 , C (graphite) 0.0 Oxidation Number of C -4 +4 0
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What makes one fossil fuel better than another? Energy yield: – Per mole of fuel Per unit mass of fuel Per unit volume of fuel Production of harmful by-products Reaction ΔH rxn 0 (kJ) MW of fuel kJ/g fuel kJ/CO 2 C + O 2 CO 2 -393.5 CH 2 + 1.5 O 2 CO 2 + H 2 O -658.7
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This note was uploaded on 09/23/2011 for the course CHEM 380 taught by Professor Staff during the Spring '11 term at S.F. State.

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Lec15_Fuel_and_CO2 - CHEM/ENVS 380, April 8, 2010 1. How do...

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