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Catalysts
Inorganic
A2
Transition Metals
AQA Content
Explain the importance of variable oxidation states in catalysis
Explain, with the aid of equations, how V2O5 acts as a catalyst in the Contact process
Explain, with the aid of equations, how Fe2+ ions catalyse the reaction between I− and S2O82–
Explain, with the aid of equations, how Mn2+ ions autocatalyse the reaction between C2O42– and MnO4–
Specification Notes
Transition metals and their compounds can act as heterogeneous and homogeneous catalysts.
A heterogeneous catalyst is in a different phase from the reactants and the reaction occurs at active sites on the surface.
The use of a support medium to maximise the surface area of a heterogeneous catalyst and minimise the cost.
V2O5 acts as a heterogeneous catalyst in the Contact process.
Fe is used as a heterogeneous catalyst in the Haber process.
Heterogeneous catalysts can become poisoned by impurities that block the active sites and consequently have reduced efficiency; this has a cost implication.
A homogeneous catalyst is in the same phase as the reactants.
When catalysts and reactants are in the same phase, the reaction proceeds through an intermediate species.
Notes
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