Ternary composite oxide catalysts CuO/Co3O4-CeO2 with wide temperature-window for the preferential oxidation of CO in H-2-rich stream

	Ternary composite oxide catalysts CuO/Co3O4-CeO2 with wide temperature-window for the preferential oxidation of CO in H-2-rich stream
	Chen, YN; Liu, DS; Yang, LJ; Meng, M; Zhang, J; Zheng, LR; Chu, SQ; Hu, TD; Zhang J(张静); Zheng LR(郑黎荣); Chu SQ(储胜启); Hu TD(胡天斗)
刊名	CHEMICAL ENGINEERING JOURNAL
	2013
卷号	234 页码:88-98
关键词	CO PROX CuO/Co3O4-CeO2 Temperature-window Characterization Mechanism
英文摘要	A series of ternary composite oxide catalysts CuO/CO3O4-CeO2 with variable Ce/(Co + Ce) atomic ratios were prepared and employed for the preferential oxidation of CO (CO PROX). Many techniques such as N-2-sorption, XRD, H-2-TPR, O-2-TPO, CO-TPD, O-2-TPD, Cu K-edge XAFS (including EXAFS and XANES) and in situ DRIFTS were used for catalyst characterization. The catalyst CuO/CO3O4-CeO2 with Ce/(Ce + Co) ratio of 0.1 exhibits the best performance, showing not only the lowest temperature for the complete oxidation of CO (98 degrees C), but also the broadest operating temperature window for full CO conversion (98-173 degrees C). The results of N-2-sorption and temperature-programmed characterizations including H2-TPR, O-2-TPO, CO-TPD and O-2-TPD show that the CuCoCe10 catalyst possesses the highest BET surface area, the best reducibility/oxidizability and the best performance for CO and O-2 adsorption. Linear combination fitting of Cu K-edge XANES spectra reveals that multiple Cu species including Cu-0, Cu+ and Cu2+ species co-exist in the spent catalyst CuCoCe10. Stable Cu+ carbonyl species are identified as the main active reaction intermediates as revealed by in situ DRIFTS. High temperature (>120 C) can lead to the reduction of Cu+ to Cu-0, enhancing H-2 oxidation; as a result, the selectivity of O-2 towards CO2 is decreased. Based upon in situ DRIFTS results, a potential CO PROX mechanism over CuO/CO3O4-CeO2 catalysts is proposed. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	Engineering
收录类别	SCI
WOS记录号	WOS:000328588300012
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/223831]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Chen, YN,Liu, DS,Yang, LJ,et al. Ternary composite oxide catalysts CuO/Co3O4-CeO2 with wide temperature-window for the preferential oxidation of CO in H-2-rich stream[J]. CHEMICAL ENGINEERING JOURNAL,2013,234:88-98.
APA	Chen, YN.,Liu, DS.,Yang, LJ.,Meng, M.,Zhang, J.,...&张静；郑黎荣；储胜启；胡天斗.(2013).Ternary composite oxide catalysts CuO/Co3O4-CeO2 with wide temperature-window for the preferential oxidation of CO in H-2-rich stream.CHEMICAL ENGINEERING JOURNAL,234,88-98.
MLA	Chen, YN,et al."Ternary composite oxide catalysts CuO/Co3O4-CeO2 with wide temperature-window for the preferential oxidation of CO in H-2-rich stream".CHEMICAL ENGINEERING JOURNAL 234(2013):88-98.