Issue 7, 1994
From the journal:

Journal of the Chemical Society, Faraday Transactions

Brønsted acid sites in zeolites. FTIR study of molecular hydrogen as a probe for acidity testing

Marina A. Makarova,   Vladimir L. Zholobenko,   Khalid M. Al-Ghefaili,   Nicholas E. Thompson,   John Dewing  and  John Dwyer  

Abstract

Hydrogen is used as a probe molecule for characterisation of Brønsted acidity in zeolites. Hydrogen adsorption is monitored volumetrically (physisorption of hydrogen) and by FTIR (OH⋯H2 complex formation), simultaneously. The physisorption of hydrogen is a function of the pore size of a zeolite whereas the OH⋯H2 interaction reflects the strength of the acid sites. Hydrogen complexes observed by FTIR are characterised by four parameters which depend upon acid strength: shifts in the position and the increase in absorbance of the hydroxy and the H2 bands. For the zeolites studied the behaviour of these parameters is consistent and shows the following order of acidity: SAPO-37 <H-Y <H-EMT <H-ZSM-5 <H-MOR. Hydrogen is also compared with carbon monoxide, another probe widely used for acidity determination.

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Article information

DOI
https://doi.org/10.1039/FT9949001047
Article type
Paper

J. Chem. Soc., Faraday Trans., 1994,90, 1047-1054

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Brønsted acid sites in zeolites. FTIR study of molecular hydrogen as a probe for acidity testing

M. A. Makarova, V. L. Zholobenko, K. M. Al-Ghefaili, N. E. Thompson, J. Dewing and J. Dwyer, J. Chem. Soc., Faraday Trans., 1994, 90, 1047 DOI: 10.1039/FT9949001047

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