Effect of doping rare earth oxide on performance of copper-manganese catalysts for water-gas shift reaction

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• 作者：Runxia HE (()) ; Haoqiang JIANG (()) ; Fang WU (()) ; Keduan ZHI (()) ; Na WANG (()) ; Chenliang ZHOU (()) ; Quansheng LIU (()) ; ^{liuqs@imut.edu.cn" class="auth_mail}
• 关键词：rare earth oxide ; copper-manganese catalyst ; water-gas shift reaction ; stability
• 刊名：Journal of Rare Earths
• 出版年：April 2014
• 年：2014
• 卷：32
• 期：4
• 页码：298-305
• 全文大小：1155 K

文摘

Rare earth-doped copper-manganese mixed oxide catalysts were prepared by coprecipitation and mechanical mixing using copper sulfate, manganese sulfate, and rare-earth oxides REO (REO indicates La₂O₃, CeO₂, Y₂O₃, or Pr₆O₁₁) as raw materials. The samples were characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), temperature-programmed reduction of oxidized surfaces (s-TPR), and temperature-programmed desorption (TPD). Catalytic activities were tested for a water-gas shift reaction. Doping rare earth oxides did not alter the crystal structure of the original copper-manganese mixed oxides but changed the interplanar spacing, adsorption performance and reaction performance. Doping with La₂O₃ enhanced the activity and stability of Cu-Mn mixed oxides because of high copper distribution and fine reduction. Doping with CeO₂ and Y₂O₃ also decreased the reduction temperatures of the samples to different degrees while improving the dispersion of Cu on the surface, thus, catalytic activity was better than that of undoped Cu-Mn sample. The Pr₆O₁₁-doped sample was difficult to reduce, the dispersion of surface coppers was lowered, resulting in poor activity.