Coexistence of Cu+ and Cu2+ in star-shaped CeO2/CuxO catalyst for preferential CO oxidation

被引：32
|
作者：
Xie, Yu [1 ]
Yin, Yueling [1 ]
Zeng, Shanghong [1 ]
Gao, Meiyi [1 ]
Su, Haiquan [1 ]
机构：
[1] Inner Mongolia Univ, Sch Chem & Chem Engn, Hohhot 010021, Peoples R China
来源：
CATALYSIS COMMUNICATIONS | 2017年 / 99卷
基金：
中国国家自然科学基金;
关键词：
Copper valence; CO adsorption; Redox cycle; Hydrogen; CO-PROX; H-2-RICH GASES; OXIDE CATALYST; PROX REACTION; CEO2; HYDROGEN; MECHANISM; EVOLUTION; GROWTH; RU;
D O I：
10.1016/j.catcom.2017.06.003
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：
Star-shaped CeO2/CuxO catalysts very effective towards the CO-PROX reaction were synthesized by the impregnation method and characterized via FESEM, XRD, N-2 physisorption, H-2-TPR, XPS and in-situ DRIFTS. The importance of this work lies in the fact that the Cu oxidation state in the CeO2/CuxO catalysts was correlated with their activity and the former was influenced by the calcination temperature applied. In particular, CeO2/CuxO calcined at 300 and 350 degrees C consist of Cu+ and Cu2+ and their catalytic activity is higher than that of CeO2/CuxO calcined at 400 degrees C for which copper is in the Cu2+ state, as well as that of CeO2/CuxO calcined at 250 degrees C for which copper is in the Cu+ state. The star -shaped CeO2/CuxO catalysts calcined at 300 and 350 degrees C due to the presence of sufficient surface Cu+ and Cu2+ concentrations result in an enhanced CO-PROX performance. The slight deactivation observed after 30 h on reaction stream at T = 115 degrees C can result from the small progressive reduction of Cu+ and formation of carbonate and bicarbonate species on the catalyses surface.
引用
收藏
页码：110 / 114
页数：5
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