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柠檬酸溶胶-凝胶法制备的纳米Ce1-xMnxO2: 织构与晶相结构
引用本文:叶青,徐柏庆.柠檬酸溶胶-凝胶法制备的纳米Ce1-xMnxO2: 织构与晶相结构[J].物理化学学报,2006,22(3):345-349.
作者姓名:叶青  徐柏庆
作者单位:Innovative Catalysis Program, Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
摘    要:采用N2-吸附/脱附、XRD、Raman光谱和TEM等表征技术研究了柠檬酸溶胶-凝胶法制备的Ce1-xMnxO2 (0≤x≤1) 样品的织构及晶相结构.结果表明, Ce1-xMnxO2 样品的N2吸附等温线为IV型, 滞后环为H1型, 最可几孔径处在2.5~3.7 nm范围.由XRD测得的样品晶粒大小与由TEM测定的颗粒尺寸相近, 表明制备的样品具有较好的分散性, 但是样品的组成对颗粒大小有明显的影响, Mn浓度适中样品(x=0.3~0.7)的颗粒(1~5 nm)明显小于低Mn浓度样品(x<0.3)和高Mn浓度样品(x>0.7)的颗粒(10~50 nm).尽管在x>0.7时, XRD未能检测到样品中有α-Mn2O3晶粒存在, 但Raman光谱结果表明, 所有Ce1-xMnxO2混合氧化物均以α-Mn2O3相和立方CeO2相Ce-Mn-O固溶体形式存在.

关 键 词:Ce1-xMnxO2  溶胶-凝胶法  N2-吸附/脱附  XRD  Raman光谱  TEM  
收稿时间:2005-07-12
修稿时间:2005-09-02

Textural and Structure Characterizations of Ce1-xMnxO2 Prepared by Citric Acid Sol-Gel Method
YE,Qing,XU,Bo-Qing.Textural and Structure Characterizations of Ce1-xMnxO2 Prepared by Citric Acid Sol-Gel Method[J].Acta Physico-Chimica Sinica,2006,22(3):345-349.
Authors:YE  Qing  XU  Bo-Qing
Institution:Innovative Catalysis Program, Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
Abstract:Textural and structure characterizations of Ce1-xMnxO2 (0≤x≤1) samples were studied by N2 adsorption/desorption, XRD and Raman spectroscopy. The N2 adsorption/desorption isotherms are found to be IV-type according to BDDT and their related hysteresis loops are H1 type. Pore size distribution of the Ce1-xMnxO2 samples is in the mesopores range with Rp (max) between 2.5 nm and 3.7 nm. Particle sizes of the samples with both high Mn (x>0.7) and low Mn (x<0.3) contents are larger than those with 0.3≤x≤0.7. Raman spectroscopic results show that the Ce1-xMnxO2 (x≠0, 1) samples contain mixed phases of α-Mn2O3 and Ce-Mn-O solid solution, although the presence of α-Mn2O3 phase is not detected in the XRD measurement of the samples with x≤0.7, suggesting that Raman spectroscopy is more sensitive in the structural characterization of Ce1-xMnxO2 samples.
Keywords:Ce_(1-x)Mn_xO_2  Sol-gel preparation  N2/adsorption-desorption  XRD  Raman spectrum  TEM
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