Formation mechanism of O2- radical anions in the adsorption of NO + O2 and NO2 + O2 mixtures on ZrO2 according to EPR and TPD data

被引：21
|
作者：
Il'ichev, AN [1 ]
Konin, GA
Matyshak, VA
Kuli-zade, AM
Korchak, VN
Yan, YB
机构：
[1] Russian Acad Sci, Semenov Inst Chem Phys, Moscow, Russia
[2] Russian Acad Sci, Far E Div, Inst Marine Geol & Geophys, Yuzhno Sakhalinsk, Russia
来源：
KINETICS AND CATALYSIS | 2002年 / 43卷 / 02期
关键词：
D O I：
10.1023/A:1015320528156
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 effects of various factors on the formation of 02 radical anions in the adsorption of an NO + O-2 or NO2 + O-2 Mixture on ZrO2 were studied. It was found that the thermal stability of the O-2(-) species depends on the composition of the adsorbed gas. It was suggested that nitrogen oxide complexes on ZrO2 centers are responsible for the formation of O-2(-). These centers are formed upon the treatment of the oxide in a vacuum; however, they are different from both coordinatively unsaturated Zr4+ cations (NO adsorption centers at 77 K) and Zr4+-O--O--Zr4+ centers, at which O-2(-) are formed because of the adsorption of H-2 + O-2. Based on the experimental data, the mechanism of O-2(-) formation in the adsorption of an NO + O-2 mixture is discussed.
引用
收藏
页码：214 / 222
页数：9
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