Reverse water–gas shift reaction over co-precipitated Co–CeO2 catalysts: Effect of Co content on selectivity and carbon formation

• DOI: 10.1016/j.ijhydene.2016.07.048
• Publication Date: 2016-07-28T03:25:24Z
• Authors: Luhui Wang; Hui Liu; Ying Chen; Shuqing Yang
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Abstract The Co–CeO 2 catalysts with different cobalt contents were prepared via co-precipitation method and used for reverse water–gas shift (RWGS: CO 2 + H 2 → CO + H 2 O) reaction. Characterizations of the catalysts were conducted by XRD, TPR, TPO, TEM and SEM. The results show that highly dispersed Co 3 O 4 interacted with CeO 2 is formed in 2% Co–CeO 2 catalyst, and the catalyst shows excellent RWGS catalytic performance in terms of activity, selectivity and low carbon deposition. However, in the catalysts with high Co loading amount (≥5%), bulk Co 3 O 4 with larger particle size is formed, which leads to obviously increased carbon deposition and by-product CH 4 production during the reaction. These results suggest that highly dispersed Co, reduced from highly dispersed Co 3 O 4 on CeO 2 , should be the key active component for RWGS reaction; while bulk Co with large particle size should be the key active component for methanation and carbon deposition.