1.
Spectrochim Acta A Mol Biomol Spectrosc
; 58(14): 3159-66, 2002 Dec.
Artigo
em Inglês
| MEDLINE
| ID: mdl-12511100
RESUMO
With the aim to qualifying and quantifying the acidity of the Y, L and ferrierite zeolites, an infrared band analysis of pyridine adsorption and programmed temperature dessorption measurements were carried out to a set of nine samples of the Y, L and ferrierite zeolites. The infrared spectra before and after the pyridine adsorption process had revealed that the ferrierite zeolite shows, almost in the totality, Brönsted acid sites. The Y and L zeolites present, also, significative concentrations of Brönsted and Lewis acid sites. These facts allow to conclude that zeolite ferrierite is the strongest acid zeolite among these three types.