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

被引：5
|
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
收藏
页码：704 / 711
页数：8
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