Oxidation-Induced Structural Changes in Sub-Nanometer Platinum Supported on Alumina

被引：4

作者：

Moses-DeBusk, Melanie ^{[2
]}

Allard, Lawrence F. ^{[1
]}

Blom, Douglas A. ^{[1
]}

Narula, Chaitanya K. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Energy & Transportat Sci Div, Oak Ridge, TN 37831 USA

来源：

CHEMCATCHEM | 2015年 / 7卷 / 15期

关键词：

aluminum; oxidation; platinum; scanning probe microscopy; supported catalysts; CO OXIDATION; CARBON-MONOXIDE; CATALYTIC-OXIDATION; GOLD NANOPARTICLES; ELEMENTARY STEPS; SINGLE; ATOM;

D O I：

10.1002/cctc.201500267

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：

Pt supported on alumina is an essential component of emission treatment catalysts used in transportation. Theoretical, experimental, and mechanistic aspects of Pt particles supported on a variety of supports have been studied extensively; however, available experimental information on the behavior of single versus sub-nanometer Pt is extremely limited. To bridge the knowledge gap between single supported Pt and well-formed supported Pt nanoparticles, we have performed the synthesis, characterization, and CO and NO oxidation studies of sub-nanometer Pt supported on -, -, and -Al2O3 and monitored the changes in structure upon exposure to CO and NO oxidation conditions. We find that sub-nanometer Pt is highly effective for CO oxidation because of the high Pt dispersion, but it is not very efficient as a NO oxidation catalyst. Furthermore, sub-nanometer Pt agglomerates rapidly under CO or NO oxidation conditions to form nanoparticles.

引用

页码：2391 / 2396

页数：6

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