Regulated and unregulated emissions from a diesel engine fueled with diesel fuel blended with diethyl adipate

Ruijun Zhu, Chun Shun Cheung, Zuohua Huang, Xibin Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

39 Citations (Scopus)


Experiments were carried out on a four-cylinder direct-injection diesel engine operating on Euro V diesel fuel blended with diethyl adipate (DEA). The blended fuels contain 8.1%, 16.4%, 25% and 33.8% by volume fraction of DEA, corresponding to 3%, 6%, 9% and 12% by mass of oxygen in the blends. The engine performance and exhaust gas emissions of the different fuels were investigated at five engine loads at a steady speed of 1800 rev/min. The results indicated an increase of brake specific fuel consumption and brake thermal efficiency when the engine was fueled with the blended fuels. In comparison with diesel fuel, the blended fuels resulted in an increase in hydrocarbon (HC) and carbon monoxide (CO), but a decrease in particulate mass concentrations. The nitrogen oxides (NOx) emission experienced a slight variation among the test fuels. In regard to the unregulated gaseous emissions, formaldehyde and acetaldehyde increased, while 1,3-butadiene, ethene, ethyne, propylene and BTX (benzene, toluene and xylene) in general decreased. A diesel oxidation catalyst (DOC) was found to reduce significantly most of the investigated unregulated pollutants when the exhaust gas temperature was sufficiently high.
Original languageEnglish
Pages (from-to)2174-2181
Number of pages8
JournalAtmospheric Environment
Issue number13
Publication statusPublished - 1 Apr 2011


  • Diesel engine
  • Diethyl adipate (DEA)
  • Euro V diesel fuel
  • Regulated emissions
  • Unregulated emissions

ASJC Scopus subject areas

  • General Environmental Science
  • Atmospheric Science


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