In situ formation of the active sites in Pd-Au bimetallic nanocatalysts for CO oxidation: NAP (near ambient pressure) XPS and MS study

被引：49
作者：
Bukhtiyarov, A. V. [1 ]
Prosvirin, I. P. [1 ,2 ]
Saraev, A. A. [1 ,2 ]
Klyushin, A. Yu. [3 ]
Knop-Gericke, A. [3 ]
Bukhtiyarov, V. I. [1 ,2 ]
机构：
[1] SB RAS, Boreskov Inst Catalysis, Lavrentieva Ave 5, Novosibirsk 630090, Russia
[2] Novosibirsk State Univ, Pirogova Str 2, Novosibirsk 630090, Russia
[3] Max Planck Gesell, Fritz Haber Inst, Faradayweg 4-6, D-14195 Berlin, Germany
来源：
FARADAY DISCUSSIONS | 2018年 / 208卷
基金：
俄罗斯科学基金会;
关键词：
SURFACE SEGREGATION; ATMOSPHERIC PRESSURES; CATALYTIC-PROPERTIES; ULTRAHIGH-VACUUM; MODEL CATALYSTS; GOLD; ADSORPTION; NANOPARTICLES; NANOALLOYS; AUPD(100);
D O I：
10.1039/c7fd00219j
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：
Model bimetallic Pd-Au/HOPG catalysts have been investigated in the CO oxidation reaction using a combination of NAP XPS and MS techniques. The samples have shown catalytic activity at temperatures above 150 degrees C. The redistribution of Au and Pd on the surface depending on the reaction conditions has been demonstrated using NAP XPS. The Pd enrichment of the bimetallic particles' surface under reaction gas mixture has been shown. Apparently, CO adsorption induces Pd segregation on the surface. Heating the sample under reaction conditions above 150 degrees C decomposes the Pd-CO state due to CO desorption and reaction and simultaneous Pd-Au alloy formation on the surface takes place. Cooling back down to RT results in reversible Pd segregation due to Pd-CO formation and the sample becomes inactive. It has been shown that in situ studies are necessary for investigation of the active sites in Pd-Au bimetallic systems.
引用
收藏
页码：255 / 268
页数：14
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