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Mirante, Fátima; Alves, Ana C.; Julião, Diana; Almeida, Pedro L.; Gago, Sandra; Valença, Rita; Ribeiro, Jorge C.; de Castro, Baltazar; Granadeiro, Carlos M.; Balula, Salete S.
Fuel (Guildford), 01/2020, Volume: 259Journal Article
A novel composite has been prepared through the immobilization of the Keggin sandwich-type Sm(PMo11O39)211− anion (SmPOM) on large-pore silica spheres previously functionalized with trimethylammonium groups (TMA). The resulting SmPOM@TMA-LPMS material has been evaluated as heterogeneous catalyst in a biphasic desulfurization 1:1 diesel/extraction solvent system using H2O2 as oxidant. Preliminary experiments were conducted with different extraction solvents, acetonitrile and BMIMPF6 ionic liquid. The optimized extractive and catalytic oxidative desulfurization system (ECODS) with BMIMPF6 was able to reach complete sulfur removal from a model diesel containing 2100 ppm S in just 60 min (10 min of initial extraction + 50 min of catalytic step). The reutilization of catalyst and extraction phase has been successfully performed without loss of desulfurization efficiency in consecutive cycles, turning the process more sustainable and cost-effective. The remarkable results with simulated diesel have motivated the application of the catalyst in the desulfurization of untreated real diesel and 74% of efficiency was achieved after only 2 h for three consecutive cycles.
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