Abstract: 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+δ)+ and copper Cu(3-δ)+. CO conversion increases by more than about 20% when O2 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 °C. Above this temperature, sequential decomposition takes place with the formation of Ag2Cu2O3 and, then, a mixture of Ag0 and CuO. Such transformation results in the loss of oxidizing ability at RT.

Cite: Svintsitskiy D.A. , Kardash T.Y. , Fedorova E.A. , Slavinskaya E.M. , Boronin A.I.
Room Temperature CO Oxidation over AgCuO2
Applied Surface Science. 2020. V.525. 146523 :1-10. DOI: 10.1016/j.apsusc.2020.146523 WOS Scopus РИНЦ AN OpenAlex

Dates:

Submitted:	Jan 15, 2020
Accepted:	Apr 26, 2020
Published online:	May 1, 2020
Published print:	Sep 30, 2020

Identifiers:

Web of science:	WOS:000541415900004
Scopus:	2-s2.0-85084341603
Elibrary:	43283211
Chemical Abstracts:	2020:906558
OpenAlex:	W3020825348

Citing:

DB	Citing
Scopus	8
Web of science	9
Elibrary	5
OpenAlex	10

Altmetrics: