25-Chem360 Spring 2017 - Prelecture filled out.pptx

25-Chem360 Spring 2017 - Prelecture filled out.pptx -...

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Alternative Fuels-Hydrogen (P320) Hydrogen-oxygen fuel cell ( P328- P334 ) Mei Shen Chem 360 124 Burrill 27 March 2017 1
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Goals for Today 2 Alternative Fuels-Hydrogen (storage) Hydrogen-oxygen fuel cells Definition & Reactions Diagram Real world Application Environmental benefits
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News 3 Homework #5 posted, due next Monday before class started (April 3 th ) 3 PM
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Hydrogen storage 4 Liquid compressed gas Boiling point: -253 ◦C, need energy to compress and keep T low When lightness dominant, used A much greater amount needs to be stored to release the same amount of energy than methane. CH 4 (g) + 2 O 2 (g) CO 2 (g) + 2 H 2 O (l) ∆H = -890 kJ/mol H 2 (g) + ½ O 2 (g) H 2 O (l) ∆H = -242 kJ/mol P=700 atm, density 37kg/m 3
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Hydrogen storage 5 Metal Alloys Many metals, alloys, chemically absorb large amounts of H2 reversibly The molecular form of hydrogen becomes dissociated into atoms at the surface of metal as it is absorbed Forms metal hydrides by incorporating small atoms of hydrogen in “holes” in the crystal structure of the metal.
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