Discussion
Which of the following is not converted by a three-way catalyst?
Answer: B
Correct answer: Carbon dioxide
Carbon dioxide is a product of the catalyst's work, not a target of it. Oxidising carbon monoxide and hydrocarbons produces carbon dioxide and water, so the converter increases it.
The other three are exactly what the device is named for: the three ways are oxidation of carbon monoxide, oxidation of hydrocarbons and reduction of nitrogen oxides. Reducing carbon dioxide is a matter of burning less fuel, which is an engine efficiency question rather than an aftertreatment one.
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