AuPt alloy nanoparticles for CO-tolerant hydrogen activation: Architectural effects in Au-Pt bimetallic nanocatalysts

被引：165

作者：

Zhou, Shenghu ^{[1
]}

Jackson, Gregory S.

Eichhorn, Bryan

机构：

[1] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA

[2] Univ Maryland, Dept Mech Engn, College Pk, MD 20742 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2007年 / 17卷 / 16期

关键词：

D O I：

10.1002/adfm.200700216

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Colloidal suspensions of AuPt alloy nanoparticles (NPs) were prepared by using a rapid butyllithium reduction of AU(3+) and pt(4+) precursors in oleylamine. The resulting 2.5 nm (av) particles were characterized by TEM with EDX, XRD, XPS and UV-vis spectroscopy. With less butyllithium, nanowires are formed from fused NPs and grow to 100 nm in length. The activities of three different AuPt NP architectures (alloy, contact aggregate and monometallic NPs) were evaluated for catalytic hydrogen oxidation in CO-contaminated fuel streams (1.0% Pt loadings in Al2O3 supports). The alloy catalyst showed superior H-2 and CO oxidation activity, was unaffected by iron promoters and appears to operate by a different mechanism. The heteroaggregate showed a marked improvement in activity with iron promoters and is more selective for CO oxidation.

引用

页码：3099 / 3104

页数：6

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