LaOx(OH)y supported platinum catalysts for CO oxidation: Deactivation by formation of lanthanum carbonate
文献类型：期刊论文
| 作者 | Jiang, Luozhen1,2; Chen, Junxiang3; Si, Rui1,4 |
| 刊名 | Journal of Rare Earths
 |
| 出版日期 | 2020 |
| 关键词 | Catalyst 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 |
| ISSN号 | 1002-0721 |
| DOI | 10.1016/j.jre.2020.02.016 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Platinum 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 |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/32971]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai; 201204, China; 2.University of Chinese Academy of Sciences, Beijing; 100049, China 3.Division of China, TILON Group Technology Limited, Shanghai; 200090, China; 4.Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Shanghai; 201204, China; |
| 推荐引用方式 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). |
入库方式： OAI收割
来源：上海应用物理研究所
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