Automobile Emission Control
Government regulations require that automobile manufacturers control the amount of carbon monoxide, hydrocarbons, and nitric oxide in the exhaust of vehicles.
Unburnt hydrocarbons from crevices and/or “cold” walls
NO from atmospheric N2 reaction with O at high temp
CO from incomplete combustion at fuel rich conditions
These issues are not as much fuel quality related, as inherent difficulties in combustion engine design.
“end-of-pipe” treatment is currently the best solution