Datensatz

Zusammenfassung

The influence of a mild difluorine treatmenton 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 CO₂ and H₂ was almost unchanged, the E_{A, app} for the rWGS reaction increased considerably. Overall, fluorination led to a significant gain in methanol selectivity and productivity. Apparently, also the quantity of active sites increased.