Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 99 - 110 (1984)
Update date:2022-08-23
Topics:
Ghosh, Ashim K.
Curthoys, Geoffrey
Characterization of the acidity of an HY and a number of mordenite zeolites (SiO2/Al2O3 ratios 8-26) has been studied by infrared spectroscopy using ammonia, methylamine and n-butylamine.The characteristic bands of adsorbed ammonia appeared at 1445 cm-1 (Bronsted type) and 1623 cm-1 (Lewis type), with the disappearance of the acidic OH band at 3609 cm-1 for mordenites and of the acidic OH bands at 3643 and 3568 cm-1 for HY.When methylamine and n-butylamine were adsorbed on the catalysts the acidic hydroxyls were found to be accessible to the amines and a band of δsym(NH3(1+))(RNH2 adsorbed on a Bronsted site) appeared in the 1500-1540 cm-1 region with a band at ca. 1610 cm-1, which is a combination of RNH2 on Lewis sites and δasym(NH3(1+)).Bronsted acidity of the catalysts as determined from the band intensities of the adsorbed ammonia, methylamine and n-butylamine, although not in numerical agreement, showed the same trend.The alkylamines were decomposed into alkenes at elevated temperatures and the decomposition was prominent in the case of n-butylamine.
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