Lecture 36 112108 - Road Map Cover Chapter 12: Today,...

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Road Map Cover Chapter 12: Today, 11/21, Monday 11/24, and Wednesday 11/26 Cover Chapter 13 (first few sections): Monday 12/1, Wednesday 12/3 and Friday 12/5 FINAL EXAM: Monday December 8, 10AM-noon, room to be announced
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Homework Announcements Homework on Chapter 10 due Monday, November 24 at 11:59PM Homework on Chapter 11 due Wednesday December 3 at 11:59PM Homework on Chapter 12 due Wednesday, December 3 at 11:59 PM Homework on Chapter 13 due Monday, December 8 at 11:59 PM
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Catalysis A catalyst is a substance that increases the rate of a reaction but is neither created nor destroyed in the process. Three properties of a catalyst. Catalysts are not part of the reaction stoichiometry. Catalysts are not consumed by the reaction. Catalysts increase the rate of the net reaction.
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Two Broad Categories of Catalysts Homogeneous catalysts are in the same phase as the reacting substances. Homogeneous catalysts are consumed by a reactant in one elementary step and regenerated as a product in a later elementary step. Heterogeneous catalysts are in a different phase than the reacting species. The reactive species adsorb or stick onto the surface of the catalyst. Species migrate on the surface until they encounter each other. The reaction takes place on the surface. The products desorb from the catalyst surface.
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Heterogeneous Catalysis A schematic model of the steps involved in the catalytic removal of NO from exhaust gas.
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Molecular Perspective of Catalysis Catalysts increase the rate of reaction by providing a new reaction pathway that lowers the activation energy. For a lowered activation energy, a larger fraction of molecules have speeds that are high enough to provide the needed energy to overcome the activation barrier.
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Catalysts increase the rate of reaction by providing an alternative reaction pathway with lower activation energy.
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Lecture 36 112108 - Road Map Cover Chapter 12: Today,...

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