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Extraction-Coupled Oxidative Desulfurization (ECODS) of n-Tetradecane as Model Oil under Moderate Conditions Using Molecular Oxygen

Title data

Tochtermann, Jens ; Huber, Michael ; Korth, Wolfgang ; Albert, Jakob ; Jess, Andreas:
Extraction-Coupled Oxidative Desulfurization (ECODS) of n-Tetradecane as Model Oil under Moderate Conditions Using Molecular Oxygen.
In: Energy & Fuels. Vol. 37 (2023) Issue 13 . - pp. 9452-9462.
ISSN 1520-5029
DOI: https://doi.org/10.1021/acs.energyfuels.3c00971

Official URL: Volltext

Abstract in another language

The capability of extraction-coupled oxidative desulfurization (ECODS) to remove refractory sulfur compounds like dibenzothiophene from a model fuel has been investigated. Therefore, n-tetradecane was chosen as a diesel fuel matrix, and an aqueous H8[PV5Mo7O40] (HPA-5) polyoxometalate catalyst solution was used for the oxidative treatment. The oxidant of choice was molecular oxygen, and the desulfurization was conducted under moderate reaction conditions (130 °C, 20 bar O2). Thiophene and benzothiophene were found to degrade so fast into water-soluble substances that neither sulfoxides nor sulfones could be detected analytically as reaction intermediates. However, the analytical data show that the oxidation of refractory sulfur molecules, like dibenzothiophene (DBT) and its alkylated derivatives, into water-soluble products occurs via the sulfoxides and sulfones in a subsequent reaction. Furthermore, the kinetic data reveal that the degradation of the sulfone, i.e., the carbon skeleton, represents the rate-determining step in ECODS of dibenzothiophenes. The sulfoxide being formed initially is almost directly converted to the corresponding sulfone that accumulates and is only slowly transferred to water-soluble products. In contrast to thiophene and benzothiophene, DBT was found to inhibit the formation of active catalyst species. This inhibition could be reversed by adding a sacrificial substrate such as oxalic acid yielding the active catalyst species by reduction of HPA-5 from VV to VIV. Finally, the influence of organic nitrogen and oxygen compounds, which are also present in real distillation cuts, on ECODS has been studied.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 23 Oct 2023 11:38
Last Modified: 23 Oct 2023 11:38
URI: https://eref.uni-bayreuth.de/id/eprint/87325