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Catalysis

Catalysis. Catalyst : A substance that speeds up a reaction without being consumed Enzyme : A large molecule (usually a protein) that catalyzes biological reactions. Homogeneous catalyst : Present in the same phase as the reacting molecules.

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Catalysis

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  1. Catalysis • Catalyst: A substance that speeds up a reaction without being consumed • Enzyme: A large molecule (usually a protein) that catalyzes biological reactions. • Homogeneous catalyst: Present in the same phase as the reacting molecules. • Heterogeneous catalyst: Present in a different phase than the reacting molecules.

  2. Lowering of Activation Energy by a Catalyst

  3. Catalysts Increase the Number of Effective Collisions

  4. Heterogeneous Catalysis Carbon monoxide and nitrogen monoxide adsorbed on a platinum surface Step #1: Adsorption and activation of the reactants.

  5. Heterogeneous Catalysis Carbon monoxide and nitrogen monoxide arranged prior to reacting Step #2: Migration of the adsorbed reactants on the surface.

  6. Heterogeneous Catalysis Carbon dioxide and nitrogen form from previous molecules Step #3: Reaction of the adsorbed substances.

  7. Heterogeneous Catalysis Carbon dioxide and nitrogen gases escape (desorb) from the platinum surface Step #4: Escape, or desorption, of the products.

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