Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 853 - 864 (1987)
Update date:2022-08-11
Topics:
Busca, Guido
Lorenzelli, Vincenzo
Galli, Paola
Ginestra, Aldo La
Patrono, Pasquale
The surface acidity of zirconium phosphate at different stages of dehydration and heat treatments has been studied by Fourier-transform infrared spectroscopy of adsorbed pyridine, acetonitrile and acetone and by catalytic cativity in the isomerization of but-1-ene.Broensted-acidic surface POH and P(OH)2 groups are identified <ν(OH) = 3670-3660 and 3600 cm-1, respectively> whose strenght increases slightly on bulk dehydration.They are thought to be responsible for the activity in but-1-ene isomerization, which also increases during condensation to pyrophosphate.Lewis-acidic sites of medium-high strenght have also been found, and responsible for the formation of chemisorbed forms of pyridine (ν8a = 1610 cm-1), acetonitrile <ν(CN) Fermi resonance doublet at 2322 and 2295 cm-1> and acetone <ν(CO) 1684 cm-1>.Surface ZrOH groups are also detected on the layered ZrP2O7 surface.The results illustrate the role of exposed planes, both parallel and perpendicular to the layered structure.
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