Challenges in Control of Emission from Automotive Exhaust

Challenges in Control of Emission from Automotive Exhaust 

Oxidative catalytic converters are used to reduce CO and HCs originating from imperfect combustion in engines. At certain temperatures, these converters may also oxidize NO to NO2. Original equipment manufacturer (OEM) particle filters (PFs) employ NO2 to oxidize trapped soot at lower temperatures. However, the excess NO2 may escape from the system as tailpipe emissions. NO2 is very toxic to humans, and it also has impacts on atmospheric ozone-forming chemistry. Alvaraz et al. have stated that the primary NO2 emissions of modern diesel cars are increasing [76]. 

Diesel and gasoline exhaust gas purification has drawn increasing attention. Catalyst materials containing different noble metals, such as Pd, Pt, and Rh, 

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