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Direct Hydrothermal Synthesis of Iron-Containing Mesoporous Silica SBA-15: Potential as a Support for Gold Nanoparticles
Li, Ying2; Guan, Yejun1; van Santen, Rutger A.1; Kooyman, Patricia J.3; Dugulan, Iulian4; Li, Can5; Hensen, Emiel J. M.1; Emiel J. M. Hensen
刊名JOURNAL OF PHYSICAL CHEMISTRY C
2009-12-31
DOI10.1021/jp908059y
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
关键词[WOS]CATALYTIC-PROPERTIES ; OXIDE NANOPARTICLES ; CRYSTALLINE WALLS ; CO OXIDATION ; GAMMA-FE2O3 ; TEMPERATURE ; GEL ; ADSORPTION ; SYSTEMS ; MATRIX
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.
语种英语
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WOS记录号WOS:000272936400051
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文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/103003
专题中国科学院大连化学物理研究所
通讯作者Emiel J. M. Hensen
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
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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.
APA Li, Ying.,Guan, Yejun.,van Santen, Rutger A..,Kooyman, Patricia J..,Dugulan, Iulian.,...&Emiel J. M. Hensen.(2009).Direct Hydrothermal Synthesis of Iron-Containing Mesoporous Silica SBA-15: Potential as a Support for Gold Nanoparticles.JOURNAL OF PHYSICAL CHEMISTRY C,113(52),21831-21839.
MLA Li, Ying,et al."Direct Hydrothermal Synthesis of Iron-Containing Mesoporous Silica SBA-15: Potential as a Support for Gold Nanoparticles".JOURNAL OF PHYSICAL CHEMISTRY C 113.52(2009):21831-21839.
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