lec23 - Lecture 23 Thursday 4/1/08 OCNB Explosion Noble...

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Unformatted text preview: Lecture 23 Thursday 4/1/08 OCNB Explosion Noble Prize 2007 Catalytic Steps pW W pB B pA A rx A C N C N C N DH V r T T UA dt dT + + +- = ) )( ( ) ( p r g NC Q Q dt dT- = 9:55 t = 0 10:40 10:50 midnight 12:18 Isothermal Operation Cooling Restored Q r = 0 200 175 400 Temperature o C Temperature-time trajectory fuse Catalysts and Catalysis A Catalyst is a substance that affects the rate of chemical reaction but emerges from the process unchanged. Catalysis is the occurrence, study, and use of catalysts and catalytic processes. Approximately 1/3 of the GNP of materials produced in the U.S. involves a catalytic process. Catalysts affect both Selectivity and Yeild Steps in a Catalytic Reaction Active Site • Reactions are not catalyzed over the entire surface but only at certain active sites or centers that result from unsaturated atoms in the surface. • An active site is a point on the surface that can form strong chemical bonds with an adsorbed atom or molecule. The Adsorption Step The Surface Reaction Step...
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This note was uploaded on 09/28/2011 for the course CHEMICAL E 534 taught by Professor Fogler during the Spring '11 term at University of Michigan-Dearborn.

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lec23 - Lecture 23 Thursday 4/1/08 OCNB Explosion Noble...

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