Room temperature CO oxidation over AgCuO2

被引:10
|
作者
Svintsitskiy, Dmitry A. [1 ,2 ]
Kardash, Tatyana Yu. [1 ,2 ]
Fedorova, Elizaveta A. [1 ]
Slavinskaya, Elena M. [1 ,2 ]
Boronin, Andrei I. [1 ,2 ]
机构
[1] Boreskov Inst Catalysis, Pr Lavrentieva 5, Novosibirsk 630090, Russia
[2] Novosibirsk State Univ, St Pirogova 2, Novosibirsk 630090, Russia
关键词
Carbon monoxide; Heterogeneous catalysis; Mixed silver-copper oxide; Oxidation; Surface chemistry; CARBON-MONOXIDE; PREFERENTIAL OXIDATION; ELECTRONIC-STRUCTURE; CATALYTIC-PROPERTIES; SELECTIVE OXIDATION; OXIDIZED SILVER; COPPER; CUO; NANOPARTICLES; ADSORPTION;
D O I
10.1016/j.apsusc.2020.146523
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
Mixed silver-copper oxide AgCuO2 is able to interact with CO at room temperature (RT). Such interaction is provided by the participation of the reactive oxygen species associated with deeply oxidized states of silver Ag(1+delta)+ and copper Cu(3-delta)+. CO conversion increases by more than about 20% when O-2 appears in the reaction mixture. It indicates the contribution of catalytic oxidation over AgCuO2 with participation of gas-phase oxygen. It was shown that oxidizing ability of AgCuO2 decreased during prolonged interaction as a result of accumulation of surface bicarbonates. The rate of AgCuO2 deactivation at RT is significantly increased under wet conditions. The examination of thermal stability under reducing reaction medium showed that the AgCuO2 crystal structure is not stable at temperatures higher than 75 degrees C. Above this temperature, sequential decomposition takes place with the formation of Ag(2)Cu2O(3) and, then, a mixture of Ag-0 and CuO. Such transformation results in the loss of oxidizing ability at RT.
引用
收藏
页数:10
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