[Zurück]

C. Garcia Yago, N. Barrabés-Rabanal, G. Rupprechter:
"Cluster-support interaction study: effect of cluster size and oxide material under oxidation processes";
Poster: 17th Austrian Chemistry Days 2017 - Joint Meeting of the Swiss & Austrian Chemical Societies, Salzburg; 25.09.2017 - 28.09.2017.

Heterogeneous catalysis by metal nanoparticle supported on oxides, are often limited in their activity/selectivity, due to variations in metal particle size, surface structure and bonding to the support. Thiolate-protected Au nanoclusters had shown enhancement catalytic activity in several processes in comparison with the common nanoparticles catalysts. Atomically designed metal clusters offer the possibility to design well-defined and truly homogeneous surfaces leading to optimal catalysts for reaction mechanism studies. Although, the stability of the cluster structure and type of interaction with the support during the thiolate ligands removal treatments and under reaction conditions represent key understanding for their catalytic application.
Therefore, an in-depth investigation of the effect of the cluster size (Au25 vs Au144), the staple configuration (short vs long staple) and the ligand interactions depending on the material support nature (TiO2, SiO2 and ZrO2) is the focused on the present work. Au25(SC2H4Ph)18 and Au144(SC2H4Ph)60 clusters has been synthesized and isolated, the cluster purity and properties have been characterized by UV-Vis, FTIR and MALDI[2]. Each clusters has been supported on the different oxide materials (SiO2, TiO2 and ZrO2) with a 2% wt by impregnation. The cluster characterization have been performance using optical spectroscopy (UV-vis) and infrared spectroscopy (FIR and MIR).
References
1) Brust, M.; Walker, M.; Bethell, D.; J Chem Soc Chem Comm, 1994, 801-802
2) Huifeng Q. Rongchao J; Chem. Mater, 2011, 23, 2209-2217