Abstract
It is known that small gold clusters (average diameter: ~ 1.2 nm) stabilized by poly(N-vinyl-2-pyrrolidone) (Au:PVP) exhibit size-specific catalysis in aerobic oxidation reactions. A recent matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) study of Au:PVP revealed that Au clusters with the magic sizes of 34 and 43 were preferentially produced. Here, we reported how the doping of palladium (Pd) into Au:PVP affected the catalytic performance. MALDI-MS analysis of Pd-doped Au:PVP showed that a single Pd atom was selectively doped by co-reduction of Au and Pd precursor ions and that PdAu33 and PdAu43 were produced as the dominant species. Extended X-ray absorption fine structure (EXAFS) analysis indicated that a Pd atom was located at the exposed surface of the Au:PVP clusters. It was found that single Pd atom doping enhanced the catalytic activity for aerobic oxidation of benzyl alcohol and provided hydrogenation catalysis in a chemoselective manner to the C=C bonds over the C=O bonds.
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Acknowledgements
This research was financially supported by the Elements Strategy Initiative for Catalysts and Batteries (ESICB) and by Grants-in-Aid for Scientific Research (Nos. 17H01182 and 26248003) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan, and CREST (JPMJCR14L4), Japan Science and Technology Agency. The synchrotron radiation experiments were performed with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) as 2017A0910 and 2017A1492.
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Hayashi, S., Ishida, R., Hasegawa, S. et al. Doping a Single Palladium Atom into Gold Superatoms Stabilized by PVP: Emergence of Hydrogenation Catalysis. Top Catal 61, 136–141 (2018). https://doi.org/10.1007/s11244-017-0876-z
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DOI: https://doi.org/10.1007/s11244-017-0876-z