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CO偶联反应Pd/α-Al₂O₃催化剂失活的XPS研究

XPS study on the deactivated Pd/α-Al₂O₃ catalyst for CO coupling reaction with ammonia

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【Author】 WU Qin~1, GAO Zheng-hong~2, HE Fei~3, XU Gen-hui~3(1.School of Chemical Engineering, Tianjin University, Tianjin 300072, China;2.School of Science, Tianjin University, Tianjin 300072, China;300072, China)

【机构】天津大学化工学院；天津大学理学院；天津大学C1 化工国家重点实验室；天津大学C1 化工国家重点实验室天津300072；天津300072；天津 3 0 0 0 72；天津 3 0 0 0 72；

【摘要】利用失活Pd/α Al2O3催化剂的X 光电子能谱(XPS)探讨了氨气引起Pd/α Al2O3催化剂失活的原因.分析认为氨分子在活性组分Pd2+上的竞争吸附阻碍了催化剂表面上CO偶联反应及活性组分Pd的氧化还原循环,导致催化剂活性下降.更多还原

【Abstract】 The mechanism of ammonia poisoning for Pd/α-Al₂O₃ catalyst was discussed on the basis of XPS measurement results of the catalyst. It was found to be the competitive adsorption of ammonia on Pd²⁺ of catalytic surface inhibiting CO coupling reaction and the cycle of oxidation and reduction of active component —Pd on the catalyst surface. Therefore, the feed gas with ammonia causes the catalyst activity to decrease.更多还原