Journal of the Chemical Society, Dalton Transactions p. 881 - 886 (1988)
Update date:2022-08-11
Topics:
Ramis, Gianguido
Busca, Guido
Lorenzelli, Vincenzo
Ginestra, Aldo La
Galli, Paola
Massucci, Maria Antonietta
The layered pyrophosphates of quadrivalent Ti, Zr, Ge, and Sn have been prepared and characterized by Fourier-transform i.r. spectroscopy, differential thermal analysis, thermogravimetry, X-ray diffraction, and surface area measurements.Their surface acidity has been investigated by Fourier-transform i.r. spectroscopy, with an analysis of the OH streching region and of the spectra of adsorbed basic molecules (pyridine and acetonitrile), as well as by measuring their activity in acid-catalyzed reactions.The trend of surface Bronsted-acid strengths found was Ge>Sn>>Ti>Zr, corresponding to the trend in electronegativity of the elements, while theopposite trend was found for the surface Lewis-acid strengths.
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