The role of pore size and structure on the thermal stability of gold nanoparticles within mesoporous silica

被引:162
作者
Bore, MT
Pham, HN
Switzer, EE
Ward, TL
Fukuoka, A
Datye, AK [1 ]
机构
[1] Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA
[2] Univ New Mexico, Ceram & Composite Mat Ctr, Albuquerque, NM 87131 USA
[3] Hokkaido Univ, Ctr Catalysis Res, Sapporo, Hokkaido 0010021, Japan
关键词
D O I
10.1021/jp045917p
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Highly dispersed gold particles (<2 nm) were synthesized within the pores of mesoporous silica with pore sizes ranging from 2.2 to 6.5 nm and different pore structures (2D-hexagonal, 3D-hexagonal, and cubic). The catalysts were reduced in flowing H-2 at 200 degreesC and then used for CO oxidation at temperatures ranging from 25 to 400 degreesC. The objective of this study was to investigate the role of-pore size and structure in controlling the thermal sintering of An nanoparticles. Our study shows that sintering of An particles is dependent on pore size, pore wall thickness (strength of pores), and pore connectivity. A combination of high-resolution TEM/STEM and SEM was used to measure the particle size distribution and to determine whether the An particles were located within the pores or had migrated to the external silica surface.
引用
收藏
页码:2873 / 2880
页数:8
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