Abstract
The oxidation state of copper in Cu 2+ -Y and Cu 2+ -ZSM-5 after irradiation by X-rays during ESCA measurement is investigated. The Cu 2+ Cu 1+ reduction resulting from water decomposition is verified by Auger parameter analysis. The limiting step in this reaction, which can occur at ambient temperature, is the desorption of the O 2 and H 2 O produced.
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