Controllable preparation of CeO2 nanostructure materials and their catalytic activity

Well-crystalline CeO2 nanostructures with the morphology of nanorods and nanocubes were synthesized by a template-free hydro-thermal method. X-ray diffraction （XRD）, transmission electron microscopy （TEM）, Brunauer-Emmett-Teller （BET） nitrogen adsorp-tion-desorption measurements were employed to cha...

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Published inJournal of rare earths Vol. 30; no. 7; pp. 665 - 669
Main Author 单文娟 郭红娟 刘畅 王晓楠
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2012
Subjects
Catalytic activity
catalytic properties
CeO2
Nanocomposites
Nanomaterials
Nanorods
Nanostructure
nanostructures
Oxidation
Rare earth metals
rare earths
Reduction
TPR表征
二氧化铈
催化活性
可控制备
纳米粒子
纳米结构材料
透射电子显微镜
catalytic properties
CeO2
nanostructures
rare earths
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Summary:Well-crystalline CeO2 nanostructures with the morphology of nanorods and nanocubes were synthesized by a template-free hydro-thermal method. X-ray diffraction （XRD）, transmission electron microscopy （TEM）, Brunauer-Emmett-Teller （BET） nitrogen adsorp-tion-desorption measurements were employed to characterize the synthesized materials. The reducibility and catalytic activity of nanostruc-tured CeO2 were examined by hydrogen temperature-programmed reduction （H2-TPR） and CO oxidation. The results showed that CeO2 nanorods could be converted into CeO2 nanocubes with the increasing of the reaction time and the hydrothermal temperature, CeO2 nanorods became longer gradually with the increasing of the concentrations of NaOH. H2-TPR characterization demonstrated that the intense low-temperature reduction peak in the CeO2 nanorods indicated the amount of hydrogen consumed is larger than CeO2 nanocubes. Meantime the CeO2 nanorods enhanced catalytic activity for CO oxidation, the total conversion temperature was 340 oC. The reasons were that CeO2 nanorods have much smaller crystalline sizes and higher surface areas than CeO2 nanocubes.
Bibliography:CeO2; nanostructures; catalytic properties; rare earths
Well-crystalline CeO2 nanostructures with the morphology of nanorods and nanocubes were synthesized by a template-free hydro-thermal method. X-ray diffraction （XRD）, transmission electron microscopy （TEM）, Brunauer-Emmett-Teller （BET） nitrogen adsorp-tion-desorption measurements were employed to characterize the synthesized materials. The reducibility and catalytic activity of nanostruc-tured CeO2 were examined by hydrogen temperature-programmed reduction （H2-TPR） and CO oxidation. The results showed that CeO2 nanorods could be converted into CeO2 nanocubes with the increasing of the reaction time and the hydrothermal temperature, CeO2 nanorods became longer gradually with the increasing of the concentrations of NaOH. H2-TPR characterization demonstrated that the intense low-temperature reduction peak in the CeO2 nanorods indicated the amount of hydrogen consumed is larger than CeO2 nanocubes. Meantime the CeO2 nanorods enhanced catalytic activity for CO oxidation, the total conversion temperature was 340 oC. The reasons were that CeO2 nanorods have much smaller crystalline sizes and higher surface areas than CeO2 nanocubes.
11-2788/TF
Shan Wenjuan , Guo Hongjuan , Liu Chang , Wang Xiaonan （Institute of Chemistry for Functionalized Materials, College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China）
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60109-4