Direct assessment of confinement effect in zeolite-encapsulated subnanometric metal species

Lichen Liu (), Miguel Lopez-Haro, Jose Antonio Perez-Omil, Mercedes Boronat, Jose J. Calvino and Avelino Corma ()
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Lichen Liu: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n
Miguel Lopez-Haro: Universidad de Cádiz
Jose Antonio Perez-Omil: Universidad de Cádiz
Mercedes Boronat: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n
Jose J. Calvino: Universidad de Cádiz
Avelino Corma: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Subnanometric metal species confined inside the microporous channels/cavities of zeolites have been demonstrated as stable and efficient catalysts. The confinement interaction between the metal species and zeolite framework has been proposed to play the key role for stabilization, though the confinement interaction is elusive to be identified and measured. By combining theoretical calculations, imaging simulation and experimental measurements based on the scanning transmission electron microscopy-integrated differential phase contrast imaging technique, we have studied the location and coordination environment of isolated iridium atoms and clusters confined in zeolite. The image analysis results indicate that the local strain is intimately related to the strength of metal-zeolite interaction and a good correlation is found between the zeolite deformation energy, the charge state of the iridium species and the local absolute strain. The direct observation of confinement with subnanometric metal species encapsulated in zeolites provides insights to understand their structural features and catalytic consequences.

Date: 2022
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DOI: 10.1038/s41467-022-28356-y

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