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Electronic and Geometrical Structure of Zn+Ions Stabilized in the Porous Structure of Zn-Loaded Zeolite H-ZSM-5: A Multifrequency CW and Pulse EPR Study

Articolo
Data di Pubblicazione:
2017
Abstract:
Electron spin resonance and hyperfine sublevel correlation (HYSCORE) spectroscopy at X- and Q-band frequencies have been employed, in conjunction with X-ray absorption spectroscopy (XAS), to determine the geometric and electronic structure of Zn+ ions in H-ZSM-5 zeolite. Zn+ ions were generated by the direct exposure of dehydrated acid H-ZSM-S to Zn vapors. The number of Zn ions is found to increase substantially upon UV irradiation. A single EPR active species is detected, indicating a single site of adsorption, characterized by the presence of an Al3+ site, as revealed by superhyperfine interactions. The full g (g(x) = 1.9951, g(y) = 1.9984, g(z) = 2.0015) and Al-27 vertical bar Al vertical bar (A(x) = 2.8, A(y) = 2.7, A(z) = 4.6) MHz tensors were resolved, allowing for a detailed description of the geometric and electronic structure of Zn+ ions stabilized in the cages of H-ZSM-5 zeolite. The dispersion and nuclearity of Zn species formed during the sublimation/irradiation process was assessed by means of XAS spectroscopy, which indicates the absence of metal or metal oxide particles in a significant amount.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
EPR, hyperfine sublevel correlation (HYSCORE), X-RAY ABSORPTION SPECTROSCOPY, MFI-TYPE ZEOLITE, CRYSTAL-STRUCTURE, SPIN-DENSITY, IN-SITU, ZINC, CLUSTERS, REACTIVITY, FRAMEWORK
Elenco autori:
Morra, Elena; Berlier, Gloria; Borfecchia, Elisa; Bordiga, Silvia; Beato, Pablo; Chiesa, Mario*
Autori di Ateneo:
BERLIER Gloria
BORDIGA Silvia
BORFECCHIA Elisa
CHIESA Mario
Link alla scheda completa:
https://iris.unito.it/handle/2318/1651675
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1651675/377449/2017_Morra_JPhysChemC_EPR_ZnZSM5_OA.pdf
Pubblicato in:
JOURNAL OF PHYSICAL CHEMISTRY. C
Journal
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URL

http://pubs.acs.org/doi/10.1021/acs.jpcc.7b04289
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