CO preferential oxidation on cordierite monoliths coated with Co/CeO2 catalysts

Gómez, Leticia Ester; Tiscornia, Inés; Boix, Alicia Viviana; Miró, Eduardo Ernesto

doi:10.1016/j.ijhydene.2012.01.159

Cited by 37 publications

(23 citation statements)

References 23 publications

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“…Figure 9(a) shows the XPS spectra for Co 2p in 5 wt.% Co 3 O 4 /CeO 2 prepared by calcining the spontaneous combusted precursor at temperatures form 300 ∘ C to 500 ∘ C. The doublet peaks, corresponding to Co 2p 3/2 and a satellite peak, for all the samples, were found at 788.0 ± 0.3 and 782.6 eV in Co 2p scanning pattern, which indicates the generation of Co 3 O 4 on the surface of catalysts, which is in line with XRD analysis (Figure 8). Other researchers have reported that the satellite peak is absent in the diamagnetic Co 3+ compound [39,40]; however, it grows along with the increase of calcination temperature, which indicates the transformation of Co 3+ to Co 2+ species [41]. Whereas the binding energies of Co 2p 3/2 and the satellite peak are slightly higher than the reported binding energies at ∼780.0 and ∼786.0 eV [41][42][43], respectively, this shift toward higher energies may be caused by the conjunction with Ce orbits.…”

Section: Effects Of Calcinationmentioning

confidence: 90%

“…Other researchers have reported that the satellite peak is absent in the diamagnetic Co 3+ compound [39,40]; however, it grows along with the increase of calcination temperature, which indicates the transformation of Co 3+ to Co 2+ species [41]. Whereas the binding energies of Co 2p 3/2 and the satellite peak are slightly higher than the reported binding energies at ∼780.0 and ∼786.0 eV [41][42][43], respectively, this shift toward higher energies may be caused by the conjunction with Ce orbits. Binding energies of Co 3s and Ce 4d have been shown in Figure 9(b) to present the connection between Co and Ce orbits.…”

Section: Effects Of Calcinationmentioning

confidence: 90%

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Enhanced Photoreduction Activity of Carbon Dioxide over Co₃O₄/CeO₂Catalysts under Visible Light Irradiation

Zhang

Yan

Guo

et al. 2015

International Journal of Photoenergy

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A series of new two semiconductor catalysts, Co3O4/CeO2, were prepared by glycine-nitrate combustion method for photocatalytic reduction of carbon dioxide to produce methanol and ethanol under visible light (λ>400 nm) irradiation. The catalysts were characterized by BET, UV-vis spectra, XRD, SEM, PL, and XPS and the results indicated that the catalyst with 5 wt.% of Co3O4has the highest yield among all kinds of tests with the methanol yield of 1.52 μmol·g−1·h−1and the ethanol yield of 4.75 μmol·g−1·h−1, which are about 2.34 and 1.71 times as large as those of CeO2. However, methanol and ethanol can hardly be detected for Co3O4under the same condition because of its too narrow band gap. The improvement of the photoreduction activity of Co3O4doped CeO2was caused by the separation of electron-hole pairs of Co3O4/CeO2and charge transfer between Co3O4and CeO2, mimicking the Z-scheme in photosynthesis.

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Section: Effects Of Calcinationmentioning

confidence: 90%

Section: Effects Of Calcinationmentioning

confidence: 90%

Enhanced Photoreduction Activity of Carbon Dioxide over Co₃O₄/CeO₂Catalysts under Visible Light Irradiation

Zhang

Yan

Guo

et al. 2015

International Journal of Photoenergy

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“…[36][37][38][39][40][41][42] In order to study the morphology of the catalyst anchored to the DPF walls, Scanning Electron Microscopy (SEM) was performed in a HITACHI S-3000N microscope with a secondary electron detector, a retrodispersed electron detector and X-ray detector (XFlash 3001 from Bruker) for microanalysis and chemical mapping. Previous to SEM characterization, a bare and a coated lter were cut into different pieces to examine the inner channel walls and cross sections.…”

Section: Supported Catalyst Preparation Characterization and Testingmentioning

confidence: 99%

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot

2015

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This work presents a comparative study between the catalytic performance of the 2% CuO/ceria-zirconia powder catalyst and the same catalyst supported on silicon carbide DPF (Diesel Particulate Filter) towards NO oxidation reaction and soot combustion reaction. The ceria-zirconia catalyst was prepared by the coprecipitation method and 2 wt% copper was incorporated by the incipient wetness impregnation method. The catalyst was incorporated onto the ceramic support using a simple and organic solvent-free procedure by a simply dipping the DPF into an aqueous solution of the catalyst. The powder catalyst has been characterized using N 2 adsorption at À196 C, XRD and Raman Spectroscopy; whereas the catalytic coating morphology has been evaluated by SEM and the mechanical stability by an adherence test. Both catalyst configurations were tested for NO oxidation to NO 2 and for soot combustion under NO x /O 2 .The results revealed that incorporation of the very active copper/ceria-zirconia catalyst onto SiC-DPF has been successfully achieved by a simple coating procedure. Furthermore, the catalytic coating has shown suitable mechanical, chemical and thermal stability. A satisfactory catalytic performance of the catalytic-coated filter was reached towards the NO oxidation reaction. Moreover, it was proved that the catalytic coating is stable and the corresponding coated DPF can be reused for several cycles of NO oxidation without a significant decrease in its activity. Finally, it was verified that the loose-contact mode is a good choice to simulate the catalytic performance of this active phase in a real diesel particulate filter.

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“…In our research group, catalysts for the removal of contaminants from vehicles, industrial facilities, and power-generating sources have been studied [8,9]. In addition, catalysts and catalytic reactors have also been investigated for the production and purification of H 2 to be used in fuel cells [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Cordierite offers high mechanical strength, high resistance to elevated temperatures, and temperature shocks due to its low thermal expansion coefficient. Moreover, it presents great adhesion stability, which is a very important property for the monolithic catalysts [12,13,15,16].…”

Section: Introductionmentioning

confidence: 99%

Cobalt-Based Catalysts for CO Preferential Oxidation

Gómez¹,

Boix²