CuO/CeO2 supported on Zr doped SBA-15 as catalysts for preferential CO oxidation (CO-PROX)

Reyes-Carmona, Álvaro; Arango-Díaz, A.; Moretti, Elisa; Talon, Aldo; Storaro, Loretta; Lenarda, Maurizio; Jiménez‐López, Antonio; Rodríguez‐Castellón, Enrique

doi:10.1016/j.jpowsour.2010.10.019

Cited by 55 publications

(32 citation statements)

References 31 publications

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“…The excess oxygen factor ( ) used was 2 because this value was previously found optimal for CO-PROX [29,50].…”

Section: Catalytic Testsmentioning

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%

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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 excess oxygen factor ( ) used was 2 because this value was previously found optimal for CO-PROX [29,50].…”

Section: Catalytic Testsmentioning

confidence: 99%

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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“…The loading of copper was 6 wt.% and cerium was 20 wt.%. These amounts were found as optimal in previous works (Moretti et al 2009;Reyes-Carmona et al 2010). Due to the limited solubility of the salts, the impregnation was carried out in several steps until the total incorporation of the salts.…”

Section: Co-prox Catalystmentioning

confidence: 51%

“…O 1s region can be composed by two contributions, one at 529.8 eV, assigned to CeO 2 and another one at 532.2 eV from the remaining superficial oxides (CuO and ZrO 2 , if present). It showed a reduction of Cu and Ce species in the catalyst after the reaction, being lower for the catalyst (Moretti et al 2008;Reyes-Carmona et al 2010). First one, at lower binding energy, assigned to partially reduced Cu species interacting strongly with ceria particles and another at high energy assigned to bulk CuO.…”

Section: X-ray Photoelectronic Spectroscopymentioning

confidence: 95%

“…Finally, a shift in the O 1s signal to a lower binding energy (532.0 eV) was observed, probably due to the presence of sulfate species over the surface of the materials. Some interesting information can be obtained from the study of Cu 2p and Ce 3d regions, using the methodology of our recent works (Moretti et al 2009;Reyes-Carmona et al 2010). Data of binding energies and redox properties are collected in Table 4.…”

Section: X-ray Photoelectronic Spectroscopymentioning

confidence: 99%

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Preparation, characterization and catalytic applications of ZrO2 supported on low cost SBA-15

et al. 2011

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This work presents some applications of ZrO 2 supported over SBA-15 silica as promoter of sulfated zirconia and as support from CuO/CeO 2 catalytic system for preferential oxidation of CO to CO 2 in hydrogen rich streams, used as feed for proton exchange membrane fuel cells (PEMFC). Different amounts of ZrO 2 , from 10 to 30 wt.% were incorporated. These prepared materials were characterized by powder XRD, adsorption-desorption of N 2 at 77 K, transmission and scanning electron microscopy (TEM and SEM) and X-rays photoelectron spectroscopy (XPS). The acidity was studied by thermo-programmed desorption of ammonia (NH 3 -TPD). These materials were tested, after treatment with H 2 SO 4 , by 2-propanol dehydration and 1-butene isomerization catalytic tests. The samples were found quite good catalyst with strong acid sites, the sample with 20 wt.% of ZrO 2 being the better performing sample. Finally this material was successfully used as support for a CuO/CeO 2 system, with 6 wt.% of Cu and 20 wt.% of Ce. The resulting catalyst was tested in the preferential oxidation of CO (CO-PROX) attaining conversions close to 100% and high selectivity to CO 2 .

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Cobalt‐Doped K‐OMS‐2 Nanofibers: A Novel and Efficient Water‐Tolerant Catalyst for the Oxidation of Carbon Monoxide

et al. 2017

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Cobalt-doped manganese octahedral molecular sieves with an ordered cryptomelanes tructure (OMS-2) were synthesized by ao ne-step hydrothermalm ethod. The cobalt precursor was directly added into the solution before crystallization to allow its incorporation into the mixed-valent framework of K-OMS-2. The structure, redox properties, and surface hydrophobicity of Co-doped K-OMS-2 were examined by X-ray diffraction, FTIR spectroscopy,R amans pectroscopy,S EM,T EM, N 2 sorption, temperature-programmed reduction by H 2 ,X -ray photoelectron spectroscopy,a nd water contact-angle system. The incorporation of Co induced am orphological change in K-OMS-2 from nanorods to nanofibers and an increase in the specific surfacea rea from 70.6 to 188.3 m 2 g À1 .C o-doped K-OMS-2 was shown to be able to completely convert CO at 100 8Ci nt he presenceo fa pproximately 3% water vapor.T he promotion effect of Co on the catalytic activity is believed to originate from the enhanced redox capacity and surfacea rea of K-OMS-2, whereas the improved surfaceh ydrophobicity may induce superiorw ater-tolerant performance.CatalyticC Oo xidation hasb een extensively investigated and has already been applied in the field of air purification,a utomotive exhaust cleaning, CO removal of cigarettes moke, and CO 2 lasers. [1] However,f or the above purposes, the presence of water vapor inevitably leads to catalystd eactivation through temporary poisoning of the exposed active sites. [2] Such strict operation conditions have thus stimulated an increase in the demandt od evelop highly efficient and water-tolerantc atalysts for CO oxidation. Noble-metal catalysts such as Pd, Pt, and Au have been widely recognized as preferred choices, but both high costs and finite resources limit their application. [3] Alternatively,aseries of cheap transition-metal oxides (i.e.,C uO,

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CuO/CeO2 supported on Zr doped SBA-15 as catalysts for preferential CO oxidation (CO-PROX)

Cited by 55 publications

References 31 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

Preparation, characterization and catalytic applications of ZrO2 supported on low cost SBA-15

Cobalt‐Doped K‐OMS‐2 Nanofibers: A Novel and Efficient Water‐Tolerant Catalyst for the Oxidation of Carbon Monoxide

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