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题名: O-17 Solid-State NMR Study on the Size Dependence of Oxygen Activation over Silver Catalysts
作者: Wang, Xuefeng1;  Han, Xiuwen1;  Huang, Yining2;  Sun, Junming3;  Xu, Suochang1;  Bao, Xinhe1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2012-12-13
DOI: 10.1021/jp308637z
卷: 116, 期:49, 页:25846-25851
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: The capabilities of silver catalysts with different particle sizes for oxygen activation were systematically studied by O-17 solid-state NMR. The observation of O-17 signal at around 0 ppm for silver catalysts indicates that silver activates O-17(2) molecules and that subsequent formation of active O-17 species leads to the oxygen exchange with the mesoporous SiO2 supports. The initial appearances of the O-17 signals at different temperatures for three silver catalysts show that oxygen activation strongly depends on the size of Ag particle. Their ability of activating oxygen molecules is in the order Ag-3/MCM-41 > Ag-5/SBA-15 > Ag-10/SBA-15. Ag-3/MCM-41 is able to activate oxygen molecules and facilitates the oxygen exchange with the support even at room temperature. Although the NMR signal of active O-17 species on silver catalysts is not observed directly, the approach described in this work can be used to indirectly determine the conditions on which the active oxygen species can be produced during catalytic oxidation reactions. The silver catalysts can also be used for O-17 enrichment of the oxide-based materials under mild conditions.
关键词[WOS]: ANGLE-SPINNING NMR ;  CO OXIDATION ;  MAGIC-ANGLE ;  SHIELDING SCALE ;  GAS-PHASE ;  MQMAS NMR ;  EXCHANGE ;  EPOXIDATION ;  ETHYLENE ;  ZEOLITES
语种: 英语
WOS记录号: WOS:000312176100025
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143081
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada
3.Washington State Univ, Gene & Linda Voiland Sch Chem Engn & Bioengn, Pullman, WA 99164 USA

Recommended Citation:
Wang, Xuefeng,Han, Xiuwen,Huang, Yining,et al. O-17 Solid-State NMR Study on the Size Dependence of Oxygen Activation over Silver Catalysts[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2012,116(49):25846-25851.
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