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In this work, an experimental study was conducted on a spark ignition (SI) vehicle fuelled on
compressed natural gas (CNG), and gasoline to compare the unregulated emissions such as volatile
organic compounds (VOCs) and aldehyde-ketones or carbonyls. In the meantime, ozone forming
potential (OFP) of pollutants was also calculated on the basis of their specific reactivity (SR). The
vehicle was run on a chassis dynamometer following the Chinese National Standards test scheduled
for light duty vehicle (LDV) emissions. According to the results, total aldehyde-ketones were increased
by 39.4% due to the substantial increase in formaldehyde and acrolein+acetone emissions, while
VOCs and BTEX (benzene, toluene, ethyl benzene, and xylene) reduced by 85.2 and 86% respectively,
in case of CNG fuelled vehicle as compared to gasoline vehicle. Although total aldehyde-ketones were
higher with CNG relative to gasoline, their SR was lower due decrease in acetaldehyde,
propionaldehyde, crotonaldehyde, and methacrolein species having higher maximum incremental
reactivity (MIR) values. The SR of VOCs and aldehyde-ketones emitted from CNG fuelled vehicle was
decreased by above 10% and 32% respectively, owing to better physicochemical properties and more
complete burning of CNG as compared to gasoline.
Asad Naeem Shah, Ge Yun-shan, Tan Jian-wei, Wang Jun-fang. (2012) A Comparative Study on VOCs and Aldehyde-Ketone Emissions from a Spark Ignition Vehicle Fuelled on Compressed Natural Gas and Gasoline, Pakistan Journal of Engineering and Applied Sciences, Volume 10, Issue 1.
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