Abstract
AbstractThe triphasic aerobic extractive desulfurization of benzothiophene (BT) using an aqueous H8[PV5Mo7O40] solution as catalyst and O2 as oxidant was investigated. A time‐resolved analysis of all reaction products in the gas, organic and aqueous phase, is given. The organic sulfur in BT is mainly converted to sulfuric acid. Mass transport limitations can be excluded. The reaction orders are 1 with regard to BT, and 0.5 both for HPA‐5 and O2. Calculated data derived from this mechanism with a power law kinetic approach show good agreement to the experimental data for conversions below 60 %. At higher BT conversions, significant deviations are found, suggesting that acidic products formed in the BT oxidation affect the catalyst and therefore the initial kinetics of the BT oxidation.
Highlights
Sulfur-free fuels can be produced from syngas (CO, H2) by Fischer-Tropsch synthesis [1]
We presented an efficient way of oxidizing benzothiophene (BT) with H8[PV5Mo7O40] (HPA-5) in an aerobic extractive oxidative desulfurization (AEODS), yielding mainly sulfuric acid and other water-soluble sulfur-containing organic acids [28]
HPA-5 was characterized by inductively coupled plasma optical emission spectroscopy (ICP-OES), UV-Vis, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetry (TG), and 31P-NMR spectroscopy
Summary
Sulfur-free fuels can be produced from syngas (CO, H2) by Fischer-Tropsch synthesis [1]. H2 can be generated from various renewable resources, for example from water electrolysis [2], e.g., with surplus energy from renewable sources, or with enzymes from sugar as feedstock [3]. CO can be obtained by the reverse water-gas shift reaction of CO2 and H2 [4]. The production of fuels using the power-to-liquid (PtL) concept is technically feasible in an environmentally more benign way [5]. Since production costs exceed those of conventional fuel production, PtL processes have not yet been established. Fuels from crude oil, supplied from the refinery industry, remain the main source for transportation and heating fuels
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