The reduction of nitrogen dioxide by carbon monoxide in a catalytic converter occurs as follows:
CO(g)+NO2(g)⇌CO2(g)+NO(g)ΔH=−226 kJ/mol CO(g) + NO_2(g) \rightleftharpoons CO_2(g) + NO(g) \quad \Delta H = -226\text{ kJ/mol} CO(g)+NO2(g)⇌CO2(g)+NO(g)ΔH=−226 kJ/molA temperature of 400∘C400^\circ\text{C}400∘C, a pressure of 6 atm6\text{ atm}6 atm, and a platinum-based catalyst are used in this process.
The diagram shows the reaction profile if a catalyst is not used.
(i) On the diagram, draw the reaction profile when a platinum-based catalyst is used.
(ii) Label the diagram to show the enthalpy change (ΔH\Delta HΔH) and the activation energy (EcatE_{cat}Ecat) for the reaction with the catalyst.
A manufacturer carries out this reaction using the same catalyst, a pressure of 6 atm6\text{ atm}6 atm, but a temperature of 300∘C300^\circ\text{C}300∘C.
(i) State the effect of this change in temperature on the rate of the reaction.
(ii) Explain the effect of this change on the yield of nitric oxide (NONONO).
The manufacturer then carries out this reaction using the same catalyst, a temperature of 400∘C400^\circ\text{C}400∘C, but a pressure of 1.5 atm1.5\text{ atm}1.5 atm.
(i) Suggest what effect this change in pressure would have on the rate of the reaction.
(ii) Explain the effect of this change on the yield of nitric oxide (NONONO).
