Author(s)

Jiaqi Si, Lin Li, Yanji Zhang, Ji-Cheng Zhou^*, Wenbing Ouyang

Key Laboratory of Green Catalysis and Reaction Engineering, Department of Education, College of Chemical Engineering, Xiangtan University, Xiangtan, China.

A novel complex nano-structured Au@T_iO₂ gold catalyst has been prepared. Au precursor could be transformed into Au@T_iO₂/MCM-22 with the complex nano-structured using two different methods. Samples were characterized by XRD, FT-IR, UV-vis, TEM, ICP-AES and N₂ adsorption-desorption. It is found that gold was anchored on the T_iO₂/MCM-22 as small size and uniform particles with the average diameters in the range of 5 - 9 nm. Catalytic results show that such nano-gold catalysts display excellent catalytic performance for cyclohexane oxidation. Au@T_iO₂/MCM-22 catalyst with the gold content of 0.5 wt% exhibits extremely exceptionally catalytic activity (12.81%) and high turnover frequency (52,121 h^-1), which may be ascribed to the synergistic effects of Au and T_iO2 in the complex nano-structured catalyst Au@T_iO₂/ MCM-22. Because of the strong metal support interaction, aggregation of active sites (Au nanoparticles) during the oxidation reaction is effectively prohibited and the catalytic activity is essentially retained.

Jiaqi Si, Lin Li, Yanji Zhang, Ji-Cheng Zhou, Wenbing Ouyang

Si, J. , Li, L. , Zhang, Y. , Zhou, J. and Ouyang, W. (2017) Preparation of Novel Complex Nano-Structured Gold Catalyst Au@T_iO₂/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation. Modern Research in Catalysis, 6, 15-29. doi: 10.4236/mrc.2017.61002.