Nitrogen oxides can be removed from the exhaust gases of a car engine by using a catalytic converter. Many catalytic converters contain metals such as platinum and rhodium. These act as heterogeneous catalysts. a i What is meant by the term heterogeneous catalysis? ii Explain in general terms how heterogeneous catalysts work. b Nitrogen(IV) oxide and carbon monoxide from car exhausts can react in a catalytic converter. NO,(g) + CO(g) > N0(g) + CO,(g) The rate equation for this reaction is rate = k[NO,P Suggest a two-step reaction mechanism for this reaction that is consistent with this rate equation. c Nitrogen(IV) oxide is formed when nitrogen(II) oxide reacts with oxygen. 2NO(g) + 0,(g) → 2NO,(g) The table shows the data obtained from a series of experiments to investigate the kinetics of this reaction. Experiment (NO]/moldm-³ (0,1/mol dm-³ Initial rate / mol dm³s-! 1 0.00100 0.003 00 21.3 0.00100 0.004 00 28.4 3 0.003 00 0.004 00 256 i Deduce the order of reaction with respect to each reactant. In each case, show your reasoning.

Nitrogen oxides can be removed from the exhaust gases of a car engine by using a catalytic converter. Many catalytic converters contain metals such as platinum and rhodium. These act as heterogeneous catalysts. a i What is meant by the term heterogeneous catalysis? ii Explain in general terms how heterogeneous catalysts work. b Nitrogen(IV) oxide and carbon monoxide from car exhausts can react in a catalytic converter. NO,(g) + CO(g) > N0(g) + CO,(g) The rate equation for this reaction is rate = k[NO,P Suggest a two-step reaction mechanism for this reaction that is consistent with this rate equation. c Nitrogen(IV) oxide is formed when nitrogen(II) oxide reacts with oxygen. 2NO(g) + 0,(g) → 2NO,(g) The table shows the data obtained from a series of experiments to investigate the kinetics of this reaction. Experiment (NO]/moldm-³ (0,1/mol dm-³ Initial rate / mol dm³s-! 1 0.00100 0.003 00 21.3 0.00100 0.004 00 28.4 3 0.003 00 0.004 00 256 i Deduce the order of reaction with respect to each reactant. In each case, show your reasoning.

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter11: Chemical Kinetics

Section: Chapter Questions

Problem 11.99PAE: Substances that poison a catalyst pose a major concern for many engineering designs, including those...

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