My OpenLearn Profile
- Personalise your OpenLearn profile
- Save your favourite content
- Get recognition for your learning
The three-way catalytic converter
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.
Course 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.
First Published: 09/08/2012
You can start this course right now without signing-up. Click on any of the course content sections below to start at any point in this course.
If you want to be able to track your progress, earn a free Statement of Participation, and access all course quizzes and activities, sign-up.
- 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
Create an account to get more
Track your progress
Review and track your learning through your OpenLearn Profile.
Statement of Participation
On completion of a course you will earn a Statement of Participation.
Access all course activities
Take course quizzes and access all learning.
Review the course
When you have finished a course leave a review and tell others what you think.
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 conditions377 and our FAQs378.
Full copyright details can be found in the Acknowledgements section of each week.
For further information, take a look at our frequently asked questions which may give you the support you need.Have a question?
Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses372.
If you are new to university level study, we offer two introductory routes to our qualifications. Find out Where to take your learning next?373 You could either choose to start with an Access courses374or an open box module, which allows you to count your previous learning towards an Open University qualification.
Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.
About this free course
12 hours study
Level 3: Advanced
Download this course
Free statement of participation on completion of these courses.