Issue 2, 1994

Brønsted acid strength in US-Y: FTIR study of CO adsorption

Abstract

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

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans., 1994,90, 383-386

Brønsted acid strength in US-Y: FTIR study of CO adsorption

M. A. Makarova, K. M. Al-Ghefaili and J. Dwyer, J. Chem. Soc., Faraday Trans., 1994, 90, 383 DOI: 10.1039/FT9949000383

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