Catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas

Abstract

The catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas is investigated using X-ray diffraction (XRD) and temperature-programmed reduction (TPR). The results indicate that Ce and K have a synergistic effect on promoting the catalytic activity, and the Co-Mo-Ce-K/γ-Al2O3 catalyst with 3.0 wt-% CeO2 and 6.0 wt-% K2O exhibits the highest activity. CeO2 favors Co dispersion and mainly produces an electronic effect. TPR characterization results indicate that the addition of CeO2-K2O in the Co-Mo-Ce-K/γ-Al2O3 catalyst decreases the reduction temperature of active components, and part of octahedrally coordinated Mo6+ transforms into tetrahedrally coordinated Mo6+, which has a close relationship with the catalytic activity.