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Pyridine adsorption reveals high-coordinated cationic centres at the surface of microcrystalline ZnO

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Abstract

The adsorption of pyridine at 300 K on microcrystalline ZnO has been investigated by FTIR spectroscopy. Besides an interaction by H-bonding with surface OH groups, evidence is found for the Lewis coordination of pyridine onto coordinatively unsaturated surface Zn2+ centres possessing a regular tetrahedral coordination, as well as onto some other surface Zn2+ centres, only slightly uncoordinated. The creation at the surface of the ZnO of cationic centres with an anomalous coordination higher than 4 (quasi-octahedral) is thus postulated. No such high-coordinated Zn2+ centres seem to form to an appreciable extent when ZnO is dispersed (at least at up to a 3% weight level) at the surface of other microcrystalline oxides such as, for instance, TiO2.

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Authors and Affiliations

  1. Dipartimento di Chimica Inorganica, Chimica Fisica e Chimica dei Materiali, Università di Torino, via P. Giuria 7, I-10125, Torino, Italy

    Claudio Morterra & Giuseppina Cerrato

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  1. Claudio Morterra
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  2. Giuseppina Cerrato
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Morterra, C., Cerrato, G. Pyridine adsorption reveals high-coordinated cationic centres at the surface of microcrystalline ZnO. Catal Lett 10, 357–363 (1991). https://doi.org/10.1007/BF00769170

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  • DOI: https://doi.org/10.1007/BF00769170

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