Supported ruthenium nanoparticles on ordered mesoporous carbons using a cyclodextrin-assisted hard-template approach and their applications as hydrogenation catalysts
2020
Rio, Sébastien | Peru, Grégory | Léger, Bastien | Kerdi, Fatmé | Besson-Guillaumot, Michèle | Pinel, Catherine | Monflier, Eric | Ponchel, Anne
The present study is concerned with the preparation of ordered mesoporous carbons containing uniform dispersions of ruthenium nanoparticles by a hard-template method, based on the use of RuCl₃ and cyclodextrin as respective sources of metal and carbon. The influence of chemical structure of the parent CD [randomly methylated-β-CD (RAME-β-CD) and 2-hydroxypropyl-β-CD (HP-β-CD)] and loading of the ruthenium source are studied in detail. The catalysts are carefully characterized by N₂-adsorption, TEM, XRD, CO pulse chemisorption, TG-MS and H₂-TPR. The most outstanding effect is obtained when HP-β-CD is used, allowing to stabilize small and reactive Ru particles (1–2 nm) in the carbon matrix, with a good compromise between immobilization, surface availability and hydrogen spillover effect. The catalytic systems prepared from HP-β-CD display remarkably high catalytic activities in the liquid-phase hydrogenation of various substrates while their reusability and robustness are also demonstrated.
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