CAS OpenIR  > 中科院上海应用物理研究所2011-2020年
LaOx(OH)y supported platinum catalysts for CO oxidation: Deactivation by formation of lanthanum carbonate
Jiang, Luozhen1,4; Chen, Junxiang3; Si, Rui1,2
2020
Source PublicationJournal of Rare Earths
ISSN1002-0721
Subtype期刊论文
AbstractPlatinum catalyst for CO oxidation has been studied for decades, due to its high activity and good stability. In this work, we prepared three different lanthanum oxide or hydroxide supports (LaOx(OH)y), and deposited platinum (Pt) with 0.5 at% via an impregnation approach to synthesize Pt/LaOx(OH)y catalysts. However, we find that these catalysts perform a poor stability for the CO oxidation reaction. The fresh and used samples were comprehensively characterized by multiple techniques including power X-ray diffraction (XRD), X-ray absorption fine structure (XAFS), transmission electron microscopy (TEM), temperature-programmed reduction by carbon monoxide (CO-TPR) and thermogravimetric analysis (TGA), to demonstrate that the oxidized platinum atoms or clusters, without any component of Pt–Pt metallic bond, are highly dispersed on the surface of LaOx(OH)y. Furthermore, the as-formed lanthanum carbonate (La2O2CO3) during the exposure to ambient circumstances or in the reaction atmosphere of CO + O2, severely impair the reactivity of Pt/LaOx(OH)y. On the basis of the obtained experimental results, we have drawn a conclusion that the oxidized PtOx atoms or PtxOy clusters are the active species for CO oxidation, while the formation of lanthanum carbonate is the origin of deactivation on reactivity. © 2020 Chinese Society of Rare Earths
KeywordCatalyst supports Carbon monoxide Carbonation High resolution transmission electron microscopy Oxidation Platinum Platinum compounds Thermogravimetric analysis X ray absorption Metallic bonds Platinum atoms Platinum catalysts Poor stability Reaction atmospheres Supported platinum catalysts Temperature programmed reduction X ray absorption fine structures
DOI10.1016/j.jre.2020.02.016
Indexed ByEI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/32971
Collection中科院上海应用物理研究所2011-2020年
Affiliation1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai; 201204, China;
2.Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Shanghai; 201204, China;
3.Division of China, TILON Group Technology Limited, Shanghai; 200090, China;
4.University of Chinese Academy of Sciences, Beijing; 100049, China
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GB/T 7714
Jiang, Luozhen,Chen, Junxiang,Si, Rui. LaOx(OH)y supported platinum catalysts for CO oxidation: Deactivation by formation of lanthanum carbonate[J]. Journal of Rare Earths,2020.
APA Jiang, Luozhen,Chen, Junxiang,&Si, Rui.(2020).LaOx(OH)y supported platinum catalysts for CO oxidation: Deactivation by formation of lanthanum carbonate.Journal of Rare Earths.
MLA Jiang, Luozhen,et al."LaOx(OH)y supported platinum catalysts for CO oxidation: Deactivation by formation of lanthanum carbonate".Journal of Rare Earths (2020).
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