The DOI matches its Crossref record; 2 of the 2 references it cites were found in a registry or an index.
Three-Coordinate Aluminum in Zeolites Observed with In situ X-ray Absorption Near-Edge Spectroscopy at the Al K-Edge: Flexibility of Aluminum Coordinations in Zeolites
Open accessAbstract
Application of in situ X-ray absorption near-edge spectroscopy (XANES) at the Al K-edge provides unique insight into the flexibilty of the aluminum coordinations in zeolites as a function of treatment or during true reaction conditions. A unique, previously not observed, pre-edge feature is detected in zeolites H-Mordenite and steamed and unsteamed H-Beta at temperatures above 675 K. Spectra simulations using the full multiple scattering code Feff8 identify the unique pre-edge feature as three-coordinate aluminum. The amount of three-fold coordinated aluminum is a function of temperature and pretreatment of a zeolite: a steamed zeolite Beta contains more three-coordinate aluminum than an unsteamed sample. No clear differences between zeolites H-Mordenite and H-Beta were observed. Octahedrally coordinated aluminum forms in zeolites H-Mordenite and H-Beta at room temperature in a stream of wet helium. This octahedrally coordinated aluminum is unstable at temperatures higher than 395 K, where it quantitatively reverts to the tetrahedral coordination.
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Cites
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Metadata
- Authors
- van Bokhoven, J. A., van der Eerden, A. M. J., & Koningsberger, D. C.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2003-05-23
- Volume
- 125
- Issue
- 24
- Pages
- 7435-7442
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2025721018
- Cited by
- 209
- References
- 2
- FWCI
- 6.44
- Type
- journal article
- Language
- en
- Open access
- green
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