Development of a high-performance nanostructured V2O5/SnO2 catalyst for efficient benzene hydroxylation

Makgwane, Peter R.; Ray, Suprakas Sinha

doi:10.1016/j.apcata.2014.12.024

Cited by 22 publications

(9 citation statements)

References 49 publications

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“…According to the literatures [17,18,42] and the observations in our reactions, we propose a possible mechanism as (Table 3). Various aromatics were hydroxylated to the corresponding phenols in good to excellent yields, whereas benzenes with electron-withdrawing substituents were less reactive and more drastic reaction conditions were needed (Table 3, entries 6-8).…”

Section: Resultssupporting

confidence: 51%

“…Among these oxidants, H 2 O 2 is a good choice since it is an environmentally benign oxidant, quite inexpensive, ready-made, easily handled, and efficient with nontoxic water as the sole by-product. A large number of catalysts, including NiII(tepa) [9], mesostructured V/mp-C 3 N 4 [10], VPO@GO [11], CuCr 2 O 4 spinel nanoparticles [12], AlPO 4 /ZnAlPO 4 [13], nanostructured CuFe [14], Vanadium-containing mesoporous carbon [15], V-MimSaIm-PMoV [16], nanostructured V 2 O 5 / SnO 2 [17], PMO/VO(acac) 2 [18], and other complexes [19][20][21][22][23][24], have been developed for this catalytic conversion. Some of these procedures, however, are often affected by a low conversion or poor selectivity.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Silica Supported Ionic Liquids for Highly Selective Hydroxylation of Aromatics with Hydrogen Peroxide under Solvent-free Conditions

Fang

2017

J. Mex. Chem. Soc.

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A series of silica supported functionalized ionic liquid catalysts have been prepared and tested in the hydroxylation of aromatics to phenols with H2O2 under solvent-free conditions. The properties of the heterogeneous catalytic system were studied by tuning various reaction parameters including selection of catalyst, amount of the catalyst, influences of reaction time and temperature. Among the catalysts, CuCl3-IL-SiO2 exhibited the highest efficiency in the hydroxylation of aromatics to phenols under the optimized condition along with good recycle performance.

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Section: Resultssupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Preparation of Silica Supported Ionic Liquids for Highly Selective Hydroxylation of Aromatics with Hydrogen Peroxide under Solvent-free Conditions

Fang

2017

J. Mex. Chem. Soc.

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“…For extending this approach to surface modifications of materials, in this work we consider the SnO 2 -V 2 O 5 system. In fact, even this system is known from heterogeneous catalysis 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 , with evidence that surface Sn-O-V bonds are the active species 6 . During the course of the study, a peculiar material structure was evidenced, featuring SnO 2 nanocrystals wrapped by V 2 O 5 -like layers.…”

mentioning

confidence: 99%

Inorganic Photocatalytic Enhancement: Activated RhB Photodegradation by Surface Modification of SnO2 Nanocrystals with V2O5-like species

Epifani

Kačiulis

Mezzi

et al. 2017

Sci Rep

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9SnO 2 nanocrystals were prepared by precipitation in dodecylamine at 100 °C, then they were reacted with vanadium chloromethoxide in oleic acid at 250 °C. The resulting materials were heat-treated at various temperatures up to 650 °C for thermal stabilization, chemical purification and for studying the overall structural transformations. From the crossed use of various characterization techniques, it emerged that the as-prepared materials were constituted by cassiterite SnO 2 nanocrystals with a surface modified by isolated V(IV) oxide species. After heat-treatment at 400 °C, the SnO 2 nanocrystals were wrapped by layers composed of vanadium oxide (IV-V mixed oxidation state) and carbon residuals. After heating at 500 °C, only SnO 2 cassiterite nanocrystals were obtained, with a mean size of 2.8 nm and wrapped by only V 2 O 5 -like species. The samples heat-treated at 500 °C were tested as RhB photodegradation catalysts. At 10 −7 M concentration, all RhB was degraded within 1 h of reaction, at a much faster rate than all pure SnO 2 materials reported until now.Surface management is critical in such fields as heterogeneous catalysis, gas-sensors, photocatalysis and related applications, for obvious reasons of available reaction sites, and appears even more critical when complex systems are investigated. Indeed, several material features play a critical role in determining the final properties: the catalyst habit (i.e. size and shape, strictly correlated to dangling bonds of active species), surface oxygen vacancies (often correlated with in situ formation of active intermediates, such for instance peroxides), oxidation states of surface atoms are among the most relevant actors involved in reactant transformation during the process under investigation. It was recently highlighted 1,2 that classical heterogeneous catalysis can provide suggestive concepts of surface modifications. In fact, the nanocrystalline version of well-known combinations of catalytic oxides (COX) supported onto another metal oxide (support oxide, SOX) like TiO 2 -V 2 O 5 and TiO 2 -WO 3 , featured evident synergistic effects as concerns the enhancement of the gas-sensing response. It was argued that this occurred because, if the crystallite size of the SOX is decreased more and more, the relative electronic contribution generated by the reactions at the COX is increasingly important, due to the enhanced surface/volume atoms ratio in nanocrystalline materials. For extending this approach to surface modifications of materials, in this work

