Thermal stability of Ag-Au, Cu-Au, and Ag-Cu bimetallic nanoparticles supported on highly oriented pyrolytic graphite

被引：6

作者：

Bukhtiyarov, A. V. ^{[1
]}

Prosvirin, I. P. ^{[1
]}

Chetyrin, I. A. ^{[1
]}

Saraev, A. A. ^{[1
]}

Kaichev, V. V. ^{[1
]}

Bukhtiyarov, V. I. ^{[1
]}

机构：

[1] Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia

来源：

KINETICS AND CATALYSIS | 2016年 / 57卷 / 05期

基金：

俄罗斯科学基金会;

关键词：

bimetallic catalysts; highly oriented pyrolytic graphite; X-ray photoelectron spectroscopy; thermal stability; CO OXIDATION; CATALYTIC-PROPERTIES; ALLOY CATALYSTS; PARTICLE-SIZE; PD; GOLD; SURFACES; XPS; ADSORPTION; VACUUM;

D O I：

10.1134/S0023158416050049

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：

The formation of Ag-Au, Cu-Au, and Ag-Cu bimetallic particles on the surface of highly oriented pyrolytic graphite was studied by X-ray photoelectron spectroscopy. Samples with the core-shell structure of particles were prepared by sequential thermal vacuum deposition. The thermal stability of the samples was studied over a wide range of temperatures (25-400A degrees C) under ultrahigh-vacuum conditions. The heating of the samples to similar to 250A degrees C leads to the formation of bimetallic alloy particles with a relatively uniform distribution of metals in the bulk. The thermal stability of the samples with respect to sintering depends on the nature of the supported metals. Thus, the Ag-Au particles exhibited the highest thermal resistance (similar to 350A degrees C) under ultrahigh-vacuum conditions, whereas the Ag-Cu particles agglomerated even at similar to 250A degrees C.

引用

页码：704 / 711

页数：8

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