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题名: Direct Hydrothermal Synthesis of Iron-Containing Mesoporous Silica SBA-15: Potential as a Support for Gold Nanoparticles
作者: Li, Ying2;  Guan, Yejun1;  van Santen, Rutger A.1;  Kooyman, Patricia J.3;  Dugulan, Iulian4;  Li, Can5;  Hensen, Emiel J. M.1
通讯作者: Emiel J. M. Hensen
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2009-12-31
DOI: 10.1021/jp908059y
卷: 113, 期:52, 页:21831-21839
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
产权排名: 5;6
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 preparation of mesoporous silica SBA-15 with high iron loadings (14-90 wt % Fe(2)O(3)) as a suitable Support for gold nanoparticles to be used in CO oxidation catalysis has been investigated. The support materials were prepared by a direct hydrothermal two-step pH adjusting method which consisted of the formation of the silica mesophase at low pH and the inclusion of Fe(3+) at varying pH in the range 2-7. The materials were characterized by XRD, SEM, and TEM/EDX, N(2) porosimetry, and (57)Fe Mossbauer spectroscopy. At relatively low Fe loading, the SBA-15 structure is maintained and iron is predominantly surface grafted to the silica surface. Such a mesoporous silica can accommodate up to 40 wt % Fe(2)O(3) with a surface area of 460 m(2)/g, With increasing Fe content, precipitation of iron hydroxides competes with the surface grafting process and the resulting materials are all intimate mixture of hematite particles embedded in an Fe/SBA-15 matrix. A too high Fe(3+) content in the synthesis gel results in a high rate of precipitation and impedes the formation of the silica mesophase. The stabilization of the rnesophase at pH 7 is proposed to involve interactions of the surfactant with a surface grafted Fe(3+) silica phase. The use of an SBA-15 which contains mainly surface grafted Fe(3+) as a support for gold nanoparticles results in a more active catalyst for CO oxidation than gold supported by SBA-15 or iron oxide particles.
关键词[WOS]: CATALYTIC-PROPERTIES ;  OXIDE NANOPARTICLES ;  CRYSTALLINE WALLS ;  CO OXIDATION ;  GAMMA-FE2O3 ;  TEMPERATURE ;  GEL ;  ADSORPTION ;  SYSTEMS ;  MATRIX
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000272936400051
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/103003
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.Eindhoven Univ Technol, Schuit Inst Catalysis, NL-5600 MB Eindhoven, Netherlands
2.Zhejiang Univ Technol, Inst Catalysis, Zhejiang Key Lab Green Chem Synth Technol, Hangzhou 310014, Zhejiang, Peoples R China
3.Delft Univ Technol, DCT TNW, NL-2628 BL Delft, Netherlands
4.Delft Univ Technol, R3 Reactor Inst, NL-2628 BL Delft, Netherlands
5.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian, Peoples R China

Recommended Citation:
Li, Ying,Guan, Yejun,van Santen, Rutger A.,et al. Direct Hydrothermal Synthesis of Iron-Containing Mesoporous Silica SBA-15: Potential as a Support for Gold Nanoparticles[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2009,113(52):21831-21839.
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