Functionalised metal-organic frameworks
A novel approach to stabilising single metal atoms
P. Szilágyi (TU Delft - ChemE/Materials for Energy Conversion and Storage)
D. M. Rogers (The University of Edinburgh)
I. Zaiser (Max Planck Institute for Intelligent Systems)
E Callini (Swiss Federal Laboratories for Materials Science and Technology (Empa), École Polytechnique Fédérale de Lausanne)
Stuart Turner (Universiteit Antwerpen)
A Borgschulte (Swiss Federal Laboratories for Materials Science and Technology (Empa))
A. Züttel (TU Delft - ChemE/Materials for Energy Conversion and Storage)
H. Geerlings (TU Delft - ChemE/Materials for Energy Conversion and Storage)
M Hirscher (Max Planck Institute for Intelligent Systems)
B. Dam (TU Delft - ChemE/Materials for Energy Conversion and Storage)
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Abstract
We have investigated the potential of metal-organic frameworks for immobilising single atoms of transition metals using a model system of Pd supported on NH2-MIL-101(Cr). Our transmission electron microscopy and in situ Raman spectroscopy results give evidence for the first time that functionalised metal-organic frameworks may support, isolate and stabilise single atoms of palladium. Using thermal desorption spectroscopy we were able to evaluate the proportion of single Pd atoms. Furthermore, in a combined theoretical-experimental approach, we show that the H-H bonds in a H2 molecule elongate by over 15% through the formation of a complex with single atoms of Pd. Such deformation would affect any hydrogenation reaction and thus the single atoms supported on metal-organic frameworks may become promising single atom catalysts in future.