(OTA)3FeMo6-DES: a liquid catalyst integrating catalytic and extractive functions for room-temperature oxidative desulfurization

Abstract

To address the intrinsic limitations of up-to-date oxidative desulfurization, this study adopted a synergistic polyoxometalate (POM) - deep eutectic solvent (DES) catalytic strategy to prepare a liquid catalyst (POM-DES) with dual functions of catalysis and extraction through simple stirring. Experimental results demonstrate that the catalyst-composed of an Anderson-type polyoxometalate (OTA)3FeMo6 and a p-toluene sulfonic acid-based ternary DES-achieves complete removal of DBT under mild conditions (30 °C, O/S = 2.8, DES dosage = 0.5 mL, POM loading = 0.02 g mL-1) within 30 minutes. Moreover, the catalyst exhibits excellent recyclability, maintaining high activity over five consecutive cycles without significant deactivation. This work not only presents an efficient and cost-effective strategy for deep desulfurization under mild conditions but also offers new insights into the design and optimization of multicomponent cooperative catalytic systems.

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