Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 257, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.117938
Keywords
Catalytic oxidative desulfurization; Hydrogen peroxide; Phosphomolybdic and phosphotungstic heteropolyacids; Supported ionic liquid phase
Funding
- Moscow State University Development Program
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In this manuscript novel heterogeneous catalysts for fuel desulfurization via peroxide oxidation are reported. The obtained catalysts combine high catalytic activity and stability with perfect synthetic availability, their composition and structure were ascertained. The catalysts represent supported ionic liquid phases (SILPs): Bronsted acidic ILs, namely 4-(3'- ethylimidazolium)-butanesulfonate, with two heteropolyacids (HPA) (sulfated ionic liquid protonated by H3PMo12O40 or H3PW12O40). Silica and gamma-Al2O3 were used as support materials. These compositions ensure higher stability of heteropolyanions and make the catalyst stable over several successive oxidation cycles. The most active catalyst based on phosphomolybdic acid provides a high conversion rate for thiophene, thioanisole, and dibenzothiophene (turn over frequency of about 150-1200 h(-1) per mole of HPA). Another important benefit of the reported systems is the desulfurization of diesel fuel with a very high efficiency (residual amount of sulfur < 10 ppm) under mild conditions.
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