Preparation of Novel Complex Nano-Structured Gold Catalyst Au@T<sub>i</sub>O<sub>2</sub>/MCM-22, Characterization and Remarkably Catalytic Performance for Cyclohexane Oxidation

Abstract

A novel complex nano-structured Au@TiO 2 gold catalyst has been prepared. Au precursor could be transformed into Au@TiO 2 /MCM-22 with the complex nano-structured using two different methods. Samples were characterized by XRD, FT-IR, UV-vis, TEM, ICP-AES and N 2 adsorption-desorption. It is found that gold was anchored on the TiO 2 /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@TiO 2 /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 TiO 2 in the complex nano-structured catalyst Au@TiO 2 / 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.

Cu(II)/Z4A as an Efficient Nanocomposite for Oxidative Degradation of Indole and Optimization of Effective Factors via RSM Procedure

“…Therefore, designing a suitable catalyst for indole purification is necessary. One of the recent ways for creating such a design is fixing photocatalysts on the surface of zeolites which has been providing an excellent opportunity for improving zeolites efficiency [17][18][19]. For instance, in an experimental study, Mihajlovic et al modified natural zeolite with Fe(III), and found that this way increased the adsorption capacity of the zeolite [20].…”

Selective Oxidation of Cyclohexane to KA Oil Over Ce-Alpo-18 Molecular Sieves

“…Of late many works have been carried out using molecular oxygen as oxidant and it proves its versatility and superiority over other oxidants [9]. The product of cyclohexane oxidation KA oil is used as a raw material to prepare adipic acid and caprolactum [10]. Of late, the oxidation of cyclohexane to cyclohexanol and cyclohexanone is developed in heterogeneous system.…”