Bimetallic Heterogeneous Catalysts for the Oxidation of Sulfur-Containing Compounds with Hydrogen Peroxide

• Published in: Kinetics and catalysis Vol. 64; no. 5; pp. 627 - 634
• Main Authors: Gul, O. O., Polikarpova, P. D., Akopyan, A. V., Anisimov, A. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-10-2023; Springer Nature B.V
• Subjects: Bimetals; Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Conversion; Dibenzothiophene; Hydrogen peroxide; Iron oxides; Low temperature; Mixtures; Molybdenum; Organosulfur compounds; Oxidation; Oxidizing agents; Photoelectrons; Physical Chemistry; Substrates; Sulfur compounds; X ray photoelectron spectroscopy; dibenzothiophene; transition metal oxides; SBA-15; hydrogen peroxide; oxidative desulfurization; bimetallic catalyst
• ISSN: 0023-1584; 1608-3210
• DOI: 10.1134/S0023158423050038

Bimetallic heterogeneous catalysts based on SBA-15 containing molybdenum and iron oxides were studied in the oxidation reactions of model mixtures of organosulfur compounds. The addition of iron (in the form of iron(III) oxide) in an amount of 0.05 wt % to the catalyst 5% Mo/SBA-15 was the most effective. The catalysts were characterized by a complex of physicochemical methods: low-temperature adsorption–desorption of nitrogen, X-ray diffraction analysis, transmission electron microscopy, and X-ray photoelectron spectroscopy. The influence of the main oxidation parameters (reaction time, temperature, composition and amount of catalyst, and amount of oxidizing agent) on the conversion of dibenzothiophene as a component of the model mixture was investigated. Optimal oxidation conditions were selected to achieve the total conversion of the substrate: the molar ratio H
2
O
2
: S = 2 : 1, 0.5 wt % FeMo/SBA-15 catalyst, 60 min, and 60°C. Catalysts can be used for at least five cycles without loss of activity during their intermediate washing from oxidation products.