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学科主题: 物理化学
题名: Magnetic iron oxide nanoparticles coated by hierarchically structured silica: a highly stable nanocomposite system and ideal catalyst support
作者: Jin, Changzi1, 2;  Wang, Yanjie1;  Wei, Haisheng1;  Tang, Hailian1;  Liu, Xin1, 2;  Lua, Ting1;  Wang, Junhu1, 2
通讯作者: 王军虎
刊名: JOURNAL OF MATERIALS CHEMISTRY A
发表日期: 2014
DOI: 10.1039/c4ta00258j
卷: 2, 期:29, 页:11202-11208
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Energy & Fuels ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Energy & Fuels ;  Materials Science
英文摘要: A well-defined core-shell nanocomposite with magnetic iron oxide nanoparticles coated by a hierarchically structured silica shell has been synthesized through a sol-gel process and pseudomorphic transformation. The prepared materials were characterized by means of transmission electron microscopy, small and wide angle X-ray diffraction, Mossbauer spectroscopy and N-2 physical adsorption-desorption. It has been shown that the core-shell nanocomposite possesses a magnetic core in the form of Fe3O4 or gamma-Fe2O3 and a unique hierarchically structured silica shell consisting of an inner nonporous shell and outer shell with hierarchical pores. As a result, this nanocomposite exhibits high stability (acid resistance) and a large surface area (447 m(2) g(-1)), which will be especially suitable for use as catalyst supports. To demonstrate this point, a functional catalyst consisting of small Pt nanoparticles well-dispersed on the porous surface of the magnetic core-shell nanocomposite was fabricated. In the hydrogenation of nitrobenzene and 2-nitrochlorobenzene to the corresponding aniline compounds, the hierarchically porous catalyst showed superior performances to its counterpart with a monomodal porous structure. In addition, the used catalyst could be separated conveniently from the reaction system with an external magnetic field. Subsequent recycling tests further confirmed the outstanding reusability and regeneration ability of the composite catalyst.
关键词[WOS]: PSEUDOMORPHIC TRANSFORMATION ;  COMPOSITE MICROSPHERES ;  SHELL NANOPARTICLES ;  MESOPOROUS SPHERES ;  NANOSPHERES ;  FABRICATION ;  CARBON ;  NANOREACTORS ;  CARRIERS ;  PARTICLES
语种: 英语
WOS记录号: WOS:000339004100026
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/144323
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, Lab Catalysts & New Mat Aerosp, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Mossbauer Effect Data Ctr, Dalian 116023, Peoples R China

Recommended Citation:
Jin, Changzi,Wang, Yanjie,Wei, Haisheng,et al. Magnetic iron oxide nanoparticles coated by hierarchically structured silica: a highly stable nanocomposite system and ideal catalyst support[J]. JOURNAL OF MATERIALS CHEMISTRY A,2014,2(29):11202-11208.
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