摘要
本文研究了不同配比电子型Ｎｄ－Ｃｅ－ＣＵ－Ｏ和空穴型Ｙ－Ｂａ－Ｃｕ－Ｏ系列样品的ＣＯ氧化活性、晶体结构、程序升温氧脱附和导电性的特征．结果表明：超导体ＹＢａ２Ｃｕ１．５Ｏ７－ｘ和半导体Ｃｅ２ＣｕＯｘ具有良好ＣＯ氧化转化率．后者在１２０℃时，ＣＯ达到完全转化．ＸＲＤ证明它为２ＣｅＯ２和ＣｕＯ混合晶相．由于导电和催化反应机制完全不同，活性高低和样品导电性能间没有发现直接关联．讨论了含Ｃｅ、Ｃｕ样品的活性中心，认为ＣｅＯ２为吸附氧和供氧中心，而Ｃｕｎ＋为ＣＯ活化和氧化反应中心，而前者可能为控制步骤．两者紧密协同，使Ｃｕ２＋的氧化还原循环更容易进行．
The activity of CO oxidation,crystalline structure,TPD of oxygen and conductivity are Studied on the electron-type Nd-Ce-Cu-O and vacancy-type Y-Be-CU-O Samples.The superconductor YBa2 CU1.2 O7-6 sample and semiconductor Ce2CuOx posses high CO oxidation activity.The CO full conversion is observed at 120℃ on the latter. It is considered that the CeO2 is both the adsorption oxygen centers as well as the supply oxygen center,while the Cun+ are the CO activation and CO oxidation reaction centers.Synergy effect is found between the two kinds of centers, which enables the redox cycle of Cu2+ to proceed more easily.
基金
国家自然科学基金
关键词
稀土铜酸盐
催化剂
超导体
氧化活性
rare earth-copper compounds
CO oxidation
Y-Ba-Cu oxides
Nd-Ce-Cu oxides
