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Zhang, Shoumin; Huang, Wei‐Ping; Qiu, Xiao-Hang; Li, Baoqing; Zheng, Xiu-Cheng; Wu, Shaohua

doi:10.1023/a:1015318525080

Cited by 88 publications

(23 citation statements)

References 11 publications

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“…Both CuO-CeO 2 and Cu-CeO 2 have been reported to have high catalytic activity to promote carbonm onoxide oxidation, [1] the water-gas shift reaction, [2,3] and methanol steam reforming. [4][5][6] Catalytic activity similar to or even better than traditional noblem etal catalysts has been achieved over coppercontaining ceria catalysts, for example, in carbon monoxide oxidation, [7] which promises an economicala lternative catalyst system.P ossible reaction pathways and active sites have been proposed recently.F or instance, Ta ng et al [8] proposed ar eaction pathway for CO oxidation over CuO-CeO 2 catalysts prepared by ad eposition-precipitation method, in which CO adsorbs ontot he copper and reacts with the adsorbed active oxygen on the CeO 2 support.…”

Section: Introductionmentioning

confidence: 99%

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

et al. 2017

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Understanding the correlation of thermal treatment with catalyst activity provides mechanistic information about how the catalysts can be activated or deactivated. In this paper, we report that a comparative study was conducted on CeO2 nanorod‐supported CuOx catalysts before and after reduction treatment to gain insight on the effects of the copper oxidation state and catalyst–support interfacial interactions on CO oxidation. X‐ray diffraction, Raman spectroscopy, hydrogen temperature‐programmed reduction (H2‐TPR), and transmission electron microscopy (TEM) were used in a comprehensive way to study the effects of CuOx (0≤x≤1) composition as well as their spatial distribution on CeO2 nanorods on the H2 consumption and CO oxidation of the catalysts. These techniques were then used to gain a better understanding of the correlation between the different copper species (α, β, and γ‐type CuOx) and the multiple reduction (H2 consumption) peaks, found in the H2‐TPR data during the first run and during in situ reduction and redox cycling experiments. Also concluded from this study is that an abundance of surface defects are found on CeO2 nanorods from high‐resolution TEM, which consequently may be critical to strong CuOx(0≤x≤1)–CeO2−x(0≤x≤0.5) interactions, therefore resulting in the improved low‐temperature catalytic activity.

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Section: Introductionmentioning

confidence: 99%

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

et al. 2017

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“…Concerning the nature of the active copper species, it is generally accepted that these are related to well-dispersed states of copper, probably in the form of copper oxide clusters in contact with the ceria and/or as an interfacial solid solution [3,[6][7][8][9][10][13][14][15][16][17][18][19][20][21][22][23]. The correlation between the reducibility of highly dispersed copper oxide species and their catalytic activity appears to be well established [3,5,7,8,13,16,[24][25][26][27][28]. A synergistic reaction model has been proposed in order to explain the enhanced catalytic activity shown by Cu-Ce oxide catalysts, in which Cu + species stabilized by interactions between copper oxide clusters and cerium oxide provide surface sites for CO adsorption, while ceria provides the oxygen source [3].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and reaction of CO on CuO–CeO2 catalysts prepared by the combustion method

Avgouropoulos

Ioannides

2007

Catal Lett

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Temperature-programmed techniques were employed to investigate the interaction of CO with CuO-CeO 2 prepared by the urea-nitrates combustion method. These catalysts exhibited high and stable CO oxidation activity at relatively low reaction temperatures (< 150°C). The CO adsorption capacity and catalytic activity of the catalysts was analogous to the concentration of easily-reduced copper oxide surface species. TPD and TPSR results can be explained by a dual scheme of CO adsorption: (i) on oxidized sites, which get reduced with simultaneous formation of surface CO 2 and (ii) on reduced sites created by the former interaction. 10-20% of adsorbed CO desorbs molecularly in the absence of gas-phase O 2 , but reacts totally towards CO 2 in the presence of gas-phase O 2 . Inhibition by CO 2 observed under steady-state CO oxidation conditions is due to CO 2 adsorption as found by CO 2 -TPD.

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“…It suggested that the reducibility is promoted by the interaction of CuO and CeO 2 . It has been reported that CeO 2 promotes the reduction of finely dispersed CuO species, and the smaller the CuO particles, the easier they are to reduce [7]. The reduction peak around at 130°C is attributed to the reduction of well dispersed Cu species and Cu ions strongly interacting with CeO 2 [26].…”

Section: H 2 -Tpr Resultsmentioning

confidence: 96%

“…But the high cost of precious metal, limited availability and low resistance to halogens greatly restrict their large-scale application [5,6]. These results have prompted the search for substitute catalyst [7]. Compared with noble metal catalysts, transitionmetal oxides and mixed transition-metal oxides are designed not only catalysts with different shape, but also these have a cheaper price.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Pore Structures on the Surface Textures of the Cu-Doped CeO2 Catalysts and Applied for CO Catalytic Oxidation

Tang

Han

et al. 2015

Catal Surv Asia

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By using mesoporous silica KIT-6 with different hydrothermal temperature as a template, Cu-doped CeO 2 catalysts with different pore diameters were successfully prepared. When KIT-6-50 (hydrothermal synthesis of mesoporous silica KIT-6 temperature was 50°C) and KIT-6-100 (hydrothermal synthesis of mesoporous silica KIT-6 temperature was 100°C) were employed as the hard template, the uncoupled sub-framework Cu-doped CeO 2 catalyst formed. When KIT-6-130 (hydrothermal synthesis of mesoporous silica KIT-6 temperature was 130°C) was employed as the hard template, the coupled sub-framework Cu-doped CeO 2 catalyst formed. Compared with the coupled sub-framework Cu-doped CeO 2 catalyst, the uncoupled sub-framework Cu-doped CeO 2 catalyst has the higher surface areas and more open system. The Cudoped CeO 2 catalyst with KIT-6-50 as a template exhibited the highest catalytic activity, and complete conversion temperature (T 100 ) was about 53°C for CO oxidation. Besides, it was investigated that there were more chemisorbed oxygen and oxygen vacancy on the surface of Cudoped CeO 2 with KIT-6-50 as a template catalyst by XPS analysis. It could be concluded that the higher surface area and more open system was relatively conducive to the catalytic oxidation of CO. At the same time, the chemisorbed oxygen and oxygen vacancy also played an important role in CO catalytic oxidation.

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Cited by 88 publications

References 11 publications

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

Adsorption and reaction of CO on CuO–CeO2 catalysts prepared by the combustion method

Effect of Different Pore Structures on the Surface Textures of the Cu-Doped CeO2 Catalysts and Applied for CO Catalytic Oxidation

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Untitled

Cited by 88 publications

References 11 publications

Effect of Reduction Treatment on CO Oxidation with CeO2 Nanorod‐Supported CuOx Catalysts

Effect of Reduction Treatment on CO Oxidation with CeO2 Nanorod‐Supported CuOx Catalysts

Adsorption and reaction of CO on CuO–CeO2 catalysts prepared by the combustion method

Effect of Different Pore Structures on the Surface Textures of the Cu-Doped CeO2 Catalysts and Applied for CO Catalytic Oxidation

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Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts

Effect of Reduction Treatment on CO Oxidation with CeO₂ Nanorod‐Supported CuO_x Catalysts