This work was supported by the Northern Research Partnership (NRP) in Scotland and the Scottish Sensor Systems Centre (SSSC) funded by the Scottish Funding Council (SFC).Peer reviewedPostprin

Corsetti, Stella

Kiefer, Johannes

McGloin, David

Zehentbauer, Florian M.

Fuel

English

Fuels for automotive propulsion are frequently blends of conventional gasoline and ethanol. However, the effects of adding an alcohol to a petrochemical fuel are yet to be fully understood. We report Fouriertransform infrared spectroscopy (FTIR) of ethanol/gasoline mixtures with systematically varied composition. Frequency shifts and excess infrared absorbance are analyzed in order to investigate the mixture behavior at the molecular level. The spectroscopic data suggest that the hydrogen bonding between ethanol molecules is weakened upon gasoline addition, but the hydrogen bonds do not disappear. This canbe explained by a formation of small ethanol clusters that interact via Van der Waals forces with the surrounding gasoline molecules. Furthermore, approaches for measuring the chemical composition of ethanol/gasoline blends by FTIR are discussed. For a simplistic approach based on the Beer–Lambert relation, an optimized set of parameters for quantitative measurements are determined. The best compromisebetween measurement sensitivity and accuracy is found for the CO stretching mode of the alcohol. For the traditional method of calibrating the ratio of integrated band intensities of the CH and OH stretchingregions it is found that narrowing the spectral window of the CH stretch can significantly improve the measurement sensitivity

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Characterization of gasoline/ethanol blends by infrared and excess infrared spectroscopy

Stella Corsetti

Florian M. Zehentbauer

David McGloin

Johannes Kiefer

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This work was supported by the Northern Research Partnership (NRP) in Scotland and the Scottish Sensor Systems Centre (SSSC) funded by the Scottish Funding Council (SFC).Peer reviewe

Aberdeen University Research

https://aura.abdn.ac.uk/bitstream/2164/4276/1/MS_revised.pdf

Characterization of gasoline/ethanol blends by infrared and excess infrared spectroscopy

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Aberdeen University Research

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