Comparative study of CuO supported on CeO2, Ce0.8Zr0.2O2 and Ce0.8Al0.2O2 based catalysts in the CO-PROX reaction

Arango-Díaz, A.; Cecilia, Juan Antonio; Moretti, Elisa; Talon, Aldo; Núñez, P.; Marrero-Jerez, J.; Jiménez-Jiménez, José; Jiménez-López, A.; Rodríguez‐Castellón, Enrique

doi:10.1016/j.ijhydene.2013.04.062

Cited by 41 publications

(35 citation statements)

References 18 publications

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“…The presence of zirconium in the support provokes an increasing of the Ce 3+ /Ce 4+ ratio on the surface of the catalyst that suggests that zirconium favors the presence of Ce 3+ [27].…”

Section: Xpsmentioning

confidence: 99%

“…However, the anode However, due to the high cost and limited availability the development of new catalytic systems more abundant and less expensive is necessary. In this sense, non-precious metal based catalysts are considered as promising alternatives and catalysts based on the closely interacting CuO-CeO 2 have been purposed as promising for the CO-PROX reaction for their high activity, selectivity and relatively low cost [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. For copper-ceria system, the establishment of an intimate contact between both components produces a promoting effect for ceria with fluorite-type structure, responsible of the high oxygen mobility [30,31] leading to both change in redox state capacity and bifunctional promotion.…”

Section: Introductionmentioning

confidence: 99%

“…Thereafter, the redox process for the CO oxidation produces the reduction and oxidation of both the copper and ceria phases [32]. The redox behavior of CuO-CeO 2 systems can be enhanced by the incorporation of heteroatoms as zirconium, which can improve the oxygen storage capacity by the increase of defects in the framework [27,33,34]. Moreover ceria and ceria/zirconia finely dispersed on Al 2 O 3 as support were described.…”

Section: Introductionmentioning

confidence: 99%

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CuO-CeO2 supported on montmorillonite-derived porous clay heterostructures (PCH) for preferential CO oxidation in H2-rich stream

et al. 2015

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a b s t r a c tThis study reports on the preparation and characterization of porous clay heterostructures (PCH) as a high-surface-area support for CuO-CeO 2 based catalysts for the preferential oxidation of CO in excess of H 2 (CO-PROX). After pillaring the montmorillonite clay with silica (Si-PCH) and silica-zirconia (SiZr-PCH), the Cu-Ce active phase was loaded by incipient wet impregnation setting the cerium amount constant (20 wt%) and investigating three different copper loadings (3, 6 and 12 wt%). The use of pillars of silica or silica-zirconia inserted in the interlayer space of a natural clay provides a high surface area support that can favor the dispersion of both CuO and CeO 2 active phases, leading to the formation of a high amount of copper-ceria interfacial sites, responsible for a very high catalytic activity in the CO-PROX reaction.The results obtained from characterization of the materials by XRD, N 2 physisorption, H 2 -TPR, XPS and CO 2 -TPD suggest that this synthesis method gives rise to catalysts with copper species highly active and selective for the CO-PROX reaction.The catalysts exhibit high CO conversion values and the sample with 6 wt% of copper on Si-PCH displays very good performances, comparable to those based on precious metal catalysts, even at low temperatures.The system reducibility was found modified by the incorporation of zirconium in the support, with a slight decrement of the CO conversion value, compared to the same material without Zr. The influence of the presence of CO 2 and H 2 O in the gas feed was also studied in order to simulate the real operating conditions of a PEMFC feed stream. Correlations between catalytic performances and physicochemical properties of the materials have been made.

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“…The presence of zirconium in the support provokes an increasing of the Ce 3+ /Ce 4+ ratio on the surface of the catalyst that suggests that zirconium favors the presence of Ce 3+ [27].…”

Section: Xpsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CuO-CeO2 supported on montmorillonite-derived porous clay heterostructures (PCH) for preferential CO oxidation in H2-rich stream

et al. 2015

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“…TPR profile of CeCu exhibits three main reduction peaks at 130, 160, and 840 • C. The two low-temperature signals can be assigned to the reduction of CuO x species and surface Ce 4+ . It is well known that bulk CuO reduction takes place at around 315-380 • C [20,67,68] while in our material a shift to lower temperature of the CuO x reduction Catalysts 2017, 7, 28 5 of 13 features occurs due to metal support interaction. In addition, we can observe that the low reduction signal of ceria at around 525 • C is not present, indicating that the hydrogen spillover process promotes surface ceria reduction at a much lower temperature [67,70].…”

