Influence of alkaline earth metal on acid–base characteristics of V2O5/MO–TiO2 (M=Ca, Sr and Ba) catalysts

Reddy, Benjaram M.; Ratnam, K. Jeeva; Saikia, Pranjal; Thrimurthulu, Gode

doi:10.1016/j.molcata.2007.07.018

Cited by 13 publications

(3 citation statements)

References 33 publications

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“…195) space group (JCPDS card no. 01‐074‐1296) . Secondary phases corresponding to V 2 O 5 (2 θ =31.35°), Sr 3 Ti 2 O 7 (2 θ =31.78°) and TiO 2 (2 θ =25.19°, 27.46°) were observed in 1 and 2 wt.…”

Section: Resultsmentioning

confidence: 95%

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

et al. 2020

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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.

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Section: Resultsmentioning

confidence: 95%

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

et al. 2020

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“…Based on this, it can be concluded that the modification of the surface of titanium oxide by sulfo groups does not affect its structure. Peaks were found in the structure of molybdenum-containing catalysts at 2θ values of 25.3, 37.9, 48.1, 54.0, and 55.0 corresponding to anatase, 48 as well as 27.2, 36, and 41 corresponding to the structure of rutile, 49 which was originally present in the initial titanium oxide (Figure 3). No sharp diffraction peak of Mo was detected in the obtained samples, which may be due to a similar ion radius of Mo 6+ (0.59 Å) and Ti 4+ (0.65 Å), which led to the fact that Mo 6+ was well dispersed on a titanium dioxide carrier or was included in the titanium dioxide matrix in an amorphous form.…”

Section: Characterization Of Supports and Catalystsmentioning

confidence: 99%

Combined Heterogeneous Catalyst Based on Titanium Oxide for Highly Efficient Oxidative Desulfurization of Model Fuels

et al. 2022

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In this work, new heterogeneous Mo-containing catalysts based on sulfonic titanium dioxide were developed for the oxidation of sulfur-containing model feed. The synergistic effect of molybdenum and sulfonic group modifiers allows for enhancing catalytic activity in dibenzothiophene oxidative transformation, and a strong interaction between support and active component for thus obtained catalysts provides increased stability for leaching. For the selected optimal conditions, the Mo/TiO2-SO3H catalyst exhibited 100% DBT conversion for 10 min (1 wt % catalyst, molar ratio of H2O2:DBT, 2:1; 80 °C). Complete oxidation of DBT in the presence of the synthesized catalyst is achieved when using a stoichiometric amount of oxidizing agent, which indicates its high selectivity. The enhanced stability for metal leaching was proved in recycling tests, where the catalyst was operated for seven oxidation cycles without regeneration with retainable activity in DBT-containing model feed oxidation with hydrogen peroxide under mild reaction conditions. In 30 min of the reaction (H2O2:S = 2:1 (mol), 0.5% catalyst, 5 mL of acetonitrile, 80 °C), it was possible to reduce the content of sulfur compounds in the diesel fraction by 88% (from 5600 to 600 ppm).

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“…To the best of our knowledge, TiO 2 has been considered an important catalyst in the treatment of various air and water pollutants, because of its intrinsic properties, such as strong oxidizing powder, chemical inertness, and long-term stability. There are many reports on the photocatalytic activity of containing TiO 2 composites [12][13] O ( the molar ratio is 1.6:1:2) together with carnelian mortar, and then sintering the precursor powder at 900 ℃ in air for 10 h. The preparation of TiO 2 /La 2 Zr 2 O 7 composites was carried out as follows. An appropriate amount of La 2 Zr 2 O 7 was dissolved in distilled water with vigorous stirring, which was named as solution A.…”

Section: Introductionmentioning

confidence: 99%

Synthesis、Structure and Catalytic Activity of TiO2/ La2Zr2O7 Nanocomposites

Tong

Zhao

Huo

et al. 2011

AMR

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TiO2/La2Zr2O7 composites were fabricated by sol-gel method. The composites were characterized by X-ray powder diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS) and Brunauer-Emmett-Teller (BET) nitrogen adsorption. The results showed that TiO2 was uniformly coated on the surface of La2Zr2O7 powders. The BET surface area of TiO2/La2Zr2O7 composites was 26.78 m2/g, which was larger than that of La2Zr2O7. Also, the photodegradation of methyl orange was used to evaluate its photocatalytic property. It was found that TiO2/La2Zr2O7 composites showed good photocatalytic activity and the decomposition of methyl orange had basically completed within 30 min.

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Influence of alkaline earth metal on acid–base characteristics of V2O5/MO–TiO2 (M=Ca, Sr and Ba) catalysts

Cited by 13 publications

References 33 publications

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

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

Combined Heterogeneous Catalyst Based on Titanium Oxide for Highly Efficient Oxidative Desulfurization of Model Fuels

Synthesis、Structure and Catalytic Activity of TiO<sub>2</sub>/ La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> Nanocomposites

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Influence of alkaline earth metal on acid–base characteristics of V2O5/MO–TiO2 (M=Ca, Sr and Ba) catalysts

Cited by 13 publications

References 33 publications

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

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

Combined Heterogeneous Catalyst Based on Titanium Oxide for Highly Efficient Oxidative Desulfurization of Model Fuels

Synthesis、Structure and Catalytic Activity of TiO<sub>2</sub>/ La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> Nanocomposites

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

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