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Evolution of zincian malachite synthesis by low temperature co-precipitation and its catalytic impact on the methanol synthesis

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Teschner,  Detre
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Machoke,  Albert Gonche Fortunatus
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Schlögl,  Robert
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Zwiener, L., Girgsdies, F., Brennecke, D., Teschner, D., Machoke, A. G. F., Schlögl, R., et al. (2019). Evolution of zincian malachite synthesis by low temperature co-precipitation and its catalytic impact on the methanol synthesis. Applied Catalysis B: Environmental, 249, 218-226. doi:10.1016/j.apcatb.2019.02.023.


Cite as: https://hdl.handle.net/21.11116/0000-0006-79E3-2
Abstract
Low temperature co-precipitation enabled, for the first time, the preparation of phase pure zincian malachite precursors with Zn contents of up to 31 at.-%. The high Zn content was beneficial for maximizing the dispersion of Cu and oxygen defect sites on the ZnO surface. Further, an increase of the Zn loading from 10 to 31 at.-% doubled the specific surface areas obtained from N2O-RFC (Reactive Frontal Chromatography) and H-2-TA (Transient Adsorption). As the Zn content was increased from 10 to 31 at.-%, the apparent activation energy for methanol formation was strongly decreased. Furthermore, water formation was reduced indicating a retardation of the rWGS in favor of methanol formation at high Zn loadings. Additionally, compared to high temperature co-precipitation, low temperature precipitated catalysts exhibited increased catalytic activities.