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Martı́nez-Arias, A.; Fernández, M.; Belver, Carolina; Conesa, J.C.; Soria, J.

doi:10.1023/a:1019089910238

Cited by 133 publications

(164 citation statements)

References 21 publications

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“…This behavior generates a synergistic effect between copper oxide clusters and ceria, where Cu + species are stabilized providing surface sites for CO adsorption, while cerium oxide provides oxygen vacancies. 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].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Recently, a considerable number of studies have explored the catalytic properties of silver catalysts for the selective catalytic reduction of NO x by hydrocarbons [9][10][11][12][13][14][15][16][17] . Different states of silver are supposed to behave differently in cataly-sis.…”

Section: Introductionmentioning

confidence: 99%

“…It is generally believed that highly dispersed silver ions strongly interacting with the supports are effective for the reaction [9][10][11][12]. While point of views on the catalytic roles of the aggregated silver entities in the SCR reaction are still conflicted [13,14]. Our recent studies show that the formation of nano-silver particles on the outer surface of the zeolite accelerates the SCR reaction apparently, they provide much stronger adsorption centers for NO x , on which adsorbed NO x can be effectively reduced by the activated methane [17,18].…”

Section: Introductionmentioning

confidence: 99%

On the correlation between microstructural changes of Ag-H-ZSM-5 catalysts and their catalytic performances in the selective catalytic reduction of NOx by methane

Shi

Cheng

et al. 2005

Journal of Molecular Catalysis A: Chemical

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“…The establishment of intimate contact between CuO and CeO2 generates a synergic effect that increases the catalytic activity, in which Cu + species are stabilized by interaction between cooper oxide clusters and cerium oxide providing surface sites for easy CO adsorption [23].…”

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confidence: 99%

The influence of promoters (Zr, La, Tb, Pr) on the catalytic performance of CuO-CeO2 systems for the preferential oxidation of CO in the presence of CO2 and H2O

et al. 2015

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CuO supported on CeO2 and Ce0.9X0.1O2, where X is Zr, La, Tb or Pr, were synthesized using nitrate precursors, giving rise ceria based materials with a small particle size which interact with CuO species generating a high amount of interfacial sites. The incorporation of cations to the ceria framework modifies the CeO2 lattice parameter, improving the redox behavior of the catalytic system. The catalysts were characterized by X-ray Diffraction (XRD), High-resolution Transmission Electron Microscopy (HRTEM), Raman spectroscopy, thermoprogrammed reduction with H2 (H2-TPR) and X-ray photoelectron spectroscopy (XPS). The catalysts were tested in the preferential oxidation of CO under a H2-rich stream (CO-PROX), reaching conversion values higher than 95% between 115-140 ºC and being the catalyst with 6 wt.% of Cu supported on Ce0.9Zr0.1O2 (sample 6CUZRCE) the most active catalyst. The influence of the presence of CO2 and H2O was also studied simulating a PROX unit, taking place a decreasing of the catalytic activity due to the inhibitor effect both CO2 and H2O.

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Cited by 133 publications

References 21 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

On the correlation between microstructural changes of Ag-H-ZSM-5 catalysts and their catalytic performances in the selective catalytic reduction of NOx by methane

The influence of promoters (Zr, La, Tb, Pr) on the catalytic performance of CuO-CeO2 systems for the preferential oxidation of CO in the presence of CO2 and H2O

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