Abstract
The thermochemical reactivity of the spinel-type quaternary metal oxide Cu1−xZnxAl2O4 has been investigated for different Cu:Zn ratios. In oxygen or inert gas atmospheres no considerable reduction is observed. In molecular hydrogen metal selective reduction of the Cu is found at relatively high temperature. The solid reduction product is made up of sintered, poorly dispersed metallic copper on a Zn-Al-O metal oxide support, a potential catalyst for the methanol synthesis. Owing to the measured high reduction temperature leading to the mentioned sintering of the metallic copper, the activity of this system cannot be high.
Zusammenfassung
Für verschiedene Cu:Zn-Verhältnisse wurde die thermochemische Reaktivität des quartären Metalloxides Cu1−xZnxAl2O4 vom Spinelltyp untersucht. In Sauerstoff oder in inerten Gasen wird keine nennenswerte Reduktion beobachtet. In molekularem Wasserstoff keine bei relativ hohen Temperaturen eine selektive Metallreduktion von Cu beobachtet werden. Das feste Reaktionsprodukt besteht aus gesintertem, schwach dispersem metallischem Kupfer auf einem Zn-Al-O-Metalloxidträgermaterial: ein potentieller Katalysator für die Methanolsynthese. Wegen der gemessenen hohen Reduktionstemperaturen, die zur Sinterung des Kupfers führen, kann die Aktivität dieses Systemes nicht allzu hoch sein.
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R. Kernke, Ph. D. Thesis, University of Zürich, in progress.
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Financial support by the Swiss National Science Foundation under project Nr. 2027933.89 is gratefully acknowledged.
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Kernke, R., Hug, P., Reller, A. et al. Thermal reduction and reoxidation of spinel-type Cu1−xZnxAl2O4 . Journal of Thermal Analysis 38, 611–618 (1992). https://doi.org/10.1007/BF01979388
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DOI: https://doi.org/10.1007/BF01979388