Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7718067 | International Journal of Hydrogen Energy | 2014 | 9 Pages |
Abstract
The effects of Co on RuO2/Al2O3's activities for water gas shift (WGS) and methanation were studied. Catalysts were characterized with BET, XRD, SEM/EDS, H2-TPR and CO-TPR. The effects of various parameters, such as calcination temperature, Ru-Co loading, Ru/Co ratio, inlet CO concentration and H2O/CO ratio on the activities of catalysts were investigated. There existed CoI (strongly interact with RuO2) and CoII (weakly interact with RuO2). For Co/RuO2/Al2O3 (Ru/Co = 1, AT = 350), only CoI existed as bimetallic Co-Ru nanoparticles. This unique structure led this catalyst to achieve the highest CO conversion of 98.6% exceeding WGS's theoretical thermodynamic equilibrium limit due to the co-occurrence of methanation. Co/RuO2/Al2O3 was more favorable to catalyze CO methanation than CO2 methanation. The apparent activation energies of forward and reverse WGS catalyzed by Co/RuO2/Al2O3 were 37.8 and 74.6 kJ molâ1, respectively. The difference was corresponding well to the enthalpy change (â41.1 kJ molâ1) of WGS.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Zhijian Mei, Ying Li, Maohong Fan, Morris D. Argyle, Jinke Tang,