Lesson_30 - Catalysis A catalyst increases the rate of...

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Lesson 30 Catalysis A catalyst increases the rate of reaction by providing a different reaction path with lower activation energy The catalyst participates in the reaction, but it is not altered by the reaction Therefore, the catalyst does not appear in the overall chemical reaction as a reagent or product Catalysts are classified as homogeneous or heterogeneous
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Lesson 30 Homogeneous Catalysis A homogeneous catalysts is dissolved in the reaction medium throughout the reaction. Consider the following decomposition reaction:
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Lesson 30 An example of homogeneous catalysis. HCOOH → H 2 O + CO
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Heterogeneous catalysis Heterogeneous catalysts are solids that speed up the reaction rates of gas or liquid reagents The steps involved in most heterogeneous-catalyzed reactions are: Adsorption of reagents on the catalyst surface Diffusion of reagents on the catalyst surface Reaction on an active site to form products Desorption of the product into the gas or liquid phase
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This note was uploaded on 04/13/2009 for the course CHEMISTRY 102 taught by Professor Soares during the Spring '09 term at Waterloo.

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Lesson_30 - Catalysis A catalyst increases the rate of...

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