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Bertleff, Benjamin ; Claußnitzer, Johannes ; Korth, Wolfgang ; Wasserscheid, Peter ; Jess, Andreas ; Albert, Jakob:
Catalyst Activation and Influence of the Oil Matrix on Extractive Oxidative Desulfurization Using Aqueous Polyoxometalate Solutions and Molecular Oxygen.
In: Energy & Fuels.
Bd. 32
(2018)
Heft 8
.
- S. 8683-8688.
ISSN 1520-5029
DOI: https://doi.org/10.1021/acs.energyfuels.8b01514
Abstract
Our contribution describes the oxidative desulfurization of dibenzothiophene (DBT) from model oils using an
aqueous H8PV5Mo7O40 (HPA-5) catalyst solution and molecular oxygen as the oxidant. In contrast to common oxidative
desulfurization (ODS) protocols, the organic sulfur compound DBT is oxidized to water-soluble compounds, such as sulfuric
acid (50−55%), sulfoacetic acid (20−25%), and sulfobenzoic acid (25−30%), which are extracted in situ into the aqueous
catalyst phase. We describe the activating effect of oxalic acid on the ODS performance of the catalyst and propose a mechanism
for the catalyst activation. Moreover, we report on the influence of various organic solvents, i.e., n-alkanes and aromatics, on the
oxidative DBT removal. Remarkably, the rate of DBT oxidation and removal enhances with an increasing chain length of the
alkane matrix, whereas aromatic compounds in the oil matrix inhibit the desulfurization rate. Moreover, we demonstrate that the aqueous catalyst phase can be reused at least 5 times without loss in catalytic performance.