Bimetallic Ce/Zr-UiO-66 metal–organic frameworks (MOFs) proved to be promising materials for various catalytic redox applications, representing, together with other bimetallic MOFs, a new generation of porous structures. However, no direct proof for the presence of both metals in a single cornerstone of UiO-type MOFs was reported so far. Employing element-selective X-ray absorption spectroscopy techniques herein, we demonstrate, for the first time, that our synthesis route allows obtaining Ce/Zr-UiO-66 MOFs with desired Ce content and bimetallic CeZr5 cornerstones. Performing multiple-edge extended X-ray absorption fine structure analysis, we determine the exact stoichiometry of the cornerstones, which explains the dependence of thermal and chemical stability of the materials on Ce content.

Exact Stoichiometry of CexZr6–x Cornerstones in Mixed-Metal UiO-66 Metal–Organic Frameworks Revealed by Extended X-ray Absorption Fine Structure Spectroscopy

Atzori C.;Bonino F.;Bordiga S.;Lamberti C.
2018-01-01

Abstract

Bimetallic Ce/Zr-UiO-66 metal–organic frameworks (MOFs) proved to be promising materials for various catalytic redox applications, representing, together with other bimetallic MOFs, a new generation of porous structures. However, no direct proof for the presence of both metals in a single cornerstone of UiO-type MOFs was reported so far. Employing element-selective X-ray absorption spectroscopy techniques herein, we demonstrate, for the first time, that our synthesis route allows obtaining Ce/Zr-UiO-66 MOFs with desired Ce content and bimetallic CeZr5 cornerstones. Performing multiple-edge extended X-ray absorption fine structure analysis, we determine the exact stoichiometry of the cornerstones, which explains the dependence of thermal and chemical stability of the materials on Ce content.
2018
140
50
17379
17383
https://pubs.acs.org/doi/10.1021/jacs.8b10343
MOF, Cerium, XAS, mixed-metal
Lomachenko, K.A., Jacobsen, J., Bugaev, A.L., Atzori, C., Bonino, F., Bordiga, S., Stock, N., Lamberti, C.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1692940
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