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3.2 Catalysts at Work

3.2 Catalysts at Work. 3.2.1. Catalytic Converters. LO: I understand how catalytic converters work. Catalytic converters in car exhausts:. Convert harmful gases into less harmful ones. Contain platinum, palladium and rhodium. For example:. +. +. 2NO. 2NO 2. 2N 2. 3O 2. +. 2CO. O 2.

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3.2 Catalysts at Work

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  1. 3.2 Catalysts at Work 3.2.1. Catalytic Converters LO: I understand how catalytic converters work.

  2. Catalytic converters in car exhausts: • Convert harmful gases into less harmful ones. • Contain platinum, palladium and rhodium. For example: + + 2NO 2NO2 2N2 3O2 + 2CO O2 2CO2 The polluting molecules stick to the surface of the catalyst. This is called adsorption. LO: I understand how catalytic converters work.

  3. Unleaded petrol must be used. Lead sticks to the surface of the catalyst and stops the polluting molecules from adsorbing. This is known as poisoning the catalyst. LO: I understand how catalytic converters work.

  4. 3.2.2. Heterogeneous Catalysis LO: I understand what is meant by heterogeneous catalysis.

  5. different In heterogeneous catalysis, the catalyst is in a . state to the reactants. In some reactions the by-products the catalyst. Ostwald process Ammonia + oxygen Platinum Nitric acid Haber process Nitrogen and hydrogen Iron Ammonia Vegetable oil and hydrogen Hydrogenation Nickel Margarine Contact process Sulphur dioxide and oxygen Vanadium pentoxide Sulphuric acid poison The catalyst must be . regenerated LO: I understand what is meant by heterogeneous catalysis.

  6. 3.2.3. Homogeneous Catalysis LO: I understand what is meant by homogeneous catalysis.

  7. same In homogeneous catalysis, the catalyst is in the . state to the reactants. Enzymes are catalysts that speed up certain reactions by homogeneous catalysis glucose + fructose confectionary yeast grape juice wine yoghurt bacteria brewing grain sugars biological LO: I understand what is meant by homogeneous catalysis.

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