Octane Modeling of Isobutanol Blending into Gasoline

Teresa Alleman, Avantika Singh, Earl Christensen, Ethan Simmons, Glenn Johnston

Research output: Contribution to journalArticlepeer-review

8 Scopus Citations


Thirty-four gasoline blendstocks for oxygenate blending were used to create finished gasoline blends with isobutanol content of 12.5 volume percent (vol. %) and 16 vol. %. The gasoline blendstocks and finished fuels were analyzed for octane number (research [RON] and motor [MON]) to determine the effect of blending isobutanol. Volumetric and molar linear blending models were developed to predict finished fuel RON and MON, starting from the properties and composition of the gasoline blendstocks and isobutanol. Results show the molar blending model provided a better fit for the experimental data than the volumetric blending model. The volumetric model was further improved by adding nonlinear terms, improving the error to within ~1 ON. Gasoline blendstock properties impacted the finished fuel RON/MON, with paraffins having a synergistic effect with isobutanol and olefins and aromatics having an antagonistic effect.
Original languageAmerican English
Pages (from-to)8424-8431
Number of pages8
JournalEnergy and Fuels
Issue number7
StatePublished - 2020

NREL Publication Number

  • NREL/JA-5400-74574


  • BOB
  • gasoline blending model
  • isobutanol
  • MON
  • RON


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