Tuning the catalytic performance of Co/Mg-La system for ammonia synthesis via the active phase precursor introduction method
Hubert Ronduda , Magdalena Zybert , Wojciech Patkowski , Aleksandra Tarka , Przemysław Jodłowski , Leszek Kępiński , Adam Sarnecki , Dariusz Moszyński , Wioletta Raróg-Pilecka
A series of cobalt catalysts supported on mixed magnesium-lanthanum oxide (Co/Mg-La) was synthesized using various methods of introducing the active phase precursor on the support, i.e. deposition-precipitation (DP), deposition-precipitation using urea (DPU) and wet impregnation method (WI). The activity measurements in ammonia synthesis reaction revealed significant differences in the performance of catalysts obtained by these methods. Particularly high activity, several times higher than the activity for other catalysts, was observed for the WI catalyst. The detailed physicochemical characteristics (N2 physisorption, XRPD, TPR, H2-TPD, SEM-EDX, CO2-TPD, FTIR-DRIFT, XPS) enabled the identification of chemical state of the catalysts surface. The factors determining outstanding catalytic performance of WI catalytic system were indicated as low level of hydrogen poisoning and favorable basicity of the surface.
|Journal series||Applied Catalysis A-General, [Applied Catalysis A: General], ISSN 0926-860X, e-ISSN 1873-3875|
|Publication size in sheets||0.7|
|Keywords in English||cobalt catalyst, Mg-La mixed oxide,hydrogen poisoning,basicity,ammonia synthesis|
|Score||= 100.0, 22-07-2020, ArticleFromJournal|
|Publication indicators||= 0; : 2018 = 1.306; : 2018 = 4.63 (2) - 2018=4.586 (5)|
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