The gas-phase dehydrogenation of cyclohexanol to cyclohexanone over Cu-SiO2 catalysts
YAN Mengxiao, XIAO Yongshan, SHI Xianying, GE Hanqing*, LI Ting, SONG Yonghong, LIU Zhaotie, LIU Zhongwen
(Shaanxi Key Laboratory of Syngas Conversion, School of Cheistry & Chemical Engineering, Shaanxi Normal University， Xi′an 710119，Shaanxi，China)
Abstract:
A series of Cu-SiO2 samples with different contents of CuO was synthesized via the one-pot evaporation induced self-assembly method, and was evaluated as a catalyst for the gas-phase dehydrogenation of cyclohexanol to cyclohexanone. The catalysts were characterized by XRD, TG-DSC, TEM, and N2 adsorption-desorption at low temperatures. At the reaction temperature of 300 ℃, the Cu-SiO2 catalyst containing 10% CuO showed the best performance among the investigated samples, i.e., the initial conversion of cyclohexanol was over 90% and the selectivity of cyclohexanone was over 99%. From the results of the long-term reaction (50 h) and the regeneration of the used catalyst, the sintering of the metallic Cu particles was revealed to be responsible for the catalyst deactivation. These findings are important for the further development of a high-performance Cu-based catalyst for the titled reaction.
KeyWords:
cyclohexanol dehydrogenation; cyclohexanone; Cu; stability
