A spectroscopic study of the nature and accessibility of protonic and cationic sites in H- and partially exchanged Cu- and Co-MFI zeolites.

Autor: T. Montanari, M. Bevilacqua, C. Resini, G. Busca, R. Pirone, G. Ruoppolo
Zdroj: Journal of Porous Materials; Sep2007, Vol. 14 Issue 3, p291-297, 7p
Abstrakt: Abstract  A study of the nature and accessibility of internal and external protonic and cationic sites has been carried out on protonic and partially Co- or Cu-exchanged ZSM5zeolite samples through UV-Vis and FT-IR spectroscopies. The samples were prepared by ionic exchange. o-toluonitrile has been chosen as a probe for the external surface of the zeolites. The existence of Cu2+ and Co2+ sites at positions different from those exchanging the active protons of the zeolites is emphasized. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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