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A study on the catalytic synergy effect between noble metals and cobalt phases in Ce-Al-O supported catalysts
Meng, M; Zha, YQ; Luo, JY; Hu, TD; Xie, YN; Liu, T; Zhang, J; Hu TD(胡天斗); Xie YN(谢亚宁); Liu T(刘涛); Zhang J(张静)
2006
发表期刊APPLIED CATALYSIS A-GENERAL
卷号301期号:2页码:#REF!
通讯作者Meng, M (reprint author), Tianjin Univ, Sch Chem Engn & Technol, Dept Catalysis Sci & Technol, Tianjin 300072, Peoples R China.
文章类型Article
摘要A series of Co-Pt(Pd, Rh)/Ce-Al-O catalysts were prepared by successive wetness impregnation method. The catalytic activities of the samples for CO oxidation were evaluated in a flow fixed-bed micro-reactor. The techniques of XRD, XPS, EXAFS, H-2-TPR and TPO-MS were employed to characterize the catalysts. The results of activity measurement show that for CO oxidation the presence of a small amount of noble metals greatly enhances the activity of Co/Ce-Al-O catalyst, the existence of cerium has increased the activity of the samples because of its capacity for oxygen storage and the interaction between cerium oxide and cobalt phase. The structural characterization results of XRD, XPS and EXAFS indicate that the cobalt in Co-Pt(Pd, Rh)/Ce-Al-O catalysts exists as metallic phase, while in Co/Ce-Al-O catalyst only part of the cobalt has been reduced to zero valence, the rest exists as Co-Al spinel which cannot be reduced at 450 degrees C by H-2. H-2-TPR results suggest that the hydrogen spillover may occur during the reduction pretreatment, and therefore increasing the reduction deepness of cobalt phases. The results of TPO-MS show that the oxygen spillover from noble metals to cobalt phase during CO oxidation is very potential. It decreases the activation energy of CO oxidation reaction and results in a prominent increase of the activity. The spilled over species, such as atomic H and O, generated on noble metal sites are mobile on the surface of the catalysts, which makes both of the close and remote cobalt phases involve in reactions at lower temperatures. Additionally, the coordination numbers from EXAFS indicate that the presence of noble metals greatly enhances the dispersion of cobalt phases. The order of this enhancement effect is Pt > Pd > Rh. As a result, the oxygen spillover effect and the enhancement effects on the reduction deepness and the dispersion of cobalt phases should be the main contributions to the catalytic synergy effect between cobalt phases and noble metals. (c) 2005 Elsevier B.V. All rights reserved.
关键词Co-Pt(Pd, Rh)/Ce-Al-O catalysts CO oxidation hydrogen spillover oxygen spillover catalytic synergy effect structural characterization
学科领域Chemistry; Environmental Sciences & Ecology
DOI10.1016/j.apcata.2005.06.035
收录类别SCI
WOS类目Chemistry, Physical ; Environmental Sciences
WOS记录号WOS:000235583100001
引用统计
被引频次:30[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/226491
专题多学科研究中心
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GB/T 7714
Meng, M,Zha, YQ,Luo, JY,et al. A study on the catalytic synergy effect between noble metals and cobalt phases in Ce-Al-O supported catalysts[J]. APPLIED CATALYSIS A-GENERAL,2006,301(2):#REF!.
APA Meng, M.,Zha, YQ.,Luo, JY.,Hu, TD.,Xie, YN.,...&张静.(2006).A study on the catalytic synergy effect between noble metals and cobalt phases in Ce-Al-O supported catalysts.APPLIED CATALYSIS A-GENERAL,301(2),#REF!.
MLA Meng, M,et al."A study on the catalytic synergy effect between noble metals and cobalt phases in Ce-Al-O supported catalysts".APPLIED CATALYSIS A-GENERAL 301.2(2006):#REF!.
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