A novel complex nano-structured Au@TiO2 gold catalyst has been prepared. Au precursor could be transformed into Au@TiO2/MCM-22 with the complex nano-structured using two different methods. Samples were characterized b...A novel complex nano-structured Au@TiO2 gold catalyst has been prepared. Au precursor could be transformed into Au@TiO2/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 TiO2/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@TiO2/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 TiO2 in the complex nano-structured catalyst Au@TiO2/ 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.展开更多
文摘A novel complex nano-structured Au@TiO2 gold catalyst has been prepared. Au precursor could be transformed into Au@TiO2/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 TiO2/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@TiO2/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 TiO2 in the complex nano-structured catalyst Au@TiO2/ 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.
