Add time:08/11/2019         Source:sciencedirect.com

Supported bimetallic nanoparticles (NPs) are extensively used as efficient oxidation catalysts. A series of Au–Ni bimetallic alloy NP catalysts with Au:Ni mole ratios varying from 1:0.35 to 1:4.76 was successfully synthesized via impregnation and H2 reduction. The catalysts are supported by a metal–organic framework MIL-101. For comparison, monometallic Au/MIL-101 with an Au loading amount of 2.97 wt% and Ni/MIL-101 with a Ni loading amount of 2.11 wt% were also prepared. The catalysts were thoroughly characterized through X-ray diffraction, N2 adsorption–desorption isotherms, transmission electron microscopy (TEM), scanning TEM with line mapping energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and inductively coupled plasma atomic emission. Characterization results suggested that the AuNi bimetallic NP catalysts were homogeneously deposited on the MIL-101 surface, and an AuNi alloy structure was formed. The bimetallic Au–Ni and monometallic catalysts were evaluated for the oxidation of benzyl alcohol under O2 atmosphere. The bimetallic AuNi/MIL-101-1 catalyst displayed a higher catalytic activity under identical conditions compared with the monometallic catalysts due to the synergistic effects between Au and Ni metals. The Au–Ni/MIL-101-1 catalyst with an Au–Ni mole ratio of 1:0.35 exhibited the highest turnover frequency value of 15.4 h−1 for the oxidation of benzyl alcohol. In addition, the bimetallic AuNi/MIL-101-1 catalysts could be recovered easily by centrifugation and used repetitively for at least four times. These features make the catalysts particularly attractive in benzaldehyde synthesis.

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