Exploring the Potential of Different-Sized Supported Subnanometer Pt Clusters as Catalysts for Wet Chemical Applications
Rötzer, Marian D.
Hedhili, Mohamed N.
Hogerl, Manuel Peter
Schweinberger, Florian F.
KAUST Grant NumberKSA-C0069/UKC0020
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AbstractThe use of physicochemical preparation techniques of metal clusters in the ultrahigh vacuum (UHV) allows for high control of cluster nuclearity and size distribution for fundamental studies in catalysis. Surprisingly, the potential of these systems as catalysts for organic chemistry transformations in solution has not been explored. To this end, single Pt atoms and Pt clusters with two narrow size distributions were prepared in the UHV and applied for the hydrogenation of p-chloronitrobenzene to p-chloroaniline in ethanol. Following the observation of very high catalytic turnovers (approaching the million molecules of p-nitroaniline formed per Pt cluster) and of size-dependent activity, this work addresses fundamental questions with respect to the suitability of these systems as heterogeneous catalysts for the conversion of solution-phase reagents. For this purpose, we employ scanning transmission electron microscopy (STEM) and X-ray photoelectron spectroscopy (XPS) characterization before and after reaction to assess the stability of the clusters on the support and the question of heterogeneity versus homogeneity in the catalytic process.
CitationRondelli M, Zwaschka G, Krause M, Rötzer MD, Hedhili MN, et al. (2017) Exploring the Potential of Different-Sized Supported Subnanometer Pt Clusters as Catalysts for Wet Chemical Applications. ACS Catalysis 7: 4152–4162. Available: http://dx.doi.org/10.1021/acscatal.7b00520.
SponsorsThis project was supported through collaboration with the King Abdullah University of Saudi-Arabia (Grant No. KSA-C0069/UKC0020). Further, U.H. and F.F.S. acknowledge financial support through DFG project HE3454/23-1. The authors thank Salim Sioud at the
PublisherAmerican Chemical Society (ACS)