Section: Reduction Behaviourmentioning

confidence: 50%

“…The addition of Cu on ceria modifies the redox properties of both species, as a consequence of the CuO-CeO2 interaction at the oxide interface [59,[67][68][69]. TPR profile of CeCu exhibits three main reduction peaks at 130, 160, and 840 °C.…”

Section: Reduction Behaviourmentioning

confidence: 99%

The Effect of Sr Addition in Cu- and Fe-Modified CeO2 and ZrO2 Soot Combustion Catalysts

Rico-Pérez¹,

Aneggi²,

Trovarelli³

2017

Catalysts

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This study investigates the activity of transition and alkaline-earth metal-doped catalysts supported on ceria or zirconia for the NO x -assisted oxidation of diesel particulate. A series of Cu-and Fe-impregnated catalysts over CeO 2 and ZrO 2 supports were prepared by incipient wetness impregnation and characterized by BET, X-ray diffraction (XRD), and temperature-programmed reduction (TPR) experiments while their catalytic activity was investigated in NO x -assisted reaction by means of temperature programmed oxidation experiments (TPO). Higher activity was achieved by copper modified catalysts; the addition of Sr positively affected the performance of the materials, suggesting a synergic effect between transition metals and alkaline-earth metal. The role of copper is correlated to the oxidation of NO to NO 2 , while strontium seems to be mainly involved in the storage of NO x species.

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Preferential CO Oxidation on a Highly Active Cu Single Atom Catalyst Supported by Ce−TiO_x

et al. 2022

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A heterogeneous single-atom catalyst (SAC) based on a tiny Cu loading (0.05 wt.%) supported on CeO 2 À TiO 2 (Ce/Ti = 0.18) shows very high Cu mass-normalized CO oxidation activity, 100 % selectivity for CO 2 between 60 and 100 °C and essentially no deactivation during 17 h on stream in the preferential oxidation of CO (PROX) at 120 °C. Based on state of the art, this catalyst is among the most active and PROX-selective catalysts. Employing a combination of ex-situ and operando methods, we infer that the isolated Cu single sites are incorporated with redox-active Cu 2 + À OÀ Ce 4 + .Cu + À &À Ce 3 + moieties connected by labile oxygen and are exposed on the surface of highly dispersed ceria. This high dispersion is promoted by TiO 2 which itself does not participate in redox steps during PROX, as Ti ions remain essentially tetravalent while Cu and Ce undergo reversible redox shuttles.

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Comparative study of CuO supported on CeO2, Ce0.8Zr0.2O2 and Ce0.8Al0.2O2 based catalysts in the CO-PROX reaction

Cited by 41 publications

References 18 publications

CuO-CeO2 supported on montmorillonite-derived porous clay heterostructures (PCH) for preferential CO oxidation in H2-rich stream

CuO-CeO2 supported on montmorillonite-derived porous clay heterostructures (PCH) for preferential CO oxidation in H2-rich stream

The Effect of Sr Addition in Cu- and Fe-Modified CeO2 and ZrO2 Soot Combustion Catalysts

Preferential CO Oxidation on a Highly Active Cu Single Atom Catalyst Supported by Ce−TiO_x

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Comparative study of CuO supported on CeO2, Ce0.8Zr0.2O2 and Ce0.8Al0.2O2 based catalysts in the CO-PROX reaction

Cited by 41 publications

References 18 publications

CuO-CeO2 supported on montmorillonite-derived porous clay heterostructures (PCH) for preferential CO oxidation in H2-rich stream

CuO-CeO2 supported on montmorillonite-derived porous clay heterostructures (PCH) for preferential CO oxidation in H2-rich stream

The Effect of Sr Addition in Cu- and Fe-Modified CeO2 and ZrO2 Soot Combustion Catalysts

Preferential CO Oxidation on a Highly Active Cu Single Atom Catalyst Supported by Ce−TiOx

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Preferential CO Oxidation on a Highly Active Cu Single Atom Catalyst Supported by Ce−TiO_x