期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 168, 期 -, 页码 87-97出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2014.12.020
关键词
Isotopic exchange; Gold; Cobalt oxide; Copper oxide; Ceria; CO-PROX
资金
- Spanish MEC [ENE2007-67975]
- MEC
- Junta de Andalucia [P10-FQM-6766, FQM-110, FQM-334]
In this work isotopic exchange of O-18(2) with O-16 and oxidation of (CO)-O-16 were investigated at 130 degrees C on ceria-supported Au-CuO and Au-Co3O4 catalysts. Oxygen storage capacity (OSC) was measured at 400 degrees C to check the influence of the metals in the catalysts, resulting in an enhancement of OSC for gold-containing catalysts compared to monometallic catalysts. The reactivity of surface oxygen atoms and the oxygen availability from the samples were studied by two isothermal experiments, both feeding (CO)-O-16 (anaerobic oxidation (CO)-O-16/Ar and aerobic oxidation (CO)-O-16/O-2) to the O-18 pre-exchanged samples. Exchange leads to (CO)-O-18 formation and oxidation leads to (CO2)-O-16, (COO)-O-16-O-18 and (CO2)-O-18 formation. In anaerobic conditions the predominant reaction at the beginning is the exchange: a rapid exchange of (CO)-O-16 with the surface can be observed for all the samples except for CoCe that inhibits the exchange and the CO oxidation. In aerobic conditions, the predominant reaction is CO oxidation with the rapid increase of (CO2)-O-16 due to the relatively high O-16 coverage in reaction as a result of the (CO)-O-16 exchange and from exchange between O-18 surface species and O-16 bulk atoms. At 130 degrees C, bare ceria shows null activity in both aerobic and anaerobic oxidation. (C) 2014 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据