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物理化学学报  2006, Vol. 22 Issue (03): 345-349    DOI: 10.3866/PKU.WHXB20060318
研究简报     
柠檬酸溶胶-凝胶法制备的纳米Ce1-xMnxO2: 织构与晶相结构
叶青; 徐柏庆
清华大学化学系, 有机光电子与分子工程教育部重点实验室, 分子催化与定向转化研究室, 北京 100084
Textural and Structure Characterizations of Ce1-xMnxO2Prepared by Citric Acid Sol-Gel Method
YE Qing; XU Bo-Qing
Innovative Catalysis Program, Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
 全文: PDF(902 KB)   输出: BibTeX | EndNote (RIS) |
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XRDRaman光谱TEM    
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.
Key words: Ce1-xMnxO2    Sol-gel preparation    N2/adsorption-desorption    XRD    Raman spectrum    TEM
收稿日期: 2005-07-12 出版日期: 2006-03-10
通讯作者: 徐柏庆     E-mail: bqxu@mail.tsinghua.edu.cn
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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(03): 345-349, 10.3866/PKU.WHXB20060318

YE Qing; XU Bo-Qing. Textural and Structure Characterizations of Ce1-xMnxO2Prepared by Citric Acid Sol-Gel Method. Acta Phys. -Chim. Sin., 2006, 22(03): 345-349, 10.3866/PKU.WHXB20060318.

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http://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB20060318        http://www.whxb.pku.edu.cn/CN/Y2006/V22/I03/345

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