effectiveness of replacing catalytic converters in lpg-fueled vehicles in hong kong
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2016
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Abstract
Many taxis and public buses are powered by liquefied petroleum gas (LPG) in
Hong Kong. With more vehicles using LPG, they have become the major
contributor to ambient volatile organic compounds (VOCs) in Hong Kong. An
intervention program which aimed to reduce the emissions of VOCs and nitrogen
oxides (NOx) from LPG-fueled vehicles was implemented by the Hong Kong
government in September 2013. Long-term real-time measurements indicated
that the program was remarkably effective in reducing LPG-related VOCs,
NOx and nitric oxide (NO) in the atmosphere. Receptor modeling results
further revealed that propane, propene, i-butane, n-butane and NO in
LPG-fueled vehicle exhaust emissions decreased by 40.8 ± 0.1,
45.7 ± 0.2, 35.7 ± 0.1, 47.8 ± 0.1 and
88.6 ± 0.7 %, respectively, during the implementation of the program.
In contrast, despite the reduction of VOCs and NOx, O3 following
the program increased by 0.40 ± 0.03 ppbv (∼ 5.6 %).
The LPG-fueled vehicle exhaust was generally destructive to OH and HO2.
However, the destruction effect weakened for OH and it even turned to
positive contribution to HO2 during the program. These changes led to
the increases of OH, HO2 and HO2 ∕ OH ratio, which might explain the
positive O3 increment. Analysis of O3–VOCs–NOx sensitivity in
ambient air indicated VOC-limited regimes in the O3 formation before
and during the program. Moreover, a maximum reduction percentage of NOx
(i.e., 69 %) and the lowest reduction ratio of VOCs ∕ NOx (i.e., 1.1) in
LPG-fueled vehicle exhaust were determined to give a zero O3 increment.
The findings are of great help to future formulation and implementation of
control strategies on vehicle emissions in Hong Kong, and could be extended
to other regions in China and around the world.
| Reference Key |
lyu2016atmosphericeffectiveness
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|---|---|
| Authors | ;X. Lyu;H. Guo;I. J. Simpson;S. Meinardi;P. K. K. Louie;Z. Ling;Y. Wang;M. Liu;C. W. Y. Luk;N. Wang;D. R. Blake |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-6609-2016
|
| URL | |
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