New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method
journal contributionposted on 01.04.2022, 21:09 by Argam V. Akopyan, Raman A. Mnatsakanyan, Ekaterina A. Eseva, David A. Davtyan, Polina D. Polikarpova, Maxim O. Lukashov, Ivan S. Levin, Kirill A. Cherednichenko, Alexander V. Anisimov, Anna M. Terzyan, Artur M. Agoyan, Eduard A. Karakhanov
Herein, we present a new type of high-performance catalyst for aerobic oxidation of organosulfur compounds based on tungsten carbide. The synthesis of tungsten carbide was performed via microwave irradiation of the precursors, which makes it possible to obtain a catalyst in just 15 min. The synthesized catalyst was investigated by a variety of physicochemical methods: X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, electron microscopy, and N2 adsorption/desorption. It was shown that active centers containing tungsten in the transition oxidation state (+4) play a key role in the activation of oxygen. The main factors influencing the conversion of dibenzothiophene (DBT) were investigated. It should be noted that 100% conversion of DBT can be achieved under relatively mild conditions: 120 °C, 3 h, 6 bar, and 0.5% wt catalyst. The catalyst retained its activity for at least six oxidation/regeneration cycles. The simplicity and speed of synthesis of the proposed catalyst in combination with its high activity and stability open broad prospects for its further use both for oxidative desulfurization and for other reactions of aerobic oxidation of organic substrates.
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relatively mild conditionsorganosulfur compounds basedmicrowave method hereinmain factors influencing120 ° cleast six oxidationray photoelectron spectroscopy2 </ subtungsten carbide synthesizedtungsten carbideray diffractionraman spectroscopyaerobic oxidationsynthesized catalystregeneration cyclesphysicochemical methodsoxidative desulfurizationorganic substratesnew typekey roleelectron microscopy6 bar3 h15 min