An Efficient Vanadia Supported SrTiO₃ Nanocatalyst for the Selective Oxidation of Benzylalcohol to Benzaldehyde

Abstract

In the present study, SrTiO 3 (STO) was synthesized using oxalate method. A series of V 2 O 5 nanoparticles supported on SrTiO 3 (V 2 O 5 / STO) with the vanadia content ranging from 0.5 to 2 wt. % was synthesized by wet impregnation method. Physicochemical properties of the synthesized catalysts were determined by X-ray diffraction, Fourier transform infrared spectroscopy, Transmission electron microscopy, N 2 physisorption and X-ray photoelectron spectroscopy and acidity by pyridine adsorption method. XPS studies of the catalysts reveal that vanadium is in + 5 oxidation state. Particle size of the catalysts calculated from TEM image analysis was found to be in the range of 86-92 nm. Pyridine adsorption studies reveals presence of Lewis acidity in the catalysts and the number of Lewis acid sites increase with vanadium content of the catalysts. Their catalytic activity was evaluated for the liquid phase oxidation of benzyl alcohol to benzaldehyde. STO is found to be least active and highly selective for the formation of benzaldehyde product where as V 2 O 5 /STO catalysts were found to be highly active and selective for the oxidation of benzyl alcohol reaction. Among all the catalysts the one with 1 wt. % loading of vanadia contains a greater number of active sites is found to be highly efficient heterogeneous catalyst system for selective oxidation of benzyl alcohol with 100 % benzaldehyde selectivity. The catalytic activity of the catalysts was correlated with the physico-chemical properties of the catalysts.

Solvothermal synthesis of VO2 nanoparticles with locally patched V2O5 surface layer and their morphology-dependent catalytic properties for the oxidation of alcohols

“…To confirm that enhanced catalytic activity is related to VO 2 nanomaterials with traces of V 2 O 5 surface patches (VO 2 /V 2 O 5 hybrid) and not just due to the surface V 2 O 5 layer, we provide a comparison based on previous reports. [81][82][83][84][85][86] (Table S1 †). The results in Table S1 † show that, depending on their morphology, VO 2 nanomaterials with patches of a V 2 O 5 surface layer exhibit better catalytic activity than pure V 2 O 5 nanoparticles as well as V 2 O 5 nanoparticles on different support surfaces.…”

Advances and future trends in selective oxidation catalysis: a critical review

“…Oxidation reactions were performed using acetonitrile as solvent, 30 mmol benzyl alcohol and 90 mmol TBHP with 100 mg of 1 wt% vanadia on SrTiO 3 catalyst, resulting in the highest conversion with 100% benzaldehyde selectivity at 80 °C. 21…”

“…Oxidation reactions were performed using acetonitrile as solvent, 30 mmol benzyl alcohol and 90 mmol TBHP with 100 mg of 1 wt% vanadia on SrTiO 3 catalyst, resulting in the highest conversion with 100% benzaldehyde selectivity at 80 °C. 21 Secondary additives such as magnesium oxide, silica, boron nitride, sepiolite and zinc oxide with graphite as the primary shaping agent were used to prepare modified vanadiumaluminum mixed oxides catalysts to investigate catalytic properties. Boron nitride and sepiolite showed the best catalytic activity with high conversion to propene.…”

Highly Active and Recyclable CuxFe3‐xO4 NPs for Selective Oxidation of Benzyl Alcohol using TBHP as an Oxidant

“…[3] The selective BzOH oxidation using diverse oxidants has been carried out over various heterogeneous catalysts consisting of metal oxides and inorganic complexes. [4][5][6][7][8][9][10] Catalysts containing transition metal active regions have been extensively explored in recent years for the selective oxidation of benzyl alcohol like Co, [11] Cu, [12] Mn, [13] Ag, [14] Pd, [15] etc. This typical catalytic reaction technique necessitates the use of solvents, like acetonitrile, [16] water, [17] methanol [18] and cyclohexane, [19] etc.…”

“…Therefore, the selective oxidation of benzyl alcohol (BzOH) is considered as another efficient alternate route for the production of BzCHO as it is eco‐benign and carbon‐neutral [3] . The selective BzOH oxidation using diverse oxidants has been carried out over various heterogeneous catalysts consisting of metal oxides and inorganic complexes [4–10] . Catalysts containing transition metal active regions have been extensively explored in recent years for the selective oxidation of benzyl alcohol like Co, [11] Cu, [12] Mn, [13] Ag, [14] Pd, [15] etc.…”