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Explain that catalysts can be homogeneous or heterogeneous.
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Describe the mode of action of a heterogeneous catalyst, including adsorption of reactants, bond weakening and desorption of products, for example: (a) iron in the Haber process; (b) palladium, platinum and rhodium in the catalytic removal of oxides of nitrogen from the exhaust gases of car engines.
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Describe the mode of action of a homogeneous catalyst, which is used in one step and reformed in a later step, for example: (a) atmospheric oxides of nitrogen in the oxidation of atmospheric sulfur dioxide; (b) Fe²⁺ or Fe³⁺ in the I⁻/S₂O₈²⁻ reaction.
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