Co3O4/CeO2的氧化还原性能及反应条件对其CO氧化活性的影响

邵建军; 朱锡; 申文杰

Co₃O₄/CeO₂的氧化还原性能及反应条件对其CO氧化活性的影响

1.
92493部队博士后科研工作站, 辽宁大连 116041;
2.
海军工程大学船舶与海洋工程系, 湖北武汉 430033;
3.
中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连 116041

基金项目: 中国博士后科学基金(20100471808)。

详细信息

通讯作者:
邵建军(1967- ), 男, 博士, 物理化学专业, Tel:0411-85888078; E-mail:sjj05@126.com。

中图分类号: O643
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- 文章访问数: 1428
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- 被引次数: 0
出版历程
- 收稿日期: 2011-02-11
- 修回日期: 2011-05-27
- 刊出日期: 2012-01-31

Redox property of Co₃O₄/CeO₂ and the effect of reaction conditions on its performance in CO oxidation

1.
Post-doctoral Scientific Research Station in 92493 Unit, Chinese People Liberation Army, Dalian 116041, China;
2.
Department of Naval Architecture &|Ocean Engineering, Naval University of Engineering, Wuhan 430033, China;
3.
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116041, China

摘要

摘要: 采用沉淀氧化法制备了Co₃O₄/CeO₂催化剂。运用XRD、BET和TPR表征手段,考察了不同钴铈比及焙烧温度对钴铈复合氧化物物理及化学性能的影响,并分别在干、湿条件下进行了一氧化碳氧化反应研究。结果表明,与纯的Co₃O₄相比,在不同比例的Co₃O₄/CeO₂均经723 K焙烧的各种催化剂中,钴铈原子比为9∶1的复合氧化物粒径较小,比表面积较大,说明适当比例铈的添加能使Co₃O₄具有较小的粒径。此氧化物经538 K温度焙烧制得的钴铈比为9∶1的复合氧化物中Co₃O₄平均粒径为7.2 nm, BET比表面积为167.6 m²/g。经TPR考察发现其具有最优的氧化还原性能。
- 氧化钴 /
- 氧化铈 /
- 一氧化碳 /
- 低温 /
- 氧化
Abstract: Co₃O₄/CeO₂ catalysts were prepared by co-precipitation-oxidation method and characterized by using X-ray diffraction (XRD), surface area (S_BET) measurement and temperature-programmed reduction (TPR). The effect of cobalt content in Co₃O₄/CeO₂ on its physical properties and catalytic performance in CO oxidation was investigated under both the humid and dry conditions. The results indicated that the Co₃O₄/CeO₂ composite with a Co/Ce atomic ratio of 9 (calcined at 723 K) exhibits much smaller particle size and higher surface area than pure Co₃O₄; the addition of cerium to Co₃O₄ is beneficial to obtain Co₃O₄ with small particle size. The average particle size and BET surface area of Co₃O₄ in the Co₃O₄/CeO₂ composite (Co/Ce atomic ratio=9) calcined at 538 K are 7.2 nm and 167.6 m²/g, respectively. Accordingly, the Co₃O₄/CeO₂ composite exhibits excellent redox property.
- Co₃O₄ /
- CeO₂ /
- carbon monoxide /
- low temperature /
- oxidation

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参考文献(24)

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