Biofuels from Renewable Feedstocks Show Promise, but Pollution Concerns Remain

Strategic Insights -

Advanced biofuels produced from waste biomass and other renewable feedstocks have the potential to decarbonize transportation and reduce greenhouse gas emissions, according to a new study published in the International Journal of Engine Research. Researchers at University College London (UCL) investigated the effects of four biofuel molecules on combustion, engine-out exhaust emissions, and pollutant conversion in a gasoline direct-injection engine. While the results showed promise for some biofuels, others presented pollution concerns.

Key Takeaways:

  • The study found that advanced biofuels from renewable feedstocks, such as waste biomass, have the potential to decarbonize transportation and reduce greenhouse gas emissions.
  • However, the use of certain biofuel molecules increased carbon monoxide (CO) and nitrogen oxides (NOx) engine-out emissions, highlighting the need for further research on the environmental impacts of biofuel use.
  • Gamma valerolactone (GVL) was found to reduce NOx emissions, while hydrogen (H2) emissions correlated with the blend hydrogen carbon ratio.
  • The use of all biofuel blends increased the three-way catalyst (TWC) inlet temperature required for pollutant conversion, and some biofuels significantly increased hydrogen (H2) levels post-TWC at higher temperatures.
  • Linalool (LNL) exhibited higher particulate levels post-TWC than gasoline only, despite lower engine-out emissions during combustion of the biofuel blend.

Statistics:

  • The study investigated the effects of four biofuel molecules on combustion, engine-out exhaust emissions, and pollutant conversion in a gasoline direct-injection engine.
  • The biofuel blends were blended with reference gasoline at 20% wt/wt and supplied to the engine.
  • The study found that the biofuel blends displayed similar rates of heat release rate relative to gasoline combustion, except for the MF blend that significantly increased CO and NOx engine-out emissions.

Sources:

  • NewsRx. Findings from University College London (UCL) Provide New Insights into Biofuel (Effects of Bio-derived Oxygenated Fuel Molecules On Emission Reduction By a Three-way Catalyst During Combustion In a Direct-injection Spark Ignition Engine). Biotech Week. August 20, 2025; p 123.
  • International Journal of Engine Research. Effects of Bio-derived Oxygenated Fuel Molecules On Emission Reduction By a Three-way Catalyst During Combustion In a Direct-injection Spark Ignition Engine. 2025.
  • Sage Publications Ltd. International Journal of Engine Research can be contacted at: Sage Publications Ltd, 1 Olivers Yard, 55 City Road, London EC1Y 1SP, England. (Sage Publications - www.sagepub.com/; International Journal of Engine Research - jer.sagepub.com)