北京大学学报（自然科学版）

Ce-Y-O固溶体及其PdO/Ce-Y-O催化剂的制备，表征和CH4氧化性能

罗孟飞,单文娟,李美俊,鲁继青,李灿   

  1. 中国科学院大连化学物理研究所，催化基础国家重点实验室，大连，116023
  • 收稿日期:2000-07-06 出版日期:2001-03-20 发布日期:2001-03-20

Characterization and Preparation of Ce-Y-O Solid Solutions and PdO/Ce-Y-O Catalysts for CH4 Oxidation

LUO Mengfei，SHAN Wenjuan，LI Meijun，LU Jiqing，LI Can   

  1. State Key Laboratory of Catalysis, Dilian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023
  • Received:2000-07-06 Online:2001-03-20 Published:2001-03-20

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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

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/Ce0.8Y 0.2O1.90 catalyst is the most active of all catalysts.

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

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