Indexed on: 01 Jul '87Published on: 01 Jul '87Published in: Journal of Applied Electrochemistry
The electrochemical behaviour of Cu−Zn−Al oxide catalysts in a high-temperature solvent, dimethylsulphone (DMSO2), at 150°C has been investigated. It has been shown that CuO electroreduction becomes easier and/or deeper in the Cu−Zn−Al oxide catalysts than in CuO alone. This electroreduction occurs at higher potentials, and the overall faradic yield decreases when CO2 in dissolved in DMSO2 on account of a strong interaction between the reduced species formed during the electronic transfer and CO2. These results are consistent with the characterizations of the physical and chemical properties of these catalysts. They confirm that electrochemistry is a suitable method to determine the redox states of some copper industrial catalysts used in methanol synthesis.