Abstract

Plasma technology is promising in partial oxidation of liquid fuel to oxygenates for cleaner combustion, but its efficiency requires improvement. Here, we demonstrate that the partial oxidation of n-C5H12 (a simulated gasoline fuel) by a dielectric barrier discharge (DBD) combined with Fe/Al2O3 catalysts could efficiently improve the oxygenates selectivity up to 53.1% with good stability at room temperature and atmospheric pressure. In comparison, the oxygenates selectivity for plasma only condition was 24.8%. However, a high background temperature and specific energy input had negative effect on the oxygenates selectivity. Plasma-added in situ diffuse reflectance infrared Fourier transform spectroscopy revealed that the n-C5H12 conversion was due to the electron-impact disassociation in the gas phase, and following plasma produced O-containing (O and OH) and CxHy active species could be adsorbed and then react with each other on the catalyst, improving the oxygenates production. Our results can guide the design of plasma-catalysis approach for fossil liquid fuel to oxygenates.

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