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Size Dependence of Gold Clusters with Precise Numbers of Atom in Aerobic Oxidation of D-Glucose


Size-dependence is an important issue in the gold nanocatalysis. In this study, we explore the catalytic performance of atomically precise Aun(PET)m nanocluster catalysts (where, PET = phenylethanethiolate) of different gold atoms and sizes, including Au25(PET)18 (~1.2 nm), Au38(PET)24 (~1.5 nm), and Au144(PET)60 (~1.9 nm) nanoclusters. These Aun(PET)m gold cluster, immobilized on activated carbon (AC) and used as heterogeneous catalysts, are characterized by transmission electron microscope (TEM), BET, and as well as X-ray photoelectron spectroscopy (XPS). They showed good catalytic activity in the aerobic oxidation of D-glucose into gluconic acid (or gluconates) with ∼98% selectivity. We observe a distinct size dependence on the gold nanocluster in the oxidation reactions, which follows as Au144(PET)60/AC > Au38(PET)24/AC > Au25(PET)18/AC. It is primarily determined by the surface area of the nanoscopic Au nanocluster. Further, the turnover frequency (TOF) for the Au144(PET)60/AC catalyst is found to be 2.3 s-1, which is comparable with that for Au/EC300 and much higher than these for the commercial Pd/AC and Pd-Bi/AC catalysts under the identical reaction conditions. In all, the core size of the gold nanoclusters plays an important role in the catalytic process.

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Publication details

The article was received on 04 Sep 2017, accepted on 10 Oct 2017 and first published on 11 Oct 2017

Article type: Paper
DOI: 10.1039/C7NR06566C
Citation: Nanoscale, 2017, Accepted Manuscript
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    Size Dependence of Gold Clusters with Precise Numbers of Atom in Aerobic Oxidation of D-Glucose

    J. Zhang, Z. Li, J. Huang, C. Liu, F. Hong, K. zheng and G. Li, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06566C

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