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Spectroscopic analysis demonstrates reliable detection of ZSM zeolite crystallites via infrared vibrational bands, indicating earlier phase identification than X-ray diffraction.
The study of i.r. lattice vibrational bands (400–1200cm–1) for different types of zeolites with different particle sizes indicates, when synthesising a ZSM-type zeolite, that (i) the presence of a band at ca. 550 cm–1 in addition to the one at 450 cm–1 shows that ZSM-type zeolite, crystallites may have been formed, even if X-ray diffraction shows nothing, and (ii) the absence of the 550cm–1 band unambiguously shows that such a zeolite has not been formed.
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Coudurier et al. (1982) studied this question.
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