Quantification of temperature dependence of vehicle evaporative volatile organic compound emissions from different fuel types in China

Huang, Jian; Yuan, Zibing; Duan, Yusen; Liu, Dengguo; Fu, Qingyan; Liang, Guoping; Li, Fang; Huang, Xin

doi:10.1016/j.scitotenv.2021.152661

Cited by 17 publications

(11 citation statements)

References 46 publications

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“…These ratios may not be able to be used as indicators to distinguish gasoline and diesel vehicles in ambient studies since secondary sources may complicate the observed ratios in ambient air. However, these results strongly suggest that diesel vehicles can be important in emissions of these OVOC species, though the number of diesel vehicles are smaller than gasoline vehicles in many countries, e.g., China and USA (Wallington et al, 2013;Yao et al, 2015;Huang et al, 2021).…”

Section: Non-target Analysis For Comparison Between Gasoline and Dies...mentioning

confidence: 98%

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Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles

Wang

Yuan

et al. 2022

Atmos. Chem. Phys.

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Abstract. Vehicular emissions are an important source for volatile organic compounds (VOCs) in urban and downwind regions. In this study, we conducted a chassis dynamometer study to investigate VOC emissions from vehicles using gasoline, diesel, and liquefied petroleum gas (LPG) as fuel. Time-resolved VOC emissions from vehicles are chemically characterized by a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) with high frequency. Our results show that emission factors of VOCs generally decrease with the improvement of emission standards for gasoline vehicles, whereas variations in emission factors for diesel vehicles with emission standards are more diverse. Mass spectrum analysis of the PTR-ToF-MS suggests that cold starts significantly influence VOC emissions of gasoline vehicles, while the influences are less important for diesel vehicles. Large differences in VOC emissions between gasoline and diesel vehicles are observed with emission factors of most VOC species from diesel vehicles being higher than gasoline vehicles, especially for most oxygenated volatile organic compounds (OVOCs) and heavier aromatics. These results indicate quantification of heavier species by the PTR-ToF-MS may be important in the characterization of vehicular exhausts. Our results suggest that VOC pairs (e.g., C14 aromatics / toluene ratio) could potentially provide good indicators for distinguishing emissions from gasoline and diesel vehicles. The fractions of OVOCs in total VOC emissions are determined by combining measurements of hydrocarbons from canisters and online observations of the PTR-ToF-MS. We show that OVOCs contribute 9.4 % ± 5.6 % of total VOC emissions for gasoline vehicles, while the fractions are significantly higher for diesel vehicles (52 %–71 %), highlighting the importance of detecting these OVOC species in diesel emissions. Our study demonstrated that the large number of OVOC species measured by the PTR-ToF-MS are important in the characterization of VOC emissions from vehicles.

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Section: Non-target Analysis For Comparison Between Gasoline and Dies...mentioning

confidence: 98%

“…It should be noted that the OVOC fractions obtained here only reflect exhaust emissions. Evaporative emissions may also be associated with different fractions of various VOC groups, which may be more related to fuel compositions (Rubin et al, 2006;Huang et al, 2021).…”

Section: Ovoc Fractions In Voc Emissionsmentioning

confidence: 99%

Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles

Wang

Yuan

et al. 2022

Atmos. Chem. Phys.

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show abstract

“…However, these results strongly suggest that diesel vehicles can be important in emissions of these OVOC species, though the number of diesel vehicles are smaller than gasoline vehicles in many countries, e.g. China and U.S (Wallington et al, 2013;Yao et al, 2015;Huang et al, 2021). vehicles (84% ± 5.9%), and lower fractions in diesel (47% ± 16%) and LPG vehicles (32% ± 0.7%).…”

Section: The Above Discussion Demonstrate That Emission Characteristi...mentioning

confidence: 94%

“…For the MDDT and HDDT, we customized a step-by-step test method, in which the vehicle accelerates to 20 km•h -1 , 40 km•h -1 and 60 km•h -1 in sequence after the engine activates, keeping at 20 km•h -1 and 40 km•h -1 for 2 minutes, and 60 km•h -1 for 1 minute, respectively (Fig. S1) Liu et al, 2021;Liao et al, 2021). In addition, the cold start was tested for a number of vehicles after a cold soak for more than 12 hours at ambient temperature A custom-built sampling and dilution system for vehicles combining online and offline sampling techniques was used in this study.…”

Section: Tested Vehicles and The Chassis Dynamometer Study Methodsmentioning

confidence: 99%

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Oxygenated VOCs as significant but varied contributors to VOC emissions from vehicles

Wang

Yuan

et al. 2022

Preprint

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Abstract. Vehicular emission is an important source for volatile organic compounds (VOCs) in urban and downwind regions. In this study, we conducted a chassis dynamometer study to investigate VOC emissions from vehicles using gasoline, diesel, and liquefied petroleum gas (LPG) as fuel. Time-resolved VOC emissions from vehicles are chemically characterized by a proton-transfer-reaction time-of-flight mass spectrometry (PTR-ToF-MS) with high frequency. Our results show that emission factors of VOCs generally decrease with the improvement of emission standard for gasoline vehicles, whereas variations of emission factors for diesel vehicles with emission standards are more diverse. Mass spectra analysis of PTR-ToF-MS suggest that cold start significantly influence VOCs emission of gasoline vehicles, while the influences are less important for diesel vehicles. Large differences of VOC emissions between gasoline and diesel vehicles are observed with emission factors of most VOC species from diesel vehicles were higher than gasoline vehicles, especially for most oxygenated volatile organic compounds (OVOCs) and heavier aromatics. These results indicate quantification of heavier species by PTR-ToF-MS may be important in characterization of vehicular exhausts. Our results suggest that VOC pairs (e.g. C14 aromatics/toluene ratio) could potentially provide good indicators for distinguishing emissions from gasoline and diesel vehicles. The fractions of OVOCs in total VOC emissions are determined by combining measurements of hydrocarbons from canisters and online observations of PTR-ToF-MS. We show that OVOCs contribute 7.7 % ± 6.2 % of gasoline vehicles of the total VOC emissions, while the fractions are significantly higher for diesel vehicles (40–77 %), highlighting the importance to detect these OVOC species in diesel emissions. Our study demonstrated that the large number of OVOC species measured by PTR-ToF-MS are important in characterization of VOC emissions from vehicles.

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Bibliometric analysis of research hotspots and trends in the field of volatile organic compound (VOC) emission accounting

Huang,

Xiao,

et al. 2024

Environ Sci Pollut Res

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Quantification of temperature dependence of vehicle evaporative volatile organic compound emissions from different fuel types in China

Cited by 17 publications

References 46 publications

Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles

Oxygenated volatile organic compounds (VOCs) as significant but varied contributors to VOC emissions from vehicles

Oxygenated VOCs as significant but varied contributors to VOC emissions from vehicles

Bibliometric analysis of research hotspots and trends in the field of volatile organic compound (VOC) emission accounting

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