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《Chinese Journal of Catalysis》 2004-10
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Baeyer-Villiger Oxidation of Cyclohexanone to ε-Caprolactone over Hydrotalcite-Supported Sb Catalyst

LIU Yuan, CHEN Changlin *, XU Nanping (College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China)  
The Baeyer-Villiger (BV) oxidation of cyclohexanone to ε-caprolactone is an attractive process because poly(ε-caprolactone) is one of the most commonly used biodegradable polymers. With the increase in environmental concern, much more research is focused on developing efficient catalytic methods using green and cheap oxidants like hydrogen peroxide instead of peroxycarboxylic acids. In this work, the Sb catalyst supported on hydrotalcite (HT) was prepared by wetness impregnation of calcined hydrotalcite with a solution of SbCl 3, then dried and calcined at 450 ℃ for 5 h. The samples were characterized by XRD and TG-DTG. The XRD results suggested that the calcined Sb/HT recovered the original layered structure during the reaction process. The BV oxidation of cyclohexanone to ε-caprolactone on the Sb/HT catalyst was carried out in a three-necked glass flask equipped with a reflux condenser and a magnetical stirrer. The results indicated that 1.5%Sb/HT showed a high activity for the BV oxidation of cyclohexanone in the acetonitrile medium. The cyclohexanone conversion was about 42% and the selectivity for ε-caprolactone was over 94%. In a set of reuse experiments, there was almost no reduction of the catalyst activity and the selectivity for ε-caprolactone over the regenerated catalyst was almost the same as that on the fresh catalyst.
【Fund】: 江苏省材料化学工程重点实验室开放基金资助课题 (KJ0 3 0 16) .
【CateGory Index】: O643
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