Water-gas shift reaction over platinum/strontium apatite catalysts
文献类型：期刊论文
| 作者 | Xu, Hengyong3; Miao, Dengyun1,3; Cavusoglu, Guelperi2,4; Lichtenberg, Henning2,4; Yu, Jiafeng3; Goldbach, Andreas3; Grunwaldt, Jan-Dierk2,4 |
| 刊名 | APPLIED CATALYSIS B-ENVIRONMENTAL
 |
| 出版日期 | 2017-03-01 |
| 卷号 | 202页码:587-596 |
| 关键词 | Water-gas Shift Strontium Apatite Reaction Rate Exafs/xanes Pt Reduction |
| ISSN号 | 0926-3373 |
| DOI | 10.1016/j.apcatb.2016.09.059 |
| 文献子类 | Article |
| 英文摘要 | Platinum supported on calcium hydroxy (CaHAP) and fluoroapatite (CaFAP) exhibits excellent water-gas shift (WGS) activity comparable to the best Pt WGS catalysts on reducible oxides. The high activity of these unusual WGS catalysts is attributed to the parallel activation of CO on the noble metal and H2O on the ionic phosphates with formate species apparently being the major reaction intermediates. We have studied Pt supported on strontium hydroxy and fluoroapatites with varying cation-and noble metal contents now in order to elucidate the role of the apatite cations and anions on WGS activity. Initial Pt dispersions approached 100% for loadings up to 3% (weight) with mean particle sizes of 1-2 nm according to H-2 chemisorption and EXAFS results (coordination number of 6.6). TEM analyses show further that the Pt aggregates grew slightly during catalytic testing up to 723 K with 1.5-2.5 nm particles being most abundant afterwards. Moreover, Ptn+ reduction is much facilitated on these apatites as revealed by temperature programmed reduction coupled with in situ X-ray absorption spectroscopy (XAS). The WGS reaction rates in a reformate-type gas mixture increased strongly with Sr/P ratio in the apatite, with the rates over the most active Pt/SrHAP and Pt/SrFAP catalysts being among the highest reported to date. In particular, Pt/SrHAP and Pt/SrFAP rates surpassed the rates over analogous Ca2+ substituted catalysts by ca. 30% at 573 K. This demonstrates that apatite cations have a strong impact on WGS conversion over these systems opening a route to catalysts with potentially even higher WGS activity. (C) 2016 Elsevier B.V. All rights reserved. |
| WOS关键词 | RAY-ABSORPTION SPECTROSCOPY ; FUEL-CELL APPLICATIONS ; CO2 CAPTURE ; AQUEOUS-SOLUTION ; HYDROXYAPATITE ; MECHANISM ; STRONTIUM ; MEMBRANE ; SURFACE ; PERFORMANCE |
| WOS研究方向 | Chemistry ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000388052100060 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://cas-ir.dicp.ac.cn/handle/321008/169718]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 通讯作者 | Goldbach, Andreas |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Karlsruhe Inst Technol, Inst Chem Technol & Polymer Chem, D-76128 Karlsruhe, Germany 3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, 457 Zhongshan Rd, Dalian 116023, Peoples R China 4.Karlsruhe Inst Technol, Inst Catalysis Res & Technol, D-76344 Eggenstein Leopoldshafen, Germany |
| 推荐引用方式 GB/T 7714 | Xu, Hengyong,Miao, Dengyun,Cavusoglu, Guelperi,et al. Water-gas shift reaction over platinum/strontium apatite catalysts[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2017,202:587-596. |
| APA | Xu, Hengyong.,Miao, Dengyun.,Cavusoglu, Guelperi.,Lichtenberg, Henning.,Yu, Jiafeng.,...&Grunwaldt, Jan-Dierk.(2017).Water-gas shift reaction over platinum/strontium apatite catalysts.APPLIED CATALYSIS B-ENVIRONMENTAL,202,587-596. |
| MLA | Xu, Hengyong,et al."Water-gas shift reaction over platinum/strontium apatite catalysts".APPLIED CATALYSIS B-ENVIRONMENTAL 202(2017):587-596. |
入库方式： OAI收割
来源：大连化学物理研究所
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