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Dissertaition journals: Catalytic Conversion of Ethanol into an Advanced Biofuel: Unprecedented Selectivity for n-Butanol†

Comparative exergy analysis of direct alcohol fuel cells using fuel mixtures
Performance and fuel conversion efficiency of a spark ignition engine fueled with iso-butanol
Performance of direct alcohol fuel cells fed with mixed methanol/ethanol solutions
Bio-ethanol – the fuel of tomorrow from the residues of today

Web of science: The effect of different alcohol fuels on the performance, emission and combustion characteristics of a gasoline engine

Combustion efficiency and engine out emissions of a S.I. engine fueled with alcohol/gasoline blends

web of science Effective utilisation of butanol along with gasoline in a spark ignitionengine through a dual injection system
Ethanol as the acyl acceptor for biodiesel production

Best one!!> Advances in diesel–alcohol blends and their effects on the performance and emissions of diesel engines

The potential of biomass fuels in the context of global climate change: Focus on transportation fuels
Performance tests of a diesel engine fueled with pentanol/diesel fuel blends
Physiological tolerance and stoichiometric potential of cyanobacteria for hydrocarbon fuel production
A comparison of performance of higher alcohols/diesel fuel blends in a diesel engine

Integrating syngas fermentation with the carboxylate platform and yeast fermentation to reduce medium cost and improve biofuel productivity
The path to next generation biofuels: successes and challenges in the era of synthetic biology

To sum up- butanol probably the most energy and less impacting on environment due to chemical structure- more carbon atoms and bigger hydrocarbon chains but ethanol is the cheapest to produce and can be made from lots of different things making it easier to produce. Also easiest to use as a fuel as it most closely resembles petrol so cars don’t have to be specially designed for it.
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