Discussion
Statement I: A diesel engine cannot use a three-way catalyst.
Statement II: A diesel runs lean, so the exhaust contains ample oxygen throughout.
In the light of the above statements, choose the correct answer.
Answer: A
Both hold and the second is the reason: reduction of nitrogen oxides is impossible in an oxygen-rich exhaust. Separate devices are therefore needed, an oxidation catalyst for the one duty and a reduction system for the other.
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