請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/45550
標題: Comparative study of regulated and unregulated air pollutant emissions before and after conversion of automobiles from gasoline power to liquefied petroleum gas/gasoline dual-fuel retrofits
作者: Yang, H.H.
鄭曼婷
Chien, S.M.
Cheng, M.T.
Peng, C.Y.
關鍵字: polycyclic aromatic-hydrocarbons
volatile organic-compounds
exhaust
emissions
chemical-composition
alternative fuel
unleaded petrol
passenger cars
vehicles
diesel
parameters
期刊/報告no:: Environmental Science & Technology, Volume 41, Issue 24, Page(s) 8471-8476.
摘要: Liquefied petroleum gas (LPG) is increasingly being examined as an alternative to gasoline use in automobiles as interest grows in reducing air pollutant emissions. In this study, emissions of regulated (CO, THC, NO(x)) and unregulated air pollutants, including CO(2), particulate matter (PM), polycyclic aromatic hydrocarbons (PAHs), and BTEX (acronym for benzene, toluene, ethylbenzene, xylene), were measured before and after conversion of nine gasoline-powered automobiles to LPG/ gasoline dual-fuel retrofits. The tests were conducted on a standard chassis dynamometer in accordance with the United States Environmental Protection Agency FTP-75 test procedure, with the exception that all tests were conducted under hot-start driving conditions. The influences of LPG on air pollutant emission levels and carcinogenic potency were investigated and compared with gasoline. The results showed average emission factors of 0.14 g/km, 0.33 mg/km, 0.09 g/km, 0.44 g/km, and 197 g/km for CO, THC, NO,, PM, and CO(2), respectively, for LPG/ gasoline dual-fuel retrofits. Paired-sample t-test results indicated that the emissions of CO (p = 0.03), THC (p = 0.04), and CO(2) (p = 4.6 x 10(-3)) were significantly reduced with the retrofit in comparison with gasoline-powered automobiles. The reduction percentages were 71%, 89%, and 14% for CO, THC, and CO(2), respectively. The average total PAH emission factor for LPG was 217 mu g/km, which is significantly lower than gasoline (863 mu g/km; p = 0.05). The PAH corresponding carcinogenicities (BaP(eq))were calculated via toxic equivalencies based on benzo(a)pyrene (BaP). Paired-sample t-test results for total BaPeq emissions showed no significant difference between gasoline (30.0 mu g/km) and LPG (24.8 mu g/km) at a confidence level of 95%. The discrepancy between PAH and BaP(eq) emissions resulted from the higher emission percentages of high molecular weight PAHs for LPG, which might be from lubricant oil. The average emission factors of benzene, toluene, ethylbenzene, and xylene were 351, 4400, 324, and 1100 mu g/ km, respectively, with LPG as fuel, which were all significantly lower than those for gasoline (95% confidence level. The average reduction percentages were 78%, 61%, 57%, and 58% for benzene, toluene, ethylbenzene, and xylene, respectively.
URI: http://hdl.handle.net/11455/45550
ISSN: 0013-936X
文章連結: http://dx.doi.org/10.1021/es0706495
顯示於類別:環境工程學系所

文件中的檔案:
沒有與此文件相關的檔案。


在 DSpace 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。