Favorable synergetic effects between CuO and the reactive planes of ceria nanorods

Zhou, Kebin; Xu, Ruo; Sun, Xiaoming; Chen, Hongde; Tian, Qun; Shen, Dixin; Li, Yadong

doi:10.1007/s10562-005-4885-3

Cited by 62 publications

(36 citation statements)

References 23 publications

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“…In this sense, further than the general specific surface area value, the interfacial area and/or its physicochemical characteristics appear to be most relevant to explain CO oxidation activity achieved by the catalysts. In the latter sense, changes in the type of interacting oxides surfaces appear also of relevancy, as reported in studies in which copper/ceria samples with different specific faces exposed in the CeO 2 component were prepared [52,53]. More doubts exist with respect to the selectivity (i.e.…”

Section: Co-prox Catalytic Activitymentioning

confidence: 82%

“…Concerning the former (CO oxidation), there is general consensus that it can be related to the presence of reduced states of copper (in the form of Cu + ) at copper oxide-ceria interfacial positions. The interfacial character of such sites basically determines that well dispersed CuO entities contribute most to the activity, although active interfaces could be obtained either in direct (CuO/CeO 2 ) or inverse (CeO 2 /CuO) configurations, the latter having large size CuO particles [52,53]. Such interfacial reduced states of copper could either be present in the initial catalyst [16] or (when starting with fully oxidized catalysts) are formed during the course of the reaction as a consequence of redox interaction with the reactant mixture [21].…”

Section: Co-prox Catalytic Activitymentioning

confidence: 99%

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Preferential CO oxidation (CO-PROX) catalyzed by CuO supported on nanocrystalline CeO2 prepared by a freeze-drying method

Arango-Díaz

Moretti

Talon

et al. 2014

Applied Catalysis A: General

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a b s t r a c tNanocrystalline CeO 2 with a regular size of 9.5 nm was prepared by a freeze-drying method, and subsequent impregnated with a Cu(II) acetate solution, varying the loading of Cu (3, 6, 12 wt.%). The resulting CuO/CeO 2 materials were characterized by N 2 physisorption at −196 • C, HRTEM, H 2 -TPR, X-ray diffraction, Raman spectroscopy and XPS and tested as catalysts in the preferential CO oxidation in a H 2 -rich stream (CO-PROX) in the temperature range • C. In spite of their low specific surface areas the catalysts exhibited a good catalytic performance, resulting active and selective in the CO-PROX reaction at low temperatures. The inhibiting effect of the simultaneous presence of CO 2 (15 vol.%) and H 2 O (10 vol.%) in the reaction mixture on the performance of CuO-CeO 2 catalysts was also investigated. The addition of CO 2 and water in the gas stream depressed CO oxidation up to 160• C, its effect being negligible at higher temperatures. Nevertheless, despite these expected deactivation phenomena, a CO conversion value higher than 90% and a CO 2 selectivity of about 90% was achieved for all the samples at 160• C. The excellent performance, especially shown by the catalyst with 6 wt%. of copper, has been related to the wide dispersion of the copper active sites associated with the high amount of Ce 4+ species before reaction.

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Section: Co-prox Catalytic Activitymentioning

confidence: 82%

Section: Co-prox Catalytic Activitymentioning

confidence: 99%

Preferential CO oxidation (CO-PROX) catalyzed by CuO supported on nanocrystalline CeO2 prepared by a freeze-drying method

Arango-Díaz

Moretti

Talon

et al. 2014

Applied Catalysis A: General

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“…Through a deposition-precipitation method, CeO 2 nanorod-supported CuO catalysts were prepared. [66] It was found that CuO/CeO 2 -nanorods were more active for CO oxidation than the CuO/CeO 2 NPs. Temperature-programmed reduction (TPR) studies revealed a more favorable synergetic effect between CuO and ceria over CuO/CeO 2 nanorods compared with CuO/CeO 2 NPs.…”

Section: Supported Catalystsmentioning

confidence: 99%

Catalysis Based on Nanocrystals with Well‐Defined Facets

2011

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Using bottom-up chemistry techniques, the composition, size, and shape in particular can now be controlled uniformly for each and every nanocrystal (NC). Research into shape-controlled NCs have shown that the catalytic properties of a material are sensitive not only to the size but also to the shape of the NCs as a consequence of well-defined facets. These findings are of great importance for modern heterogeneous catalysis research. First, a rational synthesis of catalysts might be achieved, since desired activity and selectivity would be acquired by simply tuning the shape, that is, the exposed crystal facets, of a NC catalyst. Second, shape-controlled NCs are relatively simple systems, in contrast to traditional complex solids, suggesting that they may serve as novel model catalysts to bridge the gap between model surfaces and real catalysts.

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“…Af ew studies were performed to elucidatet he synergistic effect between CuO and CeO 2 nanorods. [18] As the active sites (Cu, Cu + ,C u 2 + ,C uO x -CeO 2 )f or CO adsorption andc onversion in CuO x -CeO 2 still remain obscure, to further understand the CuO/Cu-CeO 2 interfacial effect, a comparative study was conducted on CeO 2 nanorod-supported CuO and reduced CeO 2 nanorod-supported CuO x catalysts for CO oxidation in this study.…”

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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Favorable synergetic effects between CuO and the reactive planes of ceria nanorods

Abstract: High-energy, more reactive {001} and {110} planes of CeO 2 nanorods were found to generate favorable synergetic effects between CuO and ceria, resulting in significant enhancement of the copper catalyst performance for CO oxidation.

Cited by 62 publications

References 23 publications

Preferential CO oxidation (CO-PROX) catalyzed by CuO supported on nanocrystalline CeO2 prepared by a freeze-drying method

Preferential CO oxidation (CO-PROX) catalyzed by CuO supported on nanocrystalline CeO2 prepared by a freeze-drying method

Catalysis Based on Nanocrystals with Well‐Defined Facets

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

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Favorable synergetic effects between CuO and the reactive planes of ceria nanorods

Abstract: High-energy, more reactive {001} and {110} planes of CeO 2 nanorods were found to generate favorable synergetic effects between CuO and ceria, resulting in significant enhancement of the copper catalyst performance for CO oxidation.

Cited by 62 publications

References 23 publications

Preferential CO oxidation (CO-PROX) catalyzed by CuO supported on nanocrystalline CeO2 prepared by a freeze-drying method

Preferential CO oxidation (CO-PROX) catalyzed by CuO supported on nanocrystalline CeO2 prepared by a freeze-drying method

Catalysis Based on Nanocrystals with Well‐Defined Facets

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

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