Dichlorodioxomolybdenum(VI) complexes bearing oxygen-donor ligands as catalysts for oxidative desulfurization of simulated and real diesel


The complexes [MoO2Cl2(DMB)(2)] (1) and [MoO2Cl2(DEO)] (2) (DMB = N,N-dimethylbenzamide, DEO = N,N'-diethyloxamide) have been evaluated as catalysts in extractive-catalytic oxidative desulfurization (ECOD) of a simulated diesel fuel. Using the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6) as extraction solvent and H2O2 as oxidant, ultra-deep desulfurization (S-content from 3000 ppm to < 10 ppm) was possible within a reaction time of 1-3 h, and the systems Catalyst/[BMIM]PF6 could be recycled for five times without significant decrease in activity. The S-content of a real untreated diesel was lowered by 94.4% from 2300 ppm to 129 ppm after only 2 h of reaction using the ECOD process with 2 as catalyst.



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Juliao, D; Gomes, AC; Cunha-Silva, L; Pillinger, M; Lopes, AD; Valenca, R; Ribeiro, JC; Goncalves, IS; Balula, SS

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This work was partly funded through the projects REQUIMTE-LAQV [FCT (Fundacao para a Ciencia e a Tecnologia) Ref. UID/QUI/50006/2019], CICECO - Aveiro Institute of Materials (FCT Ref. UID/CTM/50011/2019), and the Centre of Marine Sciences - CCMAR (UID/Multi/04326/2019), financed by national funds through the FCT/MCTES. The FCT and the European Union are acknowledged for a personal grant to D.J. (SFRH/BD/102783/2014), co -funded by MCTES and the European Social Fund through the program POPH of QREN. The position held by A.C.G. was funded by national funds (OE), through FCT, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of article 23 of the Decree-Law 57/2016 of 29 August, changed by Law 57/2017 of 19 July.

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