Effect of oxygenated fuels on physicochemical and toxicological characteristics of diesel particulate emissions.
A systematic study was conducted to make a comparative evaluation of the effects of blending five different oxygenates (diglyme (DGM), palm oil methyl ester (PME), dimethyl carbonate (DMC), diethyl adipate (DEA), and butanol (Bu)) with ultralow sulfur diesel (ULSD) at 2% and 4% oxygen levels on physicochemical and toxicological characteristics of particulate emissions from a nonroad diesel engine. All blended fuels led to an overall decrease in the particulate mass concentration and elemental carbon (EC) emissions, which was strongly associated with the oxygen content in fuels and the specific type of fuels used. In general, the proportion of particulate-bound organic carbon (OC) and water-soluble organic carbon (WSOC) increased while using oxygenated fuel blends. Compared to ULSD, all fuel blends showed different emission factors of particle-phase PAHs and n-alkanes, slight alterations in soot nanostructure, lower soot ignition temperature, and lower activation energy. The total counts of particles (≤ 560 nm diameter) emitted decreased gradually for ULSD blended with DMC, DEA, and Bu, while they increased significantly for other fuel blends. The in vitro toxicity of particulates significantly increased with ULSD blended with DMC and DEA, while it decreased when ULSD was blended with PME, DGM, and Bu.
Department of Civil and Environmental Engineering, Faculty of Engineering, National University of Singapore , 1 Engineering Drive 2, E1A 02-19, Singapore 117576, Singapore.
Zhi-Hui
ZH
Zhang
Rajasekhar
R
Balasubramanian
D020001:1-Butanol; D000272:Adipates; D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry / Q000633:toxicity; D000473:Alkanes / Q000032:analysis / Q000737:chemistry; D002244:Carbon / Q000032:analysis / Q000737:chemistry; D002470:Cell Survival / Q000187:drug effects; D004952:Esters; D005026:Ethylene Glycols; D005561:Formates; D005742:Gasoline; D008738:Methyl Ethers; D000073878:Palm Oil; D052638:Particulate Matter / Q000032:analysis / Q000737:chemistry / Q000633:toxicity; D010938:Plant Oils; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000737:chemistry; D001335:Vehicle Emissions / Q000032:analysis / Q000633:toxicity
D000272:Adipates; D000393:Air Pollutants; D000473:Alkanes; D004952:Esters; D005026:Ethylene Glycols; D005561:Formates; D005742:Gasoline; D008738:Methyl Ethers; D052638:Particulate Matter; D010938:Plant Oils; D011084:Polycyclic Aromatic Hydrocarbons; D001335:Vehicle Emissions; D000073878:Palm Oil; D002244:Carbon; D020001:1-Butanol; C023025:methyl carbonate; C007391:diglyme