Microstructure Evolution of a Co/MnO Catalyst for Fischer-Tropsch Synthesis Revealed by In Situ XAFS Studies
文献类型：期刊论文
| 作者 | Sun, FF; Sun, XP; Jin, YX; Yang, RO; Zhang, H; Liu, Y; Song, F; Li, XP; Wu, DS; Zhao, TJ |
| 刊名 | CHEMCATCHEM
 |
| 出版日期 | 2019 |
| 卷号 | 11期号:8页码:2187—2194 |
| 关键词 | X-RAY-ABSORPTION SUPPORTED COBALT CATALYSTS MANGANESE OXIDE MN PROMOTION CO/SIO2 HYDROCARBONS SPECTROSCOPY |
| ISSN号 | 1867-3880 |
| DOI | 10.1002/cctc.201900162 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Co-Mn catalysts have long been considered as a promising catalyst for Fischer-Tropsch synthesis (FTS). However, the promotional role of Mn and its interaction with Co remain unclear and controversial. In situ characterization of the structural change of FTS catalysts is a powerful way to reveal the reaction mechanisms. Nevertheless, there are significant difficulties because of the harsh reaction conditions. Here, the microstructure evolution of Co/MnO catalysts during FTS is monitored by in situ X-ray absorption fine structure (XAFS) spectroscopy under real FTS atmosphere up to 6 bar for the first time. Combined with in situ X-ray diffraction (XRD), ex situ high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and H-2 chemisorption characterizations, we reveal that the metallic Co liberated from Mn1-xCoxO during FTS leads to activity enhancement. The presence of Mn improves the Co dispersion. However, an initial association of Mn with the Co phase hampers the cobalt reducibility. We also find that increasing the reaction pressure enhances the oxygen dissociation on the Mn surface, which leads to an increased number of exposed Co sites and consequent FTS activity improvement. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/31712]  |
| 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.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China; 2.Kyoto Univ, Grad Sch Sci, Div Chem, Sakyo Ku, Kitashirakawa Oiwakecho, Kyoto 6068502, Japan 3.Univ Chinese Acad Sci, Beijing 100100, Peoples R China; 4.Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou, Fujian, Peoples R China; 5.Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China; 6.Shanghai Adv Res Inst, Shanghai 201210, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Sun, FF,Sun, XP,Jin, YX,et al. Microstructure Evolution of a Co/MnO Catalyst for Fischer-Tropsch Synthesis Revealed by In Situ XAFS Studies[J]. CHEMCATCHEM,2019,11(8):2187—2194. |
| APA | Sun, FF.,Sun, XP.,Jin, YX.,Yang, RO.,Zhang, H.,...&Jiang, Z.(2019).Microstructure Evolution of a Co/MnO Catalyst for Fischer-Tropsch Synthesis Revealed by In Situ XAFS Studies.CHEMCATCHEM,11(8),2187—2194. |
| MLA | Sun, FF,et al."Microstructure Evolution of a Co/MnO Catalyst for Fischer-Tropsch Synthesis Revealed by In Situ XAFS Studies".CHEMCATCHEM 11.8(2019):2187—2194. |
入库方式： OAI收割
来源：上海应用物理研究所
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