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Citation: LIN Ren-Cun, YANG Yi-Quan, YUAN You-Zhu, WEI Guang, WANG Qi, FAN Jin-Hong, DAI Shen-Jun. The XPS and TPR Characterization of Sulfur-resisted Catalysts for Water Gas Shift Promoted by K₂CO₃[J]. Chinese Journal of Applied Chemistry, ;2001, 18(1): 25-28. shu

The XPS and TPR Characterization of Sulfur-resisted Catalysts for Water Gas Shift Promoted by K₂CO₃

1.
Department of Chemistry, Institute of Physical Chemistry, State Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005

Received Date: 23 March 2000
Available Online: 3 August 2000
Fund Project: 厦门大学基金项目(1999~2001,K01005) (1999~2001,K01005)

The XPS, TPR techniques were used to study the promotion effect of K₂CO₃ to the supported catalyst Co-Mo-K-O/V-Al₂O₃ for water gas shift. The XPS results show that the amount of low valence molybdenum and S^2- increases with increase of the content of K in sulfured catalyst, and (S-S)^2- is suppressed. It is found that keeping the ratio (Mo⁴⁺+Mo⁵⁺)/Mo⁶⁺ at 0.8~1 level and remaining more S^2- species on the catalyst are in favor of the improvement of the catalytic activity at low temperature. Two hydrogen adsorped peaks of TPR, namely T and U peaks, which can be ascribed to Mo⁶⁺→Mo⁵⁺ and Mo⁵⁺→Moⁿ⁺(n=4,3,2) reduction processes respectively, appear both at sulfured state and functioning state. The experiment results indicate that there is a close relation between the altitude of the peaks and the activity of the catalyst at low temperature.
- Co Mo/Al₂O₃ catalyst,
- K₂CO₃ promoter,
- water gas shift
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The XPS and TPR Characterization of Sulfur-resisted Catalysts for Water Gas Shift Promoted by K2CO3

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通讯作者: 陈斌, bchen63@163.com

The XPS and TPR Characterization of Sulfur-resisted Catalysts for Water Gas Shift Promoted by K₂CO₃