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PVP-assisted Sn-Ti microspheres for the efficient B–V oxidation of cyclohexanone

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Abstract

New Sn-Ti microspheres were first successfully synthesized by a PVP-assisted sol-gel method in this paper, and their performance in the B–V oxidation of cyclohexanone was investigated. The XRD, N2 sorption, SEM, Py-IR, UV–Vis, XPS, EDX, Elemental mapping and TEM characterization techniques were utilized to investigate their physical and chemical properties. Based on the proposal possible formation mechanism, in the MTS-x sample synthesis procedure, the introduction of PVP as a stabilizer and dispersant can coordinate the hydrolysis rate of two different precursors resulting in the hindrance of their agglomerations. And the HDA as a precipitation accelerator and morphology control agent can be beneficial to the formation of spheres by increasing the hydrogen-bonding interactions. The MTS-12 as well as the weight percent of tin to titanium species of 12 with specific regular microspheres has the highest cyclohexanone conversion of 97.8% and the highest ε-caprolactone selectivity of 98.2%, which is better than the bulk Sn-TiO2 catalyst even though that the weight percent of tin to titanium species was 18. The catalysts with higher accessible active sites and shorter diffusion channels would provide a valuable theoretic reference for the industrial process of the B–V oxidation of cyclohexanone for the preparation of caprolactone.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2019YFD1101204); University-Industry Cooperation Projects of Jiangsu Province (No. BY20200011) and Open Project of Beijing Key Laboratory for Enze Biomass and Fine Chemicals.

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  1. College of Chemical Engineering, Nanjing Tech University, Nanjing, 210009, People’s Republic of China

    Chuanfa Liu, Zhiwei Zhou, Guangbo Xia, Yangyang Liu, Binbin He, Fanqing Li & Wenliang Wu

  2. Technology and Finance Service Center of Jiangsu Province, Productivity Center of Jiangsu Province, Nanjing, 210042, People’s Republic of China

    Juan Qin

  3. School of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing, 100012, People’s Republic of China

    Peiyong Sun

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  1. Chuanfa Liu
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Liu, C., Zhou, Z., Qin, J. et al. PVP-assisted Sn-Ti microspheres for the efficient B–V oxidation of cyclohexanone. J Porous Mater 28, 1215–1225 (2021). https://doi.org/10.1007/s10934-021-01068-2

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