Titanium dioxide doped with vanadium as effective catalyst for selective oxidation of diphenyl sulfide to diphenyl sulfonate

被引:0
作者
Marcelina Radko
Andrzej Kowalczyk
Ewa Bidzińska
Stefan Witkowski
Sylwia Górecka
Dominik Wierzbicki
Katarzyna Pamin
Lucjan Chmielarz
机构
[1] Jagiellonian University,Faculty of Chemistry
[2] AGH University of Science and Technology,Faculty of Energy and Fuels
[3] Polish Academy of Sciences,Jerzy Haber Institute of Catalysis and Surface Chemistry
来源
Journal of Thermal Analysis and Calorimetry | 2018年 / 132卷
关键词
Titanium dioxide; V-doped materials; Oxidation of Ph; S; Diphenyl sulfoxides and sulfones; Hydrogen peroxide;
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学科分类号
摘要
Diphenyl sulfide was oxidized to sulfoxide and sulfone over V-doped TiO2 using a 30% solution of H2O2. The TiO2 samples with different intended content of vanadium (0.02, 0.05, 0.1 and 0.18 mass%) were prepared by incipient wetness impregnation. Physicochemical properties of the V-doped TiO2 were characterized by chemical analysis (ICP-OES), X-ray diffraction (XRD/in situ HT-XRD), UV–Vis diffuse reflectance spectrometry (UV–Vis DRS), N2-sorption measurements, electron paramagnetic resonance and cyclic voltammetry. Both vanadium oxide loading and calcination temperature influenced the structure of the V-TiO2 samples. Vanadium species deposited on TiO2 decreased temperatures required for anatase to rutile phase transformation. The V-TiO2 samples were found to be efficient catalysts for oxidation of sulfides to sulfones. The sample with the lowest vanadium content (0.02VTiO2) presented among the studied catalysts the best catalytic properties with respect to high conversion of diphenyl sulfide to diphenyl sulfonate. An increase in vanadium loading resulted in decrease in catalytic activity of the samples. Also non-modified TiO2 presented significantly lower catalytic activity in comparison with 0.02VTiO2. This interesting effect was related to the formation of highly dispersed vanadium species catalytically active in Ph2S oxidation in the case of the samples with lower V-content. An increase in vanadium loading results in the formation of more aggregated V-species inactive, or less active, in the process of diphenyl sulfide oxidation.
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页码:1471 / 1480
页数:9
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