Abstract: Ce-Y-O Solid Solution was prepared by citrate sol-gel method, and characterized by using XRD, Raman and TPR techniques. The structure of the solid solution depends on the Ce/(Ce+Y)ratio. When Ce/(Ce+Y)≥0.6, only face centered cubic phase is observed. When Ce/(Ce+Y)≤0.5, only body centered cubic phase is observed. The addition of Y atoms into CeO₂ improves the reduction-oxidation behavior. Ce-Y-O-supported PdO catalysts show higher activity for CH₄ oxidation than PdO/CeO2 and PdO/Y₂O₃ catalysts. The PdO/Ce_0.8Y _0.2O_1.90 catalyst is the most active of all catalysts.

Key words: Ce-Y-O solid solution, PdO/Ce-Y-O catalysts, TPR, CH₄ oxidation

摘要： 采用柠檬酸溶胶-凝胶法制备了Ce-Y-O固溶体，并用XRD和Raman对Ce-Y-O固溶体的物相结构进行了表征，发现当n(Ce)/n(Ce+Y)(摩尔比)≥0.6时，Ce-Y-O固溶体为面心立方结构，而n(Ce)/n(Ce+Y)≤0.5时为体心立方结构。固溶体的生成有利于提高氧化还原性能。Ce-Y-O固溶体担载PdO催化剂的CH4氧化活性表明，n(Ce)/n(Ce+Y)对担载PdO催化剂的CH₄氧化活性影响很大，当n(Ce)/n(Ce+Y)=0.8时催化剂活性最高，CH₄转化率50%的温度为350℃，完全转化温度为600℃。

关键词: Ce-Y-O固溶体, 负载PdO催化剂, TPR, CH₄氧化