New Mesoporous Molybdenum-Containing Catalysts for Fast Oxidation of Sulfur-Containing Substrates

• Published in: Kinetics and catalysis 2023-02, Vol.64 (1), p.17-24
• Main Authors: Gul, O. O., Polikarpova, P. D., Akopyan, A. V., Anisimov, A. V.
• Format: Article
• Language: English
• Subjects: Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Dibenzothiophene; Hydrogen peroxide; Infrared spectroscopy; Low temperature; Molybdenum; Organosulfur compounds; Oxidation; Physical Chemistry; Substrates; X ray spectra
• ISSN: 0023-1584; 1608-3210
• DOI: 10.1134/S0023158423010020

The applicability of molybdenum-containing catalysts based on SBA-15, which were synthesized in one stage by a co-condensation method, to the oxidation processes of various organosulfur compounds was demonstrated for the first time. The composition and structure of the obtained materials were confirmed using a set of modern physicochemical methods, such as low-temperature nitrogen adsorption/desorption, X-ray spectral fluorescence analysis, X-ray diffraction (XRD) analysis, TEM, and IR spectroscopy. The effects of the amount of the active phase and the process conditions on the oxidation of a model mixture of dibenzothiophenes were studied. It was shown that the resulting catalyst worked at least in four cycles without significant loss of activity. A sample containing 5 wt % molybdenum made it possible to achieve a dibenzothiophene conversion of 100% in 5 min under the following conditions: 0.5 wt % of a 5% Mo-SBA-15 catalyst, the molar ratio H 2 O 2 : S = 6 : 1, and T = 80°C.