3-D flower like Ce–Zr–Cu mixed oxide systems in the CO preferential oxidation (CO-PROX): Effect of catalyst composition

Moretti, Elisa; Storaro, Loretta; Talon, Aldo; Riello, Pietro; Infantes‐Molina, Antonia; Rodríguez‐Castellón, Enrique

doi:10.1016/j.apcatb.2014.12.032

Cited by 59 publications

(25 citation statements)

References 67 publications

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“…29 There have been only reported few examples of improved CO-PROX activity of copper oxide-cerium oxide activity upon ceria doping, [30][31][32] but the reasoning why some authors observe the positive effect of ceria doping while most do not has not been fully explained. It has been proposed that the incorporation of foreign cations into the ceria lattice hinders the extent of copper oxide-cerium oxide interaction and it is this interface where the most active sites for CO oxidation are located.…”

Section: Product Poisoning Versus Cu + -Co Carbonylmentioning

confidence: 99%

Role of Hydroxyl Groups in the Preferential Oxidation of CO over Copper Oxide–Cerium Oxide Catalysts

et al. 2016

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Model CuO/Ce 0.8 X 0.2 O δ catalysts (with X = Ce, Zr, La, Pr, or Nd) have been prepared in order to obtain CuO/ceria materials with different chemical features and have been characterized by X-ray diffraction, Raman spectroscopy, N 2 adsorption, and H 2 temperature-programmed reduction. CO-PROX experiments have been performed in a fixed-bed reactor and in an operando DRIFTS cell coupled to a mass spectrometer. The CO oxidation rate over CuO/ceria catalysts correlates with the formation of the Cu + −CO carbonyl above a critical temperature (90 °C for the experimental conditions in this study) because copper−carbonyl formation is the rate-limiting step. Above this temperature, CO oxidation capacity depends on the redox properties of the catalyst. However, decomposition of adsorbed intermediates is the slowest step below this threshold temperature. The hydroxyl groups on the catalyst surface play a key role in determining the nature of the carbon-based intermediates formed upon CO chemisorption and oxidation. Hydroxyls favor the formation of bicarbonates with respect to carbonates, and catalysts forming more bicarbonates produce faster CO oxidation rates than those which favor carbonates.

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Section: Product Poisoning Versus Cu + -Co Carbonylmentioning

confidence: 99%

Role of Hydroxyl Groups in the Preferential Oxidation of CO over Copper Oxide–Cerium Oxide Catalysts

et al. 2016

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“…Of course, in ceria nanomaterials, size and morphological properties are closely connected to redox properties, [68] therefore, it is quite common that alien species may alter both properties simultaneously.S uccessful approaches pursued within this context are based on the use of dopant cations at the ceria network or the deposition of ceria at other oxide carries. [68,69] Doping of ceria with maintenance of the cation at the oxide lattice under the reaction conditions and positive effects in catalytic activity has been achievedb yu sing Mn, Zn, Sn, Nb, Gd, Pr,T b, Sm, or Wf or CO-PROX, [70][71][72] WGS, [73][74][75][76] biogas, [77] and methanolo re thanol steam reforming. [78,79] The use of La, mostly as as urface modifier of ceria, can also be noted.…”

Section: Modification Of the M-ceo 2 Interface By The Presence Of Othmentioning

confidence: 99%

ChemInform Abstract: Role of the Interface in Base‐Metal Ceria‐Based Catalysts for Hydrogen Purification and Production Processes

2016

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“…Doping of ceria with maintenance of the cation at the oxide lattice under the reaction conditions and positive effects in catalytic activity has been achieved by using Mn, Zn, Sn, Nb, Gd, Pr, Tb, Sm, or W for CO‐PROX, WGS, biogas, and methanol or ethanol steam reforming . The use of La, mostly as a surface modifier of ceria, can also be noted .…”

Section: Modification Of the M‐ceo2 Interface By The Presence Of Othmentioning

confidence: 99%

“…The use of La, mostly as a surface modifier of ceria, can also be noted . In the case of CeZr mixed oxides, the best performance has been observed for Ce‐rich materials owing to both the high reducibility of the mixed oxide as well as the improved control of the metal particle size . The interaction of copper with CeZr has been analyzed by TEM and spectroscopic methods showing that the base metal is able to interact strongly with the oxide surfaces and thus to facilitate its stability under the reaction conditions .…”

Section: Modification Of the M‐ceo2 Interface By The Presence Of Othmentioning

confidence: 99%

Role of the Interface in Base‐Metal Ceria‐Based Catalysts for Hydrogen Purification and Production Processes

2015

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The role of the interface in Cu,Ni‐CeO2 catalysts used for novel hydrogen purification and production processes (preferential oxidation of CO, water–gas shift reactions, and the reforming of bio‐alcohols) is analyzed with an emphasis on the description of the physico‐chemical properties of the interface that have a critical influence on the catalytic properties. The direct contact between the base metal and ceria, as well as a contact mediated by alien species, are studied. Critical appraisal of the results indicates that specific base‐metal and ceria interaction situations control the redox response to the gas‐phase atmosphere. Together with specific base‐metal structural effects, these properties seem particularly important in controlling the interaction with CO and H2O as well as with carboxy/carboxylate moieties, and therefore, are important to drive the activity, selectivity, and stability for the mentioned catalytic processes.

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3-D flower like Ce–Zr–Cu mixed oxide systems in the CO preferential oxidation (CO-PROX): Effect of catalyst composition

Cited by 59 publications

References 67 publications

Role of Hydroxyl Groups in the Preferential Oxidation of CO over Copper Oxide–Cerium Oxide Catalysts

Role of Hydroxyl Groups in the Preferential Oxidation of CO over Copper Oxide–Cerium Oxide Catalysts

ChemInform Abstract: Role of the Interface in Base‐Metal Ceria‐Based Catalysts for Hydrogen Purification and Production Processes

Role of the Interface in Base‐Metal Ceria‐Based Catalysts for Hydrogen Purification and Production Processes

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