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题名: CO Oxidation Catalyzed by Au-Ag Bimetallic Nanoparticles Supported in Mesoporous Silica
作者: Yen, Chun-Wan1, 2;  Lin, Meng-Liang1, 2;  Wang, Aiqin1, 2, 3;  Chen, Shin-An4;  Chen, Jin-Ming4;  Mou, Chung-Yuan1, 2
通讯作者: Chung-Yuan Mou
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2009-10-15
DOI: 10.1021/jp9037683
卷: 113, 期:41, 页:17831-17839
收录类别: SCI
文章类型: Article
部门归属: 15
项目归属: 1501
产权排名: 2;3
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: We report a novel Au-Ag bimetallic nanocatalyst supported on an acidic mesoporous aluminosilicate Au-Ag@APTS-MCM prepared by a two-step synthesis procedure, which is very active for low-temperature CO oxidation, Its catalytic activity is still quite appreciable after 1 year of storage under room conditions. The silane APTS [H2N(CH2)(3)-Si(OMe)(3)] was used to surface functionalize mesoporous silica. The functionalized mesoporous silica was used to absorb the gold precursor AUCl(4)(-) and silver precursor AgNO3 to form gold-silver bimetallic nanoparticles inside the nanochannels after chemical reduction. The catalysts were activated by calcinations, followed with hydrogen reduction at 873 K. Using various characterization techniques, such as X-ray diffraction, UV-vis, transmission electrom microscopy, and X-ray absorption fine structure spectroscopy (EXAFS), we elucidated the structure and surface compositions. As compared with the previously reported Au-Ag@MCM, prepared by one-pot procedure, the new method yields smaller sizes of AuAg bimetallic nanoparticles (4-6 vs 20 nm). They exhibited higher activity in catalysis for low-temperature CO oxidation with high stability. Moreover, the catalyst is resistant to moisture over a long storage time. A synergetic effect in relative composition was also found. The EXAFS study shows that Ag predominantly resides on the surface of the bimetallic nanoparticle. This distribution helps to yield a catalyst that is very active in both CO and O-2 neighboring sites.
关键词[WOS]: GAS SHIFT REACTION ;  RAY-ABSORPTION-SPECTROSCOPY ;  CARBON-MONOXIDE OXIDATION ;  VAPOR-PHASE EPOXIDATION ;  GOLD CATALYSTS ;  ALLOY NANOPARTICLES ;  HIGH CONVERSION ;  PRETREATMENT ;  H-2 ;  HYDROGENATION
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000270459900038
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/102825
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.Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan
2.Natl Taiwan Univ, Ctr Condensed Matter Res, Taipei 106, Taiwan
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
4.Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

Recommended Citation:
Yen, Chun-Wan,Lin, Meng-Liang,Wang, Aiqin,et al. CO Oxidation Catalyzed by Au-Ag Bimetallic Nanoparticles Supported in Mesoporous Silica[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2009,113(41):17831-17839.
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