Rayalu, , S S and Udhoji, J S and Meshram, S U and Naidu, R R and Devotta, S (2005) Estimation of crystallinity in flyash-based zeolite-A using XRD and IR spectroscopy. Current Science, 89 (12). pp. 2147-2151.

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Various processes have been developed for synthesis of zeolite-A from flyash (FAZ-A), which have been patented nationally and internationally. The processes developed include five different methodologies with variations in pretreatment steps, sodium aluminate addition, etc. as a function of structure development and exchange capacity. Infrared (IR) spectroscopy has been used to study the framework structure of zeolites and also estimate their crystallinity. A systematic investigation of the framework structures have been carried out in the range of 400–4000 cm–1. Investigations were based on the assignment of IR band to certain structural groups in the various zeolitic framework structures. The per cent crystallinity of FAZ-A samples has been ascertained by comparing the ratio of intensity of the peak at 560 and 480 cm–1 with the corresponding ratio for a standard sample. The per cent crystallinity of FAZ-A is calculated using standard procedure. Results of crystallinity obtained by IR and X-ray diffraction (XRD) methods are comparable and range between 85 and 100%. Investigation using IR is found to be good for estimating crystallinity and structure elucidation and is complementary to XRD.

Item Type: Article
Subjects: Materials Science
Depositing User: Users 8 not found.
Date Deposited: 26 Mar 2012 11:33
Last Modified: 26 Mar 2012 11:34
URI: http://neeri.csircentral.net/id/eprint/164

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