Bimetallic FexPt100–x Nanoparticles Immobilized on Supported Ionic Liquid Phases as Hydrogenation and Hydrodeoxygenation Catalysts: Influence of the Metal Content on Activity and Selectivity

ACS Applied Nano Materials, vol. 6, pp. 20231–20239

Abstract

Iron–platinum nanoparticles of tunable Fe/Pt ratios were immobilized on an imidazolium-based supported ionic liquid phase (SILP). The resulting Fe x Pt 100– x @SILP materials were characterized and applied in catalysis. Electron microscopy confirmed the formation of small, well-dispersed, bimetallic nanoparticles in all the investigated materials. Magnetometry measurements evidenced a clear influence of the Fe/Pt ratio on the oxidation state of Fe in Fe x Pt 100– x @SILP. In particular, Fe appeared in the metallic state at x ≤ 40, whereas partial oxidation was observed at x ≥ 60. The catalytic properties of Fe x Pt 100– x @SILP materials were probed using the reduction of benzylic ketones with H 2 as a model reaction. The Fe/Pt ratio of the nanoparticles was found to have a critical influence on the observed activity and selectivity, with clear synergistic effects. In particular, by diluting Pt with Fe sites, the ability of Fe x Pt 100– x @SILP catalysts to hydrogenate 6-membered aromatic rings was shut down for x ≥ 40, while C═O hydrogenation activity was preserved. In addition, Fe 40 Pt 60 @SILP showed excellent hydrodeoxygenation activity and selectivity with acetophenone derivatives in the absence of acid additives. This remarkable reactivity, out of reach for monometallic Pt@SILP, is attributed to the enhanced oxophilicity of Fe in FePt catalysts favoring C═O activation and cleavage.

Authors 5

1. Lise‐Marie Lacroix

   Centre National de la Recherche Scientifique · Université de Toulouse · Institut Universitaire de France · Institut National des Sciences Appliquées de Toulouse · Laboratoire de Physique et Chimie des Nano-Objets

   Affiliation as printed

   Institut Universitaire de France (IUF), 103 Boulevard Saint Michel, 75005 Paris, France

   LPCNO, INSA, CNRS, Université de Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France

2. Nicolas Ratel‐Ramond

   Centre National de la Recherche Scientifique · Université de Toulouse · Institut National des Sciences Appliquées de Toulouse · Laboratoire de Physique et Chimie des Nano-Objets

   Affiliation as printed

   LPCNO, INSA, CNRS, Université de Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France

3. Walter Leitner Aachen Institut für Technische und Makromolekulare Chemie

   RWTH Aachen University · Max Planck Institute for Chemical Energy Conversion

   Affiliation as printed

   Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany

   Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany

4. Alexis Bordet corresponding

   Max Planck Institute for Chemical Energy Conversion

   Affiliation as printed

   Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany

5. Simon Tricard corresponding

   Centre National de la Recherche Scientifique · Université de Toulouse · Institut National des Sciences Appliquées de Toulouse · Laboratoire de Physique et Chimie des Nano-Objets

   Affiliation as printed

   LPCNO, INSA, CNRS, Université de Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France