On the promoting effect of Au on CO oxidation kinetics of Au-Pt bimetallic nanoparticles supported on SiO2: An electronic effect?

被引：94

作者：

Doherty, Rachel P. ^{[1
,2
,3
]}

Krafft, Jean-Marc ^{[1
,2
]}

Methivier, Christophe ^{[1
,2
]}

Casale, Sandra ^{[1
,2
]}

Remita, Hynd ^{[3
,4
]}

Louis, Catherine ^{[1
,2
]}

Thomas, Cyril ^{[1
,2
]}

机构：

[1] UPMC, Lab Reactivite Surface, UMR 7197, F-75005 Paris, France

[2] CNRS, Lab Reactivite Surface, UMR 7197, F-75005 Paris, France

[3] Univ Paris 11, UMR 8000, Lab Chim Phys, F-91405 Orsay, France

[4] CNRS, UMR 8000, Lab Chim Phys, F-91405 Orsay, France

来源：

JOURNAL OF CATALYSIS | 2012年 / 287卷

关键词：

Radiolysis; PtAu alloys; CO-FTIR; Restructuring of nanoparticles; CO oxidation kinetics; Turnover rates; Electron transfer; NEAR-ATMOSPHERIC PRESSURES; CARBON-MONOXIDE; SELECTIVE HYDROGENATION; GOLD NANOPARTICLES; ULTRAHIGH-VACUUM; INFRARED-SPECTRA; CATALYSTS; PLATINUM; CLUSTERS; REACTIVITY;

D O I：

10.1016/j.jcat.2011.12.011

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：

Bimetallic AuPt nanoparticles prepared by radiolysis with Au/Pt atomic ratios of 1.2 and 1.8 were deposited onto silica and calcined to remove the stabilizing polymers. During this sequence, they lose their core shell structure and restructure as alloys. FTIR and XPS provide evidence for further AuPt NP restructuring under CO exposure and CO oxidation with Pt surface enrichment. A promoting effect of Au is found on the CO oxidation kinetics in the AuPt catalyst with the lower Au/Pt ratio. This effect is attributed to an electron enrichment of the Pt surface atoms due to charge transfer from Au to Pt, as indicated by XPS and CO-FTIR. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：102 / 113

页数：12

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