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.

Keywords

coke oven gas / water gas shift reaction / sulfur-tolerant catalyst / cerium dioxide

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Acknowledgments

The authors are grateful to the National Basic Research Program of China (No. 2005CB221202) and Shanxi Provincial Natural Science Foundation (20051020) for financial support of the present study.

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg