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Oxidative Fluorination of Cu/ZnO Methanol Catalysts
Author(s) -
Dybbert Valentin,
Fehr Samuel Matthias,
Klein Florian,
Schaadt Achim,
Hoffmann Anke,
Frei Elias,
Erdem Emre,
Ludwig Thilo,
Hillebrecht Harald,
Krossing Ingo
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201811267
Subject(s) - methanol , catalysis , chemistry , fluoride , selectivity , space velocity , water gas shift reaction , inorganic chemistry , oxidative phosphorylation , nuclear chemistry , organic chemistry , biochemistry
Abstract 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 ZnO x 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 CO 2 and H 2 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.