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Pyridine Used as a Probe for Internal Bronsted Acid Sites in Pyrochlore Antimony (V) Oxide: An Infrared Spectroscopy Study

Volume 46, Number 10 (Oct. 1992) Page 1474-1476

Benvenutti, Edilson V.; Gushikem, Yoshitaka; Davanzo, Celso U.

Brønsted acid sites inside the 0.3-nm-diameter cavities of pyrochlore antimony (V) oxide were detected with the use of pyridine as a probe molecule, and following the appearance of pyridinium ions by infrared spectroscopy (8a and 19b modes). The pyridine molecule is larger than the cavities' windows and can only bind acid sites when the oxide is strongly hydrated. This observation indicates that the protons are free to migrate to the surface.