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

References

[1] Xie K C, Zhang Y F. <patent>CN Patent, 1974732A</patent> 2007–<day>06</day>–<day>06</day> (in Chinese)

[2] Xie K C, Zhang Y F, Zhao W. The basic research of dual-gas resources multi-generation coke oven gas to syngas. Shanxi Energy and Conservation, 2008, 49: 10-12 (in Chinese)

[3] Wang J C, Zhang S Y, Bai T Z. Technical evaluation on the process of methanol syngas production based on coke oven gas. Coal Chemical Industry, 2006, 126: 48-51

[4] Li S Y, Zhou X Q. Latest progress in CO shift catalysts. Coal Chemical Industry, 2007, 129: 31-34

[5] Gorte R J, Zhao S. Studies of the water-gas-shift reaction with ceria-supported precious metals. Catalysis Today, 2005, 104(1): 18-24

[6] Yang Y Q, Fang W P. <patent>CN Patent, 1559679A</patent> 2005–<day>01</day>–<day>05</day>

[7] Ye B H, Jiang L L. Effects of CeO₂ content on structure and properties of Ni-Mn-K/Al₂O₃ multiple-metal catalysts for water-gas shift reaction. Journal of The Chinese Rare Earth Society, 2006, 24: 661-664 (in Chinese)

[8] Liu Y J, Xie Y C, Ming J. Determination of the maximum monolayer dispersion of MoO₃ on γ-Al₂O₃ by X-ray diffraction. Chinese Journal of Catalysis, 1982, 3: 262-267

[9] Wivel C, Clausen B S, Candia R S, Mørupa S, Topsøe H. Mössbauer emission studies of calcined Co-Mo/A1₂O₃ catalysts: catalytic significance of Co precursors. Journal of Catalysis, 1984, 87(2): 497-513

[10] Ou X J, Cheng J Y, Wang H M. Effects of metal oxides on stability and activity of iron-based chromia-free catalysts for water-gas shift reaction. Journal of Natural Gas Chemistry, 1999, 8: 231-237

[11] Hilaire S, Wang X, Luo T. A comparative study of water-gas-shift reaction over ceria supported metallic catalysts. Applied Catalysis A, General, 2001, 215(1-2): 271-278

[12] Arnoldy P, Franken M C, Schffer B. Temperature-programmed reduction of CoO-MoO₃/Al₂O₃ catalysts. Journal of Catalysis, 1985, 96(2): 381-395

[13] Lin R C, Yang Y Q, Yuan Y Z. The XPS and TPR characterization of sul-resisted catalyst for water gas shift promoted by K₂CO₃. Chinese Journal of Applied Chemistry, 2001, 18: 25-28

[14] Zhang X T, Li X, Sun H Y. Studies on the characterization of Co-Mo/Al₂O₃ sulfur-tolerant CO shift catalyst. Journal of Fuel Chemistry and Technology, 2003, 31: 65-69

[15] Wang H F, Lian Y X, Li Y N, Fang W, Yang Y. W-promoted Co-Mo-K/γ-Al₂O₃ catalysts for water-gas shift reaction. Catalysis Communications, 2009, 10(14): 1864-1867

[16] Kettmann V, Balgav P, Sokol L. Characterization of a novel K-Co-Mo/Al₂O₃ water gas shift catalyst: 1. Laser Raman and infrared studies of oxidic precursors. Journal of Catalysis, 1988, 112(1): 93-106

[17] Lian Y X, Wang H F, Zheng Q X, Fang W, Yang Y. Effect of Mg/Al atom ratio of support on catalytic performance of Co-Mo/MgO-Al₂O₃ catalyst for water gas shift reaction. Journal of Natural Gas Chemistry, 2009, 18(2): 161-166

[18] Kaluža L, Gulková D, Vít Z, Zdražil M. Effect of support type on the magnitude of synergism and promotion in CoMo sulphide hydrodesulphurisation catalyst. Applied Catalysis A, General, 2007, 324: 30-35

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