3D Ruthenium Nanoparticle Covalent Assemblies from Polymantane Ligands for Confined Catalysis

Yuanyuan Min, Houssein Nasrallah, Didier Poinsot, Pierre Lecante, Yann Tison, Hervé Martinez, Pierre Roblin, Andrea Falqui, Romuald Poteau, Iker del Rosal, Iann C. Gerber, Jean-Cyrille Hierso, M. Rosa Axet, Philippe Serp

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The synthesis of metal nanoparticle (NP) assemblies stabilized by functional molecules is an important research topic in nanoscience, and the ability to control interparticle distances and positions in NP assemblies is one of the major challenges in designing and understanding functional nanostructures. Here, two series of functionalized adamantanes, bisadamantanes and diamantanes bearing carboxylic acid or amine functional groups have been used as building blocks to produce, via a straightforward method, networks of ruthenium NP. Both the nature of the ligand and the Ru/ligand ratio affect the interparticle distance in the assemblies. The use of 1,3-adamantanedicarboxylic acid allows the synthesis of 3D networks of 1.7-1.9 nm Ru NP presenting interparticle distance of 2.5-2.7 nm. The surface interaction between Ru NP and the ligands were investigated spectroscopically using a 13C labeled ligand, as well as theoretically with Density Functional Theory (DFT) calculations. We found that Ru species formed during the NP assembly are able to partially decarbonylate carboxylic acid ligands at room temperature. Decarbonylation of a carboxylic acid at room temperature in the presence of dihydrogen usually occurs on catalysts at much higher temperature and pressure. This result reveals a very high reactivity of ruthenium species formed during network assembling. The Ru NP networks were found active catalysts for the selective hydrogenation of phenyl acetylene, reaching good selectivity towards styrene. Overall, we demonstrated that catalyst activity, selectivity, and NP network stability are significantly affected by Ru NP interparticle distance, and electronic ligand effects. As such, these materials constitute a unique set that should allow a better understanding of the complex surface chemistry in carbonsupported metal catalysts.
Original languageEnglish (US)
Pages (from-to)2365-2378
Number of pages14
JournalChemistry of Materials
Volume32
Issue number6
DOIs
StatePublished - Feb 19 2020

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