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Nature and Topology of Metal–Oxygen Binding Sites in Zeolite Materials: 17 O High‐Resolution EPR Spectroscopy of Metal‐Loaded ZSM‐5
Author(s) -
Morra Elena,
Signorile Matteo,
Salvadori Enrico,
Bordiga Silvia,
Giamello Elio,
Chiesa Mario
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201906488
Subject(s) - zeolite , electron paramagnetic resonance , metal , oxygen , catalysis , spectroscopy , topology (electrical circuits) , chemistry , chemical physics , zsm 5 , materials science , inorganic chemistry , physics , nuclear magnetic resonance , organic chemistry , mathematics , quantum mechanics , combinatorics
Determining structural models is pivotal to the rational understanding and development of heterogeneous catalytic systems. A paradigmatic case is represented by open‐shell metals supported on oxides, where the catalytic properties crucially depend on the nature of the metal–oxygen bonds and the extent of charge and spin transfer. Through a combination of selective 17 O isotopic enrichment and the unique properties of open‐shell s‐state monovalent Group 12 cations, we derive a site‐specific topological description of active sites in an MFI zeolite. We show that just a few selected sites out of all possible are populated and that the relative occupancies depend on the specific properties of the metal, and we provide maps of charge and spin transfer at the metal–oxygen interface. This approach is not restricted to zeotype materials, rather it is applicable to any catalysts supported on oxygen‐containing materials.