Oxidative fluorination of Cu/ZnO methanol catalysts
Dybbert, Valentin and Fehr, Samuel Matthias and Klein, Florian and Schaadt , Achim and Hoffmann, Anke and Frei, Elias and Erdem, Emre and Ludwig, Thilo and Hillebrecht, Harald and Krossing, Ingo (2019) Oxidative fluorination of Cu/ZnO methanol catalysts. Angewandte Chemie (International Edition) . ISSN 1433-7851 (Print) 1521-3773 (Online) Published Online First http://dx.doi.org/10.1002/anie.201811267
Official URL: http://dx.doi.org/10.1002/anie.201811267
The influence of a mild difluorine treatment on Cu/ZnO precatalysts for methanol synthesis was investigated. It led to the incorporation of 1.2…1.3±0.1 wt % fluoride into the material. Fluorination considerably increased the amount of ZnOx related defect sites on the catalysts and significantly increased the space‐time yields. Although the apparent activation energy E(A,app) for methanol formation from CO2 and H2 was almost unchanged, the E(A,app) for the reverse water‐gas shift (rWGS) reaction increased considerably. Overall, fluorination led to a significant gain in methanol selectivity and productivity. Apparently, also the quantity of active sites increased.
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