Mechanism of CO oxidation in excess H2 over CuO/CeO2 catalysts: ESR and TPD studies

Il’ichev, A. N.; Firsova, A. A.; Корчак, В. Н.

doi:10.1134/s002315840604015x

Cited by 39 publications

(36 citation statements)

References 14 publications

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“…However, the activity depends critically on the particle size and is hence susceptible to sintering [4]. Other materials investigated include Ru [5], RuO 2 [6], CuO/CeO 2 [7], Pd [8], Pt [9,10], and alloys such as Al 1 Mn 6.7 Co, and Ag 3.3 Mn 34.1 Co 1.7 Ni [11]. Recent research has shown that hydrous ruthenium oxide is a very active catalyst for the oxidation of CO.…”

Section: Introductionmentioning

confidence: 98%

Metallic osmium and ruthenium nanoparticles for CO oxidation

Leong

Zhong

2009

Journal of Organometallic Chemistry

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Section: Introductionmentioning

confidence: 98%

Metallic osmium and ruthenium nanoparticles for CO oxidation

Leong

Zhong

2009

Journal of Organometallic Chemistry

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“…The particular ability of this class of catalysts for the CO-PROX or related processes has been essentially attributed to the synergistic redox properties produced upon formation of copper oxide-ceria interfacial sites [4,6,9,10,[16][17][18][19][20][21][22][23][24][25][26][27]. In this sense, generally speaking, the properties of copper oxide entities for CO oxidation promotion apparently depend strongly on their dispersion degree and/or related degree of interaction with ceria [10,16,17,28].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Study on the Nature of Active Entities in Copper–Ceria CO-PROX Catalysts

et al. 2009

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A series of oxidised copper-ceria catalysts with varying copper loadings and prepared by two different methods (impregnation of ceria and coprecipitation of the two components within reverse microemulsions) have been examined with the aim of determining the nature of active entities for the two main (CO and H 2 ) competing oxidation reactions that take place during preferential oxidation of CO in H 2 -rich streams over this type of catalysts. The analysis is mainly based on operando spectroscopic exploration by DRIFTS and XANES as well as in situ analysis by Raman. The results allow establishing a model of the catalytic behaviour of this type of catalysts which can provide keys to control their CO-PROX catalytic properties.

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“…Their performances are mainly attributed to the synergistic redox properties of the copper-ceria interfacial sites [12][13][14][15][16][17][18]. In the preferential oxidation of carbon monoxide, the presence of oxygen vacancy defects (OVDs) and other lattice defects can play a very important role in the surface reactivity [18].…”

Section: Introductionmentioning

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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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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Mechanism of CO oxidation in excess H2 over CuO/CeO2 catalysts: ESR and TPD studies

Cited by 39 publications

References 14 publications

Metallic osmium and ruthenium nanoparticles for CO oxidation

Metallic osmium and ruthenium nanoparticles for CO oxidation

Spectroscopic Study on the Nature of Active Entities in Copper–Ceria CO-PROX Catalysts

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

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