Discussion
A three-way catalyst works well on a diesel engine because diesel exhaust is clean. Is this correct?
Answer: C
Correct answer: No, its oxygen-rich exhaust prevents nitrogen oxide reduction
A diesel runs lean, so its exhaust carries substantial oxygen throughout. Oxidation proceeds readily in it, but reduction cannot compete with the oxygen present.
The catalyst's third function therefore fails, and the device is not used on diesels. Low sulphur helps every aftertreatment device but does not create the missing chemistry, and diesel exhaust is generally cooler than a petrol engine's rather than hotter - which is a separate difficulty for light-off.
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