ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Oxidation of dibenzothiophene using magnetic coated catalyst in oscillating reactor: production of eco-friendly fuel and kinetic model

Jasim I. Humadi and Wadood T. Mohammed

Department of Petroleum and Gas Refining Engineering, College of Petroleum Processes Engineering, Tikrit University, Tikrit, Iraq

E-mail: jasim_alhashimi_ppe@tu.edu.iq

Received: 27 May 2025  Accepted: 2 December 2025

Abstract:

Catalytic oxidation of undesirable organic sulfur compounds in petroleum fuel is promising technique to produce clean fuel under mild conditions and cost effective process. This work is focused on removal of dibenzothiophene (DBT) from diesel fuel by catalytic oxidative process using synthetic manganese coated—activated carbon catalyst (alumina coated film- magnetic MnO₂/AC catalyst). The oxidation process is achieved using hydrogen peroxide as oxidant in new oscillation reactor by developing novel central baffle design under various conditions (1 atm, temperatures (30–90) °C, space times (3–12 min), oscillating frequencies (0.5 2) Hz, and oscillating amplitudes (3–12) mm). Dibenzothiophene removal is enhanced by increasing all the specified operational parameters. The new design of catalytic oxidative desulfurization process is satisfied dramatic removal (96%) at the best conditions (90 °C, 12 min, 2 Hz, and 12 mm). Loading of manganese and magnetic iron as dual active oxides over activated carbon are satisfied dramatic improve in DBT oxidation rate due to create more catalytic active sites, enhance sulfur adsorption capacity, modify the porous structure and surface chemistry, and generate more functional groups that boost the catalytic reactivity towards sulfur removal. The oxidation kinetic parameters are determined under the optimal conditions using magnetic coated catalyst in the oscillating reactor. Dibenzothiophene oxidative reaction is followed first order model, with remarkable low apparent activation energy (4.184 kJ/mol), which is referred to fast and efficient oxidation reaction in the oscillating reactor under minimum energy requirements.

Keywords: Oxidative desulfurization; Dibenzothiophene; Alumina-coated film; Magnetic MnO2-AC; Oscillating reactor; Kinetic model

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-025-04575-7

Chemical Papers 80 (3) 3121–3136 (2026)