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Liquid-phase epoxidation of cyclooctene with O2 over CoOx/SiO2 catalyst prepared by sol–gel method

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Abstract

A series of CoOx/SiO2 catalysts has been prepared by the sol–gel method and characterized with XRD, N2 adsorption/desorption, diffuse reflectance UV–vis spectroscopy, Raman spectroscopy as well as TPR techniques. This type of material is highly active and selective for the epoxidation of cyclooctene with atmospheric molecular oxygen. Although all the catalysts attained at different pH values are amorphous, their catalytic activities are remarkably different because the pH values influence not only the coordination state of Co species but also the textural structures of the prepared catalysts, in which CoOx/SiO2 obtained at pH below 5 is highly active and selective for the epoxidation of cyclooctene with atmospheric O2. The prepared CoOx/SiO2 catalysts are highly stable and can be recycled at least four times without significant loss of activity and selectivity.

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Acknowledgment

This work is supported by the National Science Foundation of China (No. 20971095), the Science Foundation of Shanxi Province (No. 2010011014-4) and the Foundation for returned overseas scholars of Shanxi Province (No. 2008-10).

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Authors and Affiliations

  1. Institute of Special Chemicals, Taiyuan University of Technology, 79 West Yinze Street, Taiyuan, 030024, People’s Republic of China

    Binbin Fan, Hang Qi, Xiufeng Shi & Ruifeng Li

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  1. Binbin Fan
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  2. Hang Qi
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  3. Xiufeng Shi
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  4. Ruifeng Li
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Correspondence to Binbin Fan or Ruifeng Li.

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Fan, B., Qi, H., Shi, X. et al. Liquid-phase epoxidation of cyclooctene with O2 over CoOx/SiO2 catalyst prepared by sol–gel method. J Sol-Gel Sci Technol 60, 91–97 (2011). https://doi.org/10.1007/s10971-011-2554-0

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