Crystallization of an Ordered Mesoporous Nb–Ta Oxide

Katou, Tokumitsu; Lee, Byongjin; Lu, Daling; Kondo, Junko N.; Hara, Michikazu; Domen, Kazunari

doi:10.1002/anie.200250263

Cited by 95 publications

(68 citation statements)

References 21 publications

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“…The particle size of carbon microspheres with a short reaction time of 10 h is small. In brief, the creation of hollow structure of CoMn 2 O 4 microspheres involves two key strategies: the converting of metal source to nucleates and the loading of them into carbon spheres [24,25], and the formation of hollow CoMn 2 O 4 microspheres during annealing [26]. C-CoMn 2 O 4 precursors were formed during the solvothermal treatment and the nucleates loading depth is thin enough.…”

Section: Resultsmentioning

confidence: 99%

Controllable synthesis of spinel nano-CoMn2O4 via a solvothermal carbon templating method and its application in lithium ion batteries

Zhang

Wang

Jiu

et al. 2015

Electrochimica Acta

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Section: Resultsmentioning

confidence: 99%

Controllable synthesis of spinel nano-CoMn2O4 via a solvothermal carbon templating method and its application in lithium ion batteries

Zhang

Wang

Jiu

et al. 2015

Electrochimica Acta

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“…As important solid acids, transitionmetal oxides are currently attracting considerable attention due to their unique properties and broad range of potential applications. During the last decades, monometallic oxides such as MgO [9][10][11], SnO 2 [12][13][14], WO 3 [12,14], ZrO 2 [12,14,15], TiO 2 [12,14,16], Al 2 O 3 [17], Nb 2 O 5 [12,14,18], Ta 2 O 5 [12,14,19], and bimetallic oxides such as Nb-Ta oxides [12,14,20,21], Mg-Ta oxides [21,22], Nb-W oxides [23], Sn/W oxides [24], Zr-W oxides [25,26], and WO 3 -TiO 2 [27] have all been studied. The transition-metal centers in the inorganic frameworks of porous structures also possess variable oxidation states and empty d-orbitals, which allow electron transfer to occur between the reactants and active sites during the catalytic process [28].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of highly active Sn/W mixed transition-metal oxides as solid acid catalysts

Yang

Lengyuan

et al. 2011

Transition Met Chem

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Catalytically active Sn/W mixed transition-metal oxides were prepared by calcination of the corresponding Sn/W hydroxide precursors at different temperatures. The obtained mixed oxides were characterized by physicochemical and spectroscopic methods. With variation of the molar ratios of Sn/W, the prepared Sn/W mixed oxide catalysts had different reaction activities. Thus, the Sn/W-2-800 oxide acted as an effective heterogeneous catalyst for the Baeyer-Villiger oxidation of ketones and the Friedel-Crafts reaction. Many ketones, as well as benzyl alcohol and acetic anhydride, were transformed into the corresponding products with high conversion and selectivity. The catalysts can be easily separated from the reaction mixtures and can be reused for at least five cycles without significant loss of activity.

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“…These materials have been used in the isomerization of alkanes and other petrochemical processes such as alkylation of aromatics and hydrocarbon cracking [105]. Monometallic oxides such as MgO [106], SnO2 [107], WO3 [108], ZrO2 [109], TiO2 [110], Al2O3 [111], Nb2O5 [112], Ta2O5 [113], and bimetallic oxides such as Nb-Ta oxides [114,115], Mg-Ta oxides [116], Nb-W oxides [117], Sn-W oxides [118], Zr-W oxides [119], and WO3-TiO2 [120,121] have been extensively explored. The transition-metal centers in the inorganic frameworks of porous structures also possess variable oxidation states and empty d-orbitals, which allow electron transfer to occur between the reactants and active sites during the catalytic process [122].…”

Section: Mo-sno2 Metal Oxide Nanocomposite Catalystsmentioning

confidence: 99%

Sn-based catalysts for Baeyer-Villiger oxidations by using hydrogen peroxide as oxidant

Cui

Shi

2016

Sci. China Mater.

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Baeyer-Villiger (BV) oxidation is one of the most important transformation reactions in synthetic organic chemistry. Catalytic versions of the BV oxidation are particularly attractive in practical applications, because the catalytic transformation substantially simplifies reaction process while minimizing reactant consumption as well as waste production. Further benefits are expected from replacing peracids, the traditionally used oxidant, by low cost and environmentally friendly hydrogen peroxide (H2O2). This review will first introduce very briefly the features of BV oxidation reactions, and the corresponding oxidants traditionally used. Afterwards, the emphasis will be placed on the specific Sn-based catalysts, their performance comparison for the BV oxidation reaction by using H2O2 as oxidant, and the catalytic mechanisms of most Sn-based catalysts reported so far, including homogeneous Sn-based catalysts (such as Sn-based fluorous biphase system catalysts), heterogeneous Sn-based catalysts (such as Sn-based zeolite catalysts, Sn-based mesoporous composites, Sn-incorporated clay catalysts, Sn-based metal oxide composites and polymer supported Sn catalysts). Finally, the Sn-based catalysts for BV oxidation are outlooked for their potentials and perspectives in enhancing the performance and then accelerating the practical applications of BV oxidations by using H2O2. The developing direction of the Sn-based catalytic BV reaction is also illustrated.

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Crystallization of an Ordered Mesoporous Nb–Ta Oxide

Cited by 95 publications

References 21 publications

Controllable synthesis of spinel nano-CoMn2O4 via a solvothermal carbon templating method and its application in lithium ion batteries

Controllable synthesis of spinel nano-CoMn2O4 via a solvothermal carbon templating method and its application in lithium ion batteries

Fabrication of highly active Sn/W mixed transition-metal oxides as solid acid catalysts

Sn-based catalysts for Baeyer-Villiger oxidations by using hydrogen peroxide as oxidant

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