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题名: Thin Porous Alumina Sheets as Supports for Stabilizing Gold Nanoparticles
作者: Wang, Jie1;  Lu, An-Hui1;  Li, Mingrun2;  Zhang, Weiping1;  Chen, Yong-Sheng3, 4;  Tian, Dong-Xu1;  Li, Wen-Cui1
关键词: porous alumina sheet ;  gold nanoparticles ;  strong interfacial interaction ;  high temperature ;  epitaxial growth
刊名: ACS NANO
发表日期: 2013-06-01
DOI: 10.1021/nn401446p
卷: 7, 期:6, 页:4902-4910
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Thin porous alumina sheets have been synthesized using a lysine-assisted hydrothermal approach resulting in an extraordinary catalyst support that can stabilize Au nanoparticles at annealing temperatures up to 900 degrees C. Remarkably, the unique architecture of such an alumina with thin sheets (average thickness similar to 15 nm and length 680 nm) and rough surface is beneficial to prevent gold nanoparticles from sintering. HRTEM observations clearly showed that the epitaxial growth between Au nanoparticles and alumina support was due to strong interfacial interactions, further explaining the high sinter-stability of the obtained Au/Al2O3 catalyst. Consequently, despite calcination at 700 degrees C, the catalyst maintains its gold nanoparticles of size predominantly 2 +/- 0.8 nm. Surprisingly, catalyst annealed at 900 degrees C retained the highly dispersed small gold nanoparticles. It was also observed that a few gold particles (6-25 nm) were encapsulated by an alumina layer (thickness less than 1 nm) to minimize the surface energy, revealing a surface restructuring of the gold/support interface. As a typical and size-dependent reaction, CO oxidation is used to evaluate the performance of Au/Al2O3 catalysts. The results obtained demonstrated Au/Al2O3 catalyst calcined at 700 degrees C exhibited excellent activity with a complete CO conversion at similar to 30 degrees C (T-100% = 30 degrees C), and even after calcination at 900 degrees C, the catalyst still achieved Its T-50% at 158 degrees C. In sharp contrast, Au catalyst prepared using conventional alumina support shows almost no activity under the same preparation and catalytic test conditions.
关键词[WOS]: CO OXIDATION ;  THERMAL-STABILITY ;  AU/AL2O3 CATALYST ;  EPITAXIAL-GROWTH ;  OXIDE CATALYSTS ;  RAPID SYNTHESIS ;  ZNO NANORODS ;  CARBON ;  METAL ;  SPECTROSCOPY
语种: 英语
WOS记录号: WOS:000321093800022
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137885
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.Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
3.Penn State Univ, EMS Energy Inst, University Pk, PA 16802 USA
4.Penn State Univ, John & Willie Leone Family Dept Energy & Mineral, University Pk, PA 16802 USA

Recommended Citation:
Wang, Jie,Lu, An-Hui,Li, Mingrun,et al. Thin Porous Alumina Sheets as Supports for Stabilizing Gold Nanoparticles[J]. ACS NANO,2013,7(6):4902-4910.
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