Advanced Methods for the Formation of Crust Catalysts
for Oxidative Desulfurization1
A. A. Bryzhina, T. N. Rostovshchikovaa, K. I. Maslakova, I. V. Lukiyanchukb, M. S. Vasilyevab, c,
A. Yu. Ustinovb, S. A. Gurevichd, D. A. Yavsind, and I. G. Tarkhanovaa, *
a Department of Chemistry, Moscow State University, Moscow, 119991 Russia
b Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, 690022 Russia
c Far Eastern Federal University, Russkii Island, Vladivostok, 690922 Russia
d Ioffe Institute St. Petersburg, 194021 Russia
Correspondence to: *e-mail: itar_msu@mail.ru
1Abbreviations and notation: LED, laser electrodispersion; PEO, plasma electrolytic oxidation; T, thiophene; DBT, dibenzothiophene; MPS, methylphenyl sulfide; XPS, X-ray photoelectron spectroscopy; XPA, X-ray phase analysis; SEM, scanning electron microscopy; EDXS, energy dispersive X-ray spectroscopy; EDA – energy dispersive analysis.
Received 15 June, 2021
Abstract—The catalytic properties of W- and NiW-layered structures obtained by laser electrodispersion (LED) and plasma electrolytic oxidation (PEO) are investigated in oxidative desulfurization reactions. A comparative analysis of the effect of the composition, the concentration of the active phase, and the structure of the composites on the model reactions of oxidation of thiophene (T), dibenzothiophene (DBT), and methylphenyl sulfide (MPS) with hydrogen peroxide, and on the removal of sulfur from the diesel fraction of a petroleum feedstock is performed. In both cases, the introduction of nickel into W-containing composites increases their activity and resistance to leaching and etching by reaction products. It is found that the activity series with respect to organosulfur substrates are different for the NiW-LED (dibenzothiophene > thiophene > thioanisole) and NiW-PEO catalysts (thioanisole> dibenzothiophene> thiophene). The NiW-PEO catalyst makes it possible to remove 98% of sulfur from the diesel fraction.
Keywords: oxidative desulfurization, hydrogen peroxide, heterogeneous catalysts, plasma electrolytic oxidation, laser electrodispersion
DOI: 10.1134/S0023158421060033