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CO Oxidation Catalyzed by Au-Ag Bimetallic Nanoparticles Supported in Mesoporous Silica
Yen, Chun-Wan1,2; Lin, Meng-Liang1,2; Wang, Aiqin1,2,3; Chen, Shin-An4; Chen, Jin-Ming4; Mou, Chung-Yuan1,2; Chung-Yuan Mou
刊名JOURNAL OF PHYSICAL CHEMISTRY C
2009-10-15
DOI10.1021/jp9037683
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
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
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.
语种英语
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WOS记录号WOS:000270459900038
引用统计
被引频次:122[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/102825
专题中国科学院大连化学物理研究所
通讯作者Chung-Yuan Mou
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
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GB/T 7714
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.
APA Yen, Chun-Wan.,Lin, Meng-Liang.,Wang, Aiqin.,Chen, Shin-An.,Chen, Jin-Ming.,...&Chung-Yuan Mou.(2009).CO Oxidation Catalyzed by Au-Ag Bimetallic Nanoparticles Supported in Mesoporous Silica.JOURNAL OF PHYSICAL CHEMISTRY C,113(41),17831-17839.
MLA Yen, Chun-Wan,et al."CO Oxidation Catalyzed by Au-Ag Bimetallic Nanoparticles Supported in Mesoporous Silica".JOURNAL OF PHYSICAL CHEMISTRY C 113.41(2009):17831-17839.
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