Investigation of the Coordination State of Aluminum in β Zeolites by X-ray Photoelectron Spectroscopy

β zeolites have been characterized by X-ray photoelectron spectroscopy (XPS). Owing to the small crystallite size (20 nm), nearly 90% of the Si and Al content can be estimated from the Si 2p and Al 2p peaks. The chemical state of Al was established by decomposition of the Al KLL Auger transition. Th...

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Published in:The journal of physical chemistry. B 2001-07, Vol.105 (29), p.6812-6816
Main Authors: Collignon, F, Jacobs, P. A, Grobet, P, Poncelet, G
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Language:English
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container_title The journal of physical chemistry. B
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creator Collignon, F
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Grobet, P
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description β zeolites have been characterized by X-ray photoelectron spectroscopy (XPS). Owing to the small crystallite size (20 nm), nearly 90% of the Si and Al content can be estimated from the Si 2p and Al 2p peaks. The chemical state of Al was established by decomposition of the Al KLL Auger transition. Three types of Al could be differentiated:  tetrahedral (AlIV), octahedral (AlVI), and tricoordinated (AlIII). From the decomposition of the Al KLL peak of a β zeolite calcined to remove its template, it was found that AlIV transforms to AlIII and AlVI. Reversibility of AlIII to AlIV also occurred when the sample was ammonium-exchanged, confirming 27Al MAS NMR results.
doi_str_mv 10.1021/jp0106202
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title Investigation of the Coordination State of Aluminum in β Zeolites by X-ray Photoelectron Spectroscopy
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