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International Journal of SpectroscopyVolume20132013, Article ID961404, 7 pages

Research Article

Department of Chemical Engineering, Kansas State University, 1005 Durland Hall, Manhattan, KS 66506-5102, USA

Burns & McDonnell, 9400 Ward Parkway, Kansas City, MO 64114, USA

Received 26 June 2013; Accepted 9 September 2013

Academic Editor: AkihideWada

Copyright 2013 Sean R. Tomlinson et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Infrared spectroscopy is known to be a useful tool for identifying local structure changes in zeolites. Infrared spectroscopy is often employed to complement X-ray diffraction data. Local structure changes in zeolite CIT-6 and its zeolite beta *BEA analogs caused by calcination, altering framework composition, and ion exchange have been identified with mid- and far-infrared spectroscopy. Differences in the local structures of the samples were observed in mid- and far-infrared spectra, including changes in the intratetrahedral asymmetric stretch, the double-ring mode, and the intratetrahedral bending mode regions. The infrared spectra indicate that calcination or acetic acid extraction changed the structure of CIT-6 to that of zeolite beta *BEA. Zinc ion exchange or the substitution of aluminum into the framework structure of acetic acid extracted samples retained the CIT-6 structure.





Autor: Sean R. Tomlinson,Tyler McGown,John R. Schlup,and Jennifer L. Anthony

Fuente: https://www.hindawi.com/



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