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One-pot synthesis of molybdenum oxide nanoparticles encapsulated in hollow silica spheres: an efficient and reusable catalyst for epoxidation of olefins

Abstract

We report a one-pot synthesis of MoOx NPs encapsulated inside hollow silica spheres (MoOx@HSS) which act as an efficient and reusable heterogeneous catalyst in the epoxidation of olefins. A yolk–shell nanostructured MoOx-SiO2 composite, consisting of core MoOx NPs and permeable porous hollow silica spheres, was fabricated via a self-assembly approach using poly(acrylic acid) as an organic template and dodecyltrimethoxysilane as a pore-directing agent. On the basis of comprehensive structural analyses by FE-SEM, TEM, elemental mapping, N2 physisorption and Mo K-edge XAFS, we show that MoOx NPs of ca. 5.8 nm diameter are encapsulated within hollow silica spheres having randomly-arranged meso pores of ca. 2.1 nm diameter, while addition of excess amount of pore-directing agent leads to a deformation of yolk-shell nanostructure. The obtained yolk-shell nanostructured MoOx-SiO2 composite exhibits prominent reusability with a modest catalytic activity in the liquid-phase epoxidation of olefins with TBHP owing to the presence of protective silica shell, rendering it as an effective heterogeneous catalyst for transformation of olefins to the corresponding epoxides.

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Publication details

The article was received on 18 Jul 2017, accepted on 09 Aug 2017 and first published on 09 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA06288E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    One-pot synthesis of molybdenum oxide nanoparticles encapsulated in hollow silica spheres: an efficient and reusable catalyst for epoxidation of olefins

    Y. Kuwahara, N. Furuichi, H. Seki and H. Yamashita, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06288E

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