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A novel core–shell nanocomposite Ni–Ca@mSiO2 for benzophenone selective hydrogenation

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Abstract

A novel core–shell nanocomposite Ni–Ca@mSiO2 was first prepared by a modified Stöber method in this paper. It has a core–shell structure with Ni (about 8 nm in diameter) and Ca as the cores and mesoporous silica as the outer shell, as proven by the transmission electron microscopy. This nanocomposite exhibited good catalytic performance in the selective hydrogenation of benzophenone, with 96.1% conversion and 94.9% selectivity for benzhydrol under relatively mild reaction conditions. It was demonstrated that addition of small amounts of alkaline Ca can not only markedly improve the dispersion of the active species but also tune the acid–base property of this nanocomposite, resulting in the efficient suppression of benzhydrol dehydration to achieve a high selectivity. Furthermore, the core–shell nanocomposite Ni–Ca@mSiO2 can be recycled four runs without appreciable loss of its initial activity, more stable than the traditional supported nanocatalyst Ni–Ca/mSiO2. It was suggested that the outer mesoporous silica shell of Ni–Ca@mSiO2 can prevent both the aggregation and the leaching of the active Ni species, accounting for its relatively good stability.

A magnetic core–shell nanocomposite Ni–Ca@mSiO2 exhibited good activity, selectivity, and reusability in benzophenone selective hydrogenation.

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Acknowledgments

Financial support by the National Natural Science Foundation of China (21376060 and 21676068) and the Natural Science Foundation of Hebei Province (B2014201024) is gratefully acknowledged.

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    Authors and Affiliations

    1. Key Laboratory of Chemical Biology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, People’s Republic of China

      Xue Han, Wenhui Feng, Xiaoning Chu, Hailong Chu, Libo Niu & Guoyi Bai

    2. Hebei Geological and Mineral Central Laboratory, Baoding, 071051, People’s Republic of China

      Xue Han

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    1. Xue Han
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    Correspondence to Guoyi Bai.

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    Han, X., Feng, W., Chu, X. et al. A novel core–shell nanocomposite Ni–Ca@mSiO2 for benzophenone selective hydrogenation. J Nanopart Res 19, 79 (2017). https://doi.org/10.1007/s11051-017-3768-z

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