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

Abstract

Diphenyl sulfide was oxidized to sulfoxide and sulfone over V-doped TiO 2 using a 30% solution of H 2 O 2 . The TiO 2 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 TiO 2 were characterized by chemical analysis (ICP-OES), X-ray diffraction (XRD/in situ HT-XRD), UV-Vis diffuse reflectance spectrometry (UV-Vis DRS), N 2 -sorption measurements, electron paramagnetic resonance and cyclic voltammetry. Both vanadium oxide loading and calcination temperature influenced the structure of the V-TiO 2 samples. Vanadium species deposited on TiO 2 decreased temperatures required for anatase to rutile phase transformation. The V-TiO 2 samples were found to be efficient catalysts for oxidation of sulfides to sulfones. The sample with the lowest vanadium content (0.02VTiO 2 ) 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 TiO 2 presented significantly lower catalytic activity in comparison with 0.02VTiO 2 . This interesting effect was related to the formation of highly dispersed vanadium species catalytically active in Ph 2 S 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.

Catalytic and photocatalytic oxidation of diphenyl sulphide to diphenyl sulfoxide over titanium dioxide doped with vanadium, zinc, and tin

“…A similar effect was reported and discussed in our previous paper for TiO 2 doped with vanadium. 22 The phase composition of the samples was analysed using Xray diffraction and Raman spectroscopy. The results of these analyses are presented in Fig.…”

“…A similar effect of the anatase to rutile transformation in the presence of small amounts of vanadium was recently reported by Shao et al, 25 as well as in our previous paper. 22 This phenomenon could be explained by the possible incorporation of V 4+ cations into the vacant Ti 4+ positions in anatase. 26,27 Such a substitution is possible due to the similar ionic radii of Ti 4+ (0.061 nm) and V 4+ (0.058 nm).…”

Selective and efficient catalytic and photocatalytic oxidation of diphenyl sulphide to sulfoxide and sulfone: the role of hydrogen peroxide and TiO2 polymorph

“…Additionally, TiO 2 doped with vanadium was found to be an active catalyst of Ph 2 S oxidation giving nearly 100% conversion of Ph 2 S with high selectivity to Ph 2 SO 2 . 15 SiO 2 –TiO 2 mesoporous xerogel catalyses oxidation to the final product, diphenyl sulfone, with the selectivity of 85%. 16 Furthermore, it was confirmed that titanosilicate zeolites ( inter alia , Ti-beta, 17 Ti-MWW, 18 Ti-FER, MTS-1 (ref.…”

Porous MoO3@SiC hallow nanosphere composite as an efficient oxidative desulfurization catalyst

“…Now, the ODS method is an interesting topic for researchers to introduce an economic and efficient method for desulfurization of fuels . Various catalysts are previously used in the ODS reaction such as W, Mo, V, Ti, and Fe Oxides . Among them, the catalysts based on molybdenum oxide has shown good results in ODS reaction .…”

“…[7][8][9][10][11][12][13] Various catalysts are previously used in the ODS reaction such as W, Mo, V, Ti, and Fe Oxides. [14][15][16] Among them, the catalysts based on molybdenum oxide has shown good results in ODS reaction. [17][18][19][20] Furthermore, alumina, activated carbon, and silica are commonly used as the ODS catalyst supports.…”