Discussion
Consider the following pairs of device and the pollutant it addresses:
Three-way catalyst - Carbon monoxide, hydrocarbons and nitrogen oxides
Diesel particulate filter - Soot
Carbon canister - Evaporative hydrocarbons
Exhaust gas recirculation - Carbon monoxide
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
The first three are correctly matched: the three-way catalyst treats all three regulated gases, the particulate filter traps soot, and the carbon canister holds evaporative hydrocarbons.
The fourth is wrong. Exhaust gas recirculation lowers peak flame temperature and so reduces nitrogen oxides; it does nothing for carbon monoxide, and by degrading combustion it can slightly increase it. Each device addresses the pollutant its physics acts on.
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