Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12191
Title: Experimental investigation on regulated and unregulated emissions of a diesel/methanol compound combustion engine with and without diesel oxidation catalyst
Authors: Zhang, ZH
Cheung, CS 
Chan, TL 
Yao, CD
Keywords: Diesel engine
Methanol
Particulate emission
Unregulated emissions
Issue Date: 2010
Publisher: Elsevier
Source: Science of the total environment, 2010, v. 408, no. 4, p. 865-872 How to cite?
Journal: Science of the total environment 
Abstract: The use of methanol in combination with diesel fuel is an effective measure to reduce particulate matter (PM) and nitrogen oxides (NOx) emissions from in-use diesel vehicles. In this study, a diesel/methanol compound combustion (DMCC) scheme was proposed and a 4-cylinder naturally-aspirated direct-injection diesel engine modified to operate on the proposed combustion scheme. The effect of DMCC and diesel oxidation catalyst (DOC) on the regulated emissions of total hydrocarbons (THC), carbon monoxide (CO), NOx and PM was investigated based on the Japanese 13 Mode test cycle. Certain unregulated emissions, including methane, ethyne, ethene, 1,3-butadiene, BTX (benzene, toluene, xylene), unburned methanol and formaldehyde were also evaluated based on the same test cycle. In addition, the soluble organic fraction (SOF) in the particulate and the particulate number concentration and size distribution were investigated at certain selected modes of operation. The results show that the DMCC scheme can effectively reduce NOx, particulate mass and number concentrations, ethyne, ethene and 1,3-butadiene emissions but significantly increase the emissions of THC, CO, NO2, BTX, unburned methanol, formaldehyde, and the proportion of SOF in the particles. After the DOC, the emission of THC, CO, NO2, as well as the unregulated gaseous emissions, can be significantly reduced when the exhaust gas temperature is sufficiently high while the particulate mass concentration is further reduced due to oxidation of the SOF.
URI: http://hdl.handle.net/10397/12191
ISSN: 0048-9697
EISSN: 1879-1026
DOI: 10.1016/j.scitotenv.2009.10.060
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