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Water-gas shift reaction over platinum/strontium apatite catalysts
Miao, Dengyun1,2; Cavusoglu, Guelperi3,4; Lichtenberg, Henning3,4; Yu, Jiafeng1; Xu, Hengyong1; Grunwaldt, Jan-Dierk3,4; Goldbach, Andreas1
KeywordWater-gas Shift Strontium Apatite Reaction Rate Exafs/xanes Pt Reduction
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
2017-03-01
ISSN0926-3373
DOI10.1016/j.apcatb.2016.09.059
Volume202Pages:587-596
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
WOS KeywordRAY-ABSORPTION SPECTROSCOPY ; FUEL-CELL APPLICATIONS ; CO2 CAPTURE ; AQUEOUS-SOLUTION ; HYDROXYAPATITE ; MECHANISM ; STRONTIUM ; MEMBRANE ; SURFACE ; PERFORMANCE
AbstractPlatinum 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.
Language英语
WOS IDWOS:000388052100060
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/169719
Collection中国科学院大连化学物理研究所
Corresponding AuthorGoldbach, Andreas
Affiliation1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, 457 Zhongshan Rd, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Karlsruhe Inst Technol, Inst Catalysis Res & Technol, D-76344 Eggenstein Leopoldshafen, Germany
4.Karlsruhe Inst Technol, Inst Chem Technol & Polymer Chem, D-76128 Karlsruhe, Germany
Recommended Citation
GB/T 7714
Miao, Dengyun,Cavusoglu, Guelperi,Lichtenberg, Henning,et al. Water-gas shift reaction over platinum/strontium apatite catalysts[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2017,202:587-596.
APA Miao, Dengyun.,Cavusoglu, Guelperi.,Lichtenberg, Henning.,Yu, Jiafeng.,Xu, Hengyong.,...&Goldbach, Andreas.(2017).Water-gas shift reaction over platinum/strontium apatite catalysts.APPLIED CATALYSIS B-ENVIRONMENTAL,202,587-596.
MLA Miao, Dengyun,et al."Water-gas shift reaction over platinum/strontium apatite catalysts".APPLIED CATALYSIS B-ENVIRONMENTAL 202(2017):587-596.
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