The DICP research team headed by Prof. Hengyong Xu, in collaboration with the research group of Prof. Rongchao Jin of the Carnegie Mellon University, USA, has succeeded in the synthesizing of the Au25(SR)18(R=CH2CH2Ph) nano-cluster of 1nm in size via a “low temperature kinetic size controlling” method. The cluster could be supported on oxide carriers and utilized as a catalyst in the CO oxidation reaction.
In this work, it was found that the Au25(SR)18 nano-cluster could exist as an integral ensemble on the support, without the removing of the mercapto ligands. After pretreatment, this supported nano-cluster catalyst exhibited high activity for CO oxidation. Moreover, the existence of the mercapto ligands prevented the aggregation of gold, resulting in an excellent stability in a rather long period of time. Preliminary studies have shown that the active sites of the catalyst were locating in the perimeters formed from the contacting of the Au25(SR)18 nano-cluster with the oxide support.
The results of this work were published in the newly appearing issue of ACS Nano (ACS Nano, 2012, 6(7)，6014-6022), and the reviewer of the paper has remarked that this was a novel discovery of great significance.