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Issue 43, 2017
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Size dependence of gold clusters with precise numbers of atoms in aerobic oxidation of d-glucose

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Abstract

Size-dependence is an important factor in gold nanocatalysis. In this study, we explored 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 clusters, immobilized on activated carbon (AC) and used as heterogeneous catalysts, were characterized by transmission electron microscope (TEM), BET 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 observed a distinct size dependence of the gold nanocluster in the oxidation reactions, which follows as Au144(PET)60/AC > Au38(PET)24/AC > Au25(PET)18/AC. It was primarily determined by the surface area of the nanoscopic Au nanocluster. Further, the turnover frequency (TOF) for the Au144(PET)60/AC catalyst was found to be 2.3 s−1, which is comparable with that for Au/EC300 and much higher than those for the commercial Pd/AC and Pd-Bi/AC catalysts under the identical reaction conditions. On the whole, the core size of the gold nanoclusters played an important role in the catalytic process.

Graphical abstract: Size dependence of gold clusters with precise numbers of atoms in aerobic oxidation of d-glucose

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Supplementary files

Article information


Submitted
04 Sep 2017
Accepted
10 Oct 2017
First published
11 Oct 2017

Nanoscale, 2017,9, 16879-16886
Article type
Paper

Size dependence of gold clusters with precise numbers of atoms in aerobic oxidation of D-glucose

J. Zhang, Z. Li, J. Huang, C. Liu, F. Hong, K. Zheng and G. Li, Nanoscale, 2017, 9, 16879
DOI: 10.1039/C7NR06566C

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