焙烧与预处理条件对Co3O4催化氧化CO性能的影响

采用沉淀法制备了Co3O4,考察了焙烧和预处理条件对其结构、低温催化氧化CO性能的影响.热重分析表明,未经焙烧的样品以Co(OH)2CO3的形式存在,150~400oC空气气氛中焙烧后,样品以立方相Co3O4的形式存在.N2吸附-脱附法、X射线衍射、透射电镜及活性测试结果表明,以纳米颗粒物存在的Co3O4的比表面积、颗粒尺寸、催化氧化CO活性与焙烧温度密切相关.正电子湮没寿命谱、O2-程序升温脱附与定温条件下CO氧化测试结果表明,合适温度(150~250oC)下N2预处理有利于Co3O4表面氧空穴团的形成,它在吸附活化分子氧以及CO催化氧化反应中起到关键作用.同时讨论了预处理作用下Co3O4表...

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Bibliographic Details
Published in催化学报 Vol. 34; no. 2; pp. 283 - 293
Main Author 余运波 赵娇娇 韩雪 张燕 秦秀波 王宝义
Format Journal Article
LanguageChinese
Published 中国科学院生态环境研究中心,北京,100085%中国科学院高能物理研究所核分析技术重点实验室,北京,100049 2013
Subjects
一氧化碳氧化
四氧化三钴
氧空穴
焙烧
预处理
焙烧
预处理
Tricobalt tetraoxide
Carbon monoxide oxidation
氧空穴
一氧化碳氧化
Calcination
四氧化三钴
Pretreatment
Oxygen vacancy
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ISSN0253-9837
1872-2067
DOI10.1016/S1872-2067(11)60484-1

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Summary:采用沉淀法制备了Co3O4,考察了焙烧和预处理条件对其结构、低温催化氧化CO性能的影响.热重分析表明,未经焙烧的样品以Co(OH)2CO3的形式存在,150~400oC空气气氛中焙烧后,样品以立方相Co3O4的形式存在.N2吸附-脱附法、X射线衍射、透射电镜及活性测试结果表明,以纳米颗粒物存在的Co3O4的比表面积、颗粒尺寸、催化氧化CO活性与焙烧温度密切相关.正电子湮没寿命谱、O2-程序升温脱附与定温条件下CO氧化测试结果表明,合适温度(150~250oC)下N2预处理有利于Co3O4表面氧空穴团的形成,它在吸附活化分子氧以及CO催化氧化反应中起到关键作用.同时讨论了预处理作用下Co3O4表面氧空穴的再构机制.
Bibliography:YU Yunboa,*,ZHAO Jiaojiaoa, HAN Xuea, ZHANG Yana, QIN Xiubob, WANG Baoyib a Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences, Beijing100085, China b Institute of High Energy Physics, Chinese Academy of Sciences,Beijing100049, China
The influence of calcination and pretreatment conditions on the structure of Co3O4 and its activity for CO oxidation were studied.TG analysis indicated that the precursor of Co3O4 prepared by a precipitation method was present in the form of cobalt hydroxide carbonate,calcination of which within the temperature range of 150-400 oC in air resulted in the formation of cubic phase Co3O4.N2 adsorption-desorption,powder X-ray diffraction,transmission electron microscopy,and activity test results showed that the prepared Co3O4 samples were comprised of nanoparticles, with the specific surface area and size distribution closely related to the calcination temperature. Over these samples,a size dependence of the catalytic activity for CO oxidation was clearly observ
ISSN:0253-9837
1872-2067
DOI:10.1016/S1872-2067(11)60484-1