CO Oxidation on Unsupported Dendrimer-Encapsulated Gold Nanoparticles

被引：13
|
作者：
Kracke, Peter [1 ]
Haas, Terry [2 ]
Saltsburg, Howard [1 ]
Flytzani-Stephanopoulos, Maria [1 ]
机构：
[1] Tufts Univ, Dept Chem & Biol Engn, Medford, MA 02155 USA
[2] Tufts Univ, Dept Chem, Medford, MA 02155 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 39期
基金：
美国国家科学基金会;
关键词：
SUPPORTED AU CATALYSTS; NARROW SIZE DISTRIBUTIONS; AQUEOUS-PHASE OXIDATION; CARBON-MONOXIDE; ELECTRONIC-STATE; NANOPOROUS GOLD; PARTICLE-SIZE; ACTIVE GOLD; CLUSTERS; NANOCLUSTERS;
D O I：
10.1021/jp101404c
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：
Unsupported gold nanoparticles in solution are reported here for the first time to catalyze the oxidation of CO at ambient conditions. Gold was stabilized in solution by various polyamidoamine dendrimers. Dendrimer- encapsulated gold nanoparticles (DENs) 0.5-2.5 nm in diameter have low initial activity. With storage time, however, the activity of the aged DENs increased and became comparable to a reference Au-TiO2 catalyst with the same gold loading and average gold particle size, which was tested under the same reaction conditions. The activation is attributed to partial hydrolysis of gold as followed by UV-vis spectroscopy.
引用
收藏
页码：16401 / 16407
页数：7
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