Atmospheric environment

Combination of biodiesel-ethanol-diesel fuel blend and SCR catalyst assemblyto reduce emissions from a heavy-duty diesel engine

SHI Xiaoyan , YU Yunbo , HE Hong , SHUAI Shijin , DONG Hongyi , LI Rulong


Received April 23, 2007,Revised September 10, 2007, Accepted , Available online

Volume 20,2008,Pages 177-182

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In this study, the e orts to reduce NOx and particulate matter (PM) emissions from a diesel engine using both ethanol-selective catalytic reduction (SCR) of NOx over an Ag/Al2O3 catalyst and a biodiesel-ethanol-diesel fuel blend (BE-diesel) on an engine bench test are discussed. Compared with diesel fuel, use of BE-diesel increased PM emissions by 14% due to the increase in the soluble organic fraction (SOF) of PM, but it greatly reduced the Bosch smoke number by 60%–80% according to the results from 13-mode test of European Stationary Cycle (ESC) test. The SCR catalyst was e ective in NOx reduction by ethanol, and the NOx conversion was approximately 73%. Total hydrocarbons (THC) and CO emissions increased significantly during the SCR of NOx process. Two diesel oxidation catalyst (DOC) assemblies were used after Ag/Al2O3 converter to remove CO and HC. Di erent oxidation catalyst showed opposite e ect on PM emission. The PM composition analysis revealed that the net e ect of oxidation catalyst on total PM was an integrative e ect on SOF reduction and sulfate formation of PM. The engine bench test results indicated that the combination of BE-diesel and a SCR catalyst assembly could provide benefits for NOx and PM emissions control even without using diesel particle filters (DPFs).

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