Comparison of the effect of biodiesel-diesel and ethanol-diesel on the gaseous emission of a direct-injection diesel engine

Yage Di, Chun Shun Cheung, Zuohua Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

80 Citations (Scopus)


Experiments were conducted on a 4-cylinder direct-injection diesel engine using ultralow sulfur diesel blended with biodiesel and ethanol to investigate the gaseous emissions of the engine under five engine loads at the maximum torque engine speed of 1800 rev min-1. Four biodiesel blended fuels and four ethanol blended fuels with oxygen concentrations of 2%, 4%, 6% and 8% were used. With the increase of oxygen content in the blended fuels, the brake thermal efficiency improves slightly. For the diesel-biodiesel fuels, the brake specific HC and CO emissions decrease while the brake specific NOxand NO2emissions increase. The emissions of formaldehyde, 1,3-butadiene, toluene, xylene and overall BTX (benzene, toluene, xylene) in general decrease, however, acetaldehyde and benzene emissions increase. For the diesel-ethanol fuels, the brake specific HC and CO emissions increase significantly at low engine load, NOxemission decreases at low engine load but increases at high engine load. The emissions of benzene and BTX vary with engine load and ethanol content. Similar to the biodiesel-diesel fuels, the formaldehyde, 1,3-butadiene, toluene and xylene emissions decrease while the acetaldehyde and NO2emissions increase. Despite having the same oxygen contents in the blended fuels, there are significant differences in the gaseous emissions between the biodiesel-diesel blends and the ethanol-diesel blends.
Original languageEnglish
Pages (from-to)2721-2730
Number of pages10
JournalAtmospheric Environment
Issue number17
Publication statusPublished - 1 Jun 2009


  • Biodiesel
  • Ethanol
  • Regulated gaseous emissions
  • Ultralow sulfur diesel
  • Unregulated gaseous emissions

ASJC Scopus subject areas

  • Environmental Science(all)
  • Atmospheric Science

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