前驱体CeOHCO3的结构对CeO2催化性能的影响(英文)

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	前驱体CeOHCO3的结构对CeO2催化性能的影响(英文)
	Sun MJ(孙明娟)1,2 ; Zou GJ(邹国军)1 ; Xu S(许珊)1 ; Wang XL(王晓来)1
刊名	催化学报
	2012
卷号	33 期号:8 页码:1318-1325
关键词	hexagonal 六方相 cerium hydroxide carbonate cerium oxide rod-like methane oxidation 碱式碳酸铈氧化铈棒状结构甲烷燃烧
ISSN号	0253-9837
通讯作者	王晓来
中文摘要	以尿素替代水为溶剂, 采用改良的尿素水解法制备不同结构的CeOHCO₃和CeO₂, 并运用N₂吸附-脱附、X射线衍射、H₂程序升温还原、O₂程序升温脱附、X射线光电子能谱、扫描电镜及甲烷燃烧反应对CeO₂催化剂进行表征和催化性能测试. 结果表明, CeO₂催化性能和前驱体CeOHCO₃的晶相结构(六方相或八面体相)存在直接关系.与以八面体为前驱体制得的颗粒状CeO₂相比, 以六方相为前驱体制得的棒状CeO₂具有比表面积大、氧化还原能力强、表面氧空缺浓度高以及催化甲烷燃烧活性高的特点.
英文摘要	A modified hydrothermal process method based on using urea instead of water as the solvent was used to prepare CeOHCO₃. Pure CeOHCO₃ with a single crystalline structure was produced by varying the experimental conditions. CeO₂ particles obtained from these CeOHCO₃ precursors were tested for CH₄ oxidation. The temperatures for 90% methane conversion were 604 and 647°C for CeO₂ catalysts obtained from hexagonal and orthorhombic CeOHCO₃, respectively, indicating that the CeO₂ catalyst from hexagonal CeOHCO₃ (CeO₂-A) was more active than that from the orthorhombic form (CeO₂-D). The specific surface area and pore volume of CeO₂-A were 45 m²/g and 0.35 cm³/g, respectively, which were higher than those of CeO₂-D. H₂-TPR showed a much lower reduction temperature and enhanced reducibility with CeO₂-A. XPS and O₂-TPD results demonstrated there were more oxygen vacancies on the surface of CeO₂-A than on CeO₂-D, which implied increased oxygen mobility. The CeOHCO₃-structure dependent activity was investigated and found to originate from the morphologies of the CeOHCO₃ precursors. Hexagonal CeOHCO₃ had a rod-like shape while orthorhombic CeOHCO₃ had a sphere-like morphology. After calcination, the obtained CeO₂ had the morphology of the precursor. The difference in morphology gave CeO₂ catalysts with different texture, structure, reducibility, and thus catalytic activity.
学科主题	物理化学与绿色催化
收录类别	SCI
语种	英语
WOS记录号	WOS:000307624400011
公开日期	2013-10-11
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/3905]
专题	兰州化学物理研究所_OSSO国家重点实验室
作者单位	1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Gansu, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Sun MJ(孙明娟),Zou GJ(邹国军),Xu S(许珊),等. 前驱体CeOHCO3的结构对CeO2催化性能的影响(英文)[J]. 催化学报,2012,33(8):1318-1325.
APA	Sun MJ,Zou GJ,Xu S,&Wang XL.(2012).前驱体CeOHCO3的结构对CeO2催化性能的影响(英文).催化学报,33(8),1318-1325.
MLA	Sun MJ,et al."前驱体CeOHCO3的结构对CeO2催化性能的影响(英文)".催化学报 33.8(2012):1318-1325.