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This free course is concerned primarily with the chemistry that underpins the operation of the three-way catalytic converter that is placed in the exhaust systems of motor vehicles in order to reduce the emissions of primary pollutants: carbon monoxide, oxides of nitrogen and volatile organic compounds, including hydrocarbons. Discussion of the various effects of these pollutants and the consequent introduction and refinement of 'automotive emission regulations' has not been included, nor is there a look forward to future research trends.
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.
- Current section: Introduction
- Learning outcomes
- 1. Overview
- 4.1 Exhaust pollutants
- 4.2 The three-way catalytic converter
- 4.3 Exhaust emission characteristics
- 4.4 The chemical reactions
- 4.5 Catalyst deterioration
- Keep on learning
Study this free course
Enrol to access the full course, get recognition for the skills you learn, track your progress and on completion gain a statement of participation to demonstrate your learning to others. Make your learning visible!
The three-way catalytic converter
Ensuring good quality air is essential for the protection of public health. Governments worldwide have adopted a range of increasingly demanding measures to curb air pollution with a particular focus on the emissions from motor vehicles. An important part of this strategy has been the development of the three-way catalytic converter to remove exhaust pollutants such as carbon monoxide, unburnt hydrocarbons and nitrogen oxides. This course takes an in-depth look at the construction of this converter for petrol-driven vehicles and investigates the catalytic chemistry taking place at the molecular level. It is assumed that you already have a scientific background.
This OpenLearn course provides a sample of Level 3 study in.
This free course includes adapted extracts from an Open University course which is no longer available to new students. If you found this interesting you could explore more free Chemistry courses or view the range of currently available OU Chemistry courses.
Copyright & revisions
Originally published: Wednesday, 2nd March 2016
Last updated on: Wednesday, 2nd March 2016
- Creative-Commons: The Open University is proud to release this free course under a Creative Commons licence. However, any third-party materials featured within it are used with permission and are not ours to give away. These materials are not subject to the Creative Commons licence. See terms and conditions. Full details can be found in the Acknowledgements and our FAQs section.
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