Deactivation of a Au/CeO2–Co3O4 catalyst during CO preferential oxidation in H2-rich stream

Wang, Hui; Zhu, Hua; Qin, Zhangfeng; Liang, Feixue; Wang, Guofu; Wang, Jianguo

doi:10.1016/j.jcat.2009.04.003

Cited by 126 publications

(67 citation statements)

References 42 publications

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“…Within the studied supports, usually metal oxides, there are reports about the use of MnOx [44], Fe2O3 [45], and Co2O3 [46], among others. Their intrinsic ability for the CO oxidation is due to some oxygen species that are especially activated through electronic transfer between them and the metallic cations, allowing a successful activation of the CO and O2 molecules for CO2 production.…”

Section: Introductionmentioning

confidence: 99%

Au/CeO2 Catalysts: Structure and CO Oxidation Activity

et al. 2016

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Abstract:In this comprehensive review, the main aspects of using Au/CeO 2 catalysts in oxidation reactions are considered. The influence of the preparation methods and synthetic parameters, as well as the characteristics of the ceria support (presence of doping cations, oxygen vacancies concentration, surface area, redox properties, etc.) in the dispersion and chemical state of gold are revised. The proposed review provides a detailed analysis of the literature data concerning the state of the art and the applications of gold-ceria systems in oxidation reactions.

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Section: Introductionmentioning

confidence: 99%

Au/CeO2 Catalysts: Structure and CO Oxidation Activity

et al. 2016

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“…Obviously, three (α, β and γ) peaks can be observed. Peaks of α and β are attributed to the reduction of the CuO species, α peak corresponds to the reduction of highly dispersed CuO particles which have strong interaction with CeO 2 -Co 3 O 4 composite oxides, while β peak corresponds to bulk CuO and partial CeO 2 [10][11][12] . And γ peak can be assigned to the reduction of supports.…”

Section: Content Determinationmentioning

confidence: 99%

“…The noble metal catalysts (such as Pt, Au, etc.) have been found the most effectual for CO-PROX [8][9][10][11] . Nevertheless, the poor selectivity and high cost greatly limit their applications.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Preferential Co Oxidation Activity Over Cuo/Co3o4-Ceo2 Catalysts: Effect of Co/Ce Ratio

Wang

Chen

Deng

et al. 2014

J. Chil. Chem. Soc.

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A series of Co 3 O 4 -CeO 2 supports with different Co/Ce ratio have been synthesized by using polyethyleneglycol (PEG) as a surfactant. The catalytic performance tests indicated the activity of the catalysts is better than the corresponding support. In addition, CuO/(0.7)Co 3 O 4 -CeO 2 displayed the best activity with 100% CO conversion and 93% O 2 selectivity at 120 °C. Furthermore, the stability test of CuO/(0.7)Co 3 O 4 -CeO 2 expressed the activity can be retained at 80% for 80h at 100 °C. Catalysts and supports were characterized by BET, XRD, TPR and TPD techniques. Discussion of the results showed that the strongest lattice distortion and the best reducibility of Co 3 O 4 -CeO 2 supports were both negative factors for the catalytic activity. More precisely, an appropriate Co/Ce ratio can restrain the stronger interaction between cobalt oxide and ceria to promote the formation of reducible copper species.

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“…Catalysts for CO PROX are mainly the precious metals catalysts (such as Pt, Ru and Rh), gold-based catalysts and CuO-based catalysts 1,5 . Of these catalysts, catalysts based on combinations between copper and cerium oxides have also shown promising properties for CO PROX and constitute a more interesting alternative from an economical point of view.…”

Section: Introductionmentioning

confidence: 99%

“…Of these catalysts, catalysts based on combinations between copper and cerium oxides have also shown promising properties for CO PROX and constitute a more interesting alternative from an economical point of view. Extensive investigations have been carried out about the preparation methods, characterization, mechanism and testing of CuO/CeO 2 catalysts [3][4][5][6][7][8] . Some researchers reported the performance of CuO/CeO 2 catalysts was superior to that of Pt-based catalysts because of strong interactions between the copper species and the CeO 2 support 6,7 .…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF PREPARATION METHODS OF CeO2-MnOx MIXED OXIDES ON PREFERENTIAL OXIDATION OF CO IN H2-RICH GASES OVER CuO-BASED CATALYSTS

Gong

Wang

Zhang

2012

J. Chil. Chem. Soc.

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The CeO 2 -MnO x mixed oxides were prepared by deposition-precipitation (DP) and surfactant-templated (CB) methods, and then used as the support of CuO/ CeO 2 -MnO x catalysts. The samples were characterized by means of XRD, BET, H 2 -TPR, CO-TPD and XPS. Results show that preparation methods of CeO 2 -MnO x support have a direct effect on the physicochemical properties and catalytic activities of CuO/CeO 2 -MnO x catalysts for the CO preferential oxidation in H 2 -rich gases(CO PROX). CuO/CeO 2 -MnO x (CB) catalyst exhibits higher CO conversion and stability in H 2 -rich gases than CuO/CeO 2 -MnO x (DP), with 100% conversion of CO at 140 °C after a temperature cycle, which indicates that CeO 2 -MnO x (CB) as support of CuO based catalyst is more useful for CO PROX reaction than CeO 2 -MnO x (DP). Compared with CuO/CeO 2 -MnO x (DP), there are richer oxygen vacancies and more Mn 4+ species on the surface of CuO/CeO 2 -MnO x (CB), and stronger interaction between CeO 2 and MnO x in it. More amounts of active copper species and complicated transfer of electrons density on CuO/CeO 2 -MnO x (CB) also favour the activity of the catalyst.

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Deactivation of a Au/CeO2–Co3O4 catalyst during CO preferential oxidation in H2-rich stream

Cited by 126 publications

References 42 publications

Au/CeO2 Catalysts: Structure and CO Oxidation Activity

Au/CeO2 Catalysts: Structure and CO Oxidation Activity

Improvement of Preferential Co Oxidation Activity Over Cuo/Co3o4-Ceo2 Catalysts: Effect of Co/Ce Ratio

EFFECT OF PREPARATION METHODS OF CeO2-MnOx MIXED OXIDES ON PREFERENTIAL OXIDATION OF CO IN H2-RICH GASES OVER CuO-BASED CATALYSTS

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