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Issue 0, 1976
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Redox behaviour of transition metal ions in zeolites. Part 3.—Auto-reduction of cupric ions in Y zeolites

Abstract

In CuY zeolites degassed at temperatures above 650 K cupric ions are reduced to some extent to cuprous ions.

Evidence for this process of auto-reduction was taken from the decrease in weight of the sample, and the detection of a desorbing gas in a volumetric system. The latter was identified as oxygen. U.v. reflectance spectroscopy showed directly the decrease of the Cu2+ species upon outgassing and their increase after oxygen adsorption. Excitation spectra showed the presence of Cu+ ions after high temperature degassing. Infrared spectroscopic techniques showed that Lewis sites are also formed upon degassing. A mechanism is proposed that accounts for the observations.

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Article type: Paper
DOI: 10.1039/F19767201221
Citation: J. Chem. Soc., Faraday Trans. 1, 1976,72, 1221-1230
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    Redox behaviour of transition metal ions in zeolites. Part 3.—Auto-reduction of cupric ions in Y zeolites

    P. A. Jacobs, W. de Wilde, R. A. Schoonheydt, J. B. Uytterhoeven and H. Beyer, J. Chem. Soc., Faraday Trans. 1, 1976, 72, 1221
    DOI: 10.1039/F19767201221

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