Infra-red structural study of aluminium-deficient Y zeolites
- 1 January 1974
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 70, 1402-1407
- https://doi.org/10.1039/f19747001402
Abstract
The linear variations in frequency of the stretching O—(Al, Si)—O vibrations (around 1050 and 800 cm–1) with Al content of aluminium-deficient zeolites can also be extended to ultrastable zeolites. This result confirms the similarities between both types of modified zeolites. Moreover this quantitative relationship yields the number of framework Al atoms for ultrastable zeolites. A detailed study of the band intensities of aluminium-deficient zeolites in the same region was carried out. Apart from the intensity of the 730 cm–1 band which linearly decreases with decreasing Al content and is attributed to “isolated” AlO4 tetrahedra, the integrated intensities of other bands around 1150, 1050, 800, 585, 450 and 395 cm–1 are not affected by aluminium removal. This indicates that aluminium removal using ethylenediaminetetra-acetic acid does not cause structural discontinuities in the Y zeolites and it is suggested that Si atoms occupy the sites vacated by Al atoms.Keywords
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