Formation and partial self-healing of lattice defects during thermal treatments of GaZSM-5: An FTIR study using CO as a probe molecule

Literature Information

Publication Date 2001-03-08
DOI 10.1039/B008558H
Impact Factor 3.676
Authors

C. Otero Areán, B. Bonelli, G. Turnes Palomino, A. M. Canaleta Safont, E. Garrone


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Abstract

Room temperature adsorption of CO on H-GaZSM-5 occurs on both Brønsted and Lewis acid sites. On Brønsted acid sites, CO adsorption leads to an equilibrium between Z–OH···CO and Z–OH···OC species, where Z stands for the zeolite framework. Corresponding C–O stretching frequencies are 2168 and 2122 cm−1, respectively. Lewis acid sites, formed as a consequence of gallium loss during thermal treatment of the zeolite at 973 K in vacuum, appear to consist of Ga3+ and Ga+ ions; some zerovalent gallium can also be formed. Further heat treatment under oxygen seems to restore some of the gallium atoms to the zeolite framework, by a mechanism which is thought to involve the volatile gallium(I) oxide.

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Physical Chemistry Chemical Physics
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