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The three-way catalytic converter
The three-way catalytic converter

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The three-way catalytic converter

Learning outcomes

After studying this course, you should be able to:

  • discuss how the gas mixture expelled from the engine, and the conversion performance of the three-way catalytic converter, depend on the air/fuel (A/F) ratio

  • list the chemical reactions whereby the three-way catalyst removes carbon monoxide (CO), hydrocarbons and oxides of nitrogen (NOx) from petrol vehicle exhausts

  • interpret the results of experimental studies (involving activity tests, kinetic measurements, adsorption studies and/or various surface science techniques) of the three-way catalyst and appropriate model systems

  • discuss possible mechanisms for the catalytic reactions removing CO, hydrocarbons and NOx from vehicle exhausts

  • outline the modes of deterioration of the three-way catalyst, and comment on the strategies that could be used to reduce H2S emissions.

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