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“…The selected area electron diffraction (SAED) pattern of an individual microtube shown in the inset of Figure e displays a combined diffraction pattern of spots and rings. The spots labeled as 1, 2 and 3 are indexed to the (411), (002) and (331) planes of orthorhombic V 2 O 5 nanorods,, while the diffraction rings from inside out are indexed to the (110), (101), (111) and (301) planes of the tetragonal SnO 2 nanoparticles ,. The high‐resolution TEM (HR‐TEM) image (Figure f) of the microtube surface shows the lattice fringes with interplanar distances of 0.343 nm on the nanorod and 0.337 nm on the nanoparticle, corresponding to the (110) lattice plane of orthorhombic V 2 O 5 phase and the (110) lattice plane of tetragonal SnO 2 phase, respectively.…”

Section: Resultsmentioning

confidence: 99%

Microtubular SnO₂/V₂O₅ Composites Derived from Cellulose Substance as Cathode Materials of Lithium‐ion Batteries

Huang³

et al. 2017

ChemistrySelect

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Three‐dimensional microtubular SnO2/V2O5 composites with various SnO2 contents (2.2, 12.1 and 25.2 wt%) were fabricated by a facile sol−gel method employing natural cellulose substance (e. g., filter paper) as template. Thin VxOy/SnO2 gel layer was first deposited onto the surfaces of the cellulose microfibers of the filter paper through a dipping process, and then the as‐prepared VxOy/SnO2/cellulose composites were calcined in air to give the SnO2/V2O5 composites. The obtained composites inherit the morphology of the initial cellulose substance on the micrometer scale and consist of intricate microtubes composed of V2O5 nanorods with SnO2 nanoparticles anchored on the surfaces. Due to the unique three‐dimensional network structure of the composites and the synergetic effect of the V2O5 and SnO2 species, the SnO2/V2O5 composites displayed enhanced electrochemical performances when employed as cathode materials for lithium‐ion batteries. The composite with a SnO2 loading content of 12.1 wt% retained a stable discharge capacity of 126 mAh g−1 after 150 discharge/charge cycles at a current density of 0.1 A g−1. The three‐dimensional microtubular structure inherited from the cellulose substance improves the structural stability of the electrode materials and facilitates the diffusion of lithium ions, and the existence of SnO2 with an appropriate loading content enhances the conductivity of the composites.

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Development of a high-performance nanostructured V2O5/SnO2 catalyst for efficient benzene hydroxylation

Cited by 22 publications

References 49 publications

Preparation of Silica Supported Ionic Liquids for Highly Selective Hydroxylation of Aromatics with Hydrogen Peroxide under Solvent-free Conditions

Preparation of Silica Supported Ionic Liquids for Highly Selective Hydroxylation of Aromatics with Hydrogen Peroxide under Solvent-free Conditions

Inorganic Photocatalytic Enhancement: Activated RhB Photodegradation by Surface Modification of SnO2 Nanocrystals with V2O5-like species

Microtubular SnO₂/V₂O₅ Composites Derived from Cellulose Substance as Cathode Materials of Lithium‐ion Batteries

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Development of a high-performance nanostructured V2O5/SnO2 catalyst for efficient benzene hydroxylation

Cited by 22 publications

References 49 publications

Preparation of Silica Supported Ionic Liquids for Highly Selective Hydroxylation of Aromatics with Hydrogen Peroxide under Solvent-free Conditions

Preparation of Silica Supported Ionic Liquids for Highly Selective Hydroxylation of Aromatics with Hydrogen Peroxide under Solvent-free Conditions

Inorganic Photocatalytic Enhancement: Activated RhB Photodegradation by Surface Modification of SnO2 Nanocrystals with V2O5-like species

Microtubular SnO2/V2O5 Composites Derived from Cellulose Substance as Cathode Materials of Lithium‐ion Batteries

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Microtubular SnO₂/V₂O₅ Composites Derived from Cellulose Substance as Cathode Materials of Lithium‐ion Batteries