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Extractive Denitrogenation of Fuel Oils with Ionic Liquids: A Systematic Study

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Laboratory of Advanced Catalysis for Sustainability, School of Chemistry F11, The University of Sydney, Sydney, New South Wales 2006, Australia
Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, 30170 Venezia Mestre, Italy
*Telephone: +61-2-93512581. E-mail: [email protected]
Cite this: Energy Fuels 2017, 31, 3, 2183–2189
Publication Date (Web):November 21, 2016
Copyright © 2016 American Chemical Society

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    Ionic liquids (ILs) have been suggested as useful extractants of aromatic nitrogen-containing compounds (N compounds) from fuel oils. In this systematic study, ILs based on common cations and anions are employed as extractants of the archetypical N compounds pyridine and indole from a model oil consisting of decane and toluene. The performance of these ILs as extractants of N compounds is compared and rationalized. It is demonstrated that the cation and anion sizes (offering more surface area for extractants to interact) are the major factors determining the effectiveness of N compound extraction, although hydrogen bond donor/acceptor abilities of ILs can also play a role in the removal of these N compounds. In this study, some ILs are found to dissolve a considerable amount of oil contents. This undesired property can be controlled by the size of IL ions.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.energyfuels.6b02157.

    • Decrease in the pyridine concentration of the oil phase versus time (temperature, 25 °C; and 3.43 mmol of ILs/2 mL of model oil) (Table S1), decrease in the indole concentration of the oil phase versus time (temperature, 25 °C; and 3.43 mmol of ILs/2 mL of model oil) (Table S2), and N extraction efficiencies of pyridine and indole with respect to 0.1 g of different ILs (temperature, 25 °C; 3.43 mmol of ILs/2 mL of model oil; and extraction time, 20 min) (Table S3) (PDF)

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