Brønsted acid strength in US-Y: FTIR study of CO adsorption
作者： Marina A. Makarova , Khalid M. Al-Ghefaili , John Dwyer
DOI: 10.1039/FT9949000383
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摘要: Proton affinities of Bronsted hydroxy groups in H-forms zeolites and SAPOs are determined by an FTIR study the low-temperature adsorption carbon monoxide. This method reveals range heterogeneity associated with unmodified where only one band interacting monoxide is evident infrared spectrum. Three types acid different IR bands detected a modified zeolite (US-Y), (i) strongly acidic [3599 cm–1, proton affinity (Epa)= 1112 kJ mol–1], (ii) medium (3627 Epa= 1142 mol–1) (iii) weakly (ca. 3740 3675 1192 ± 29 mol–1).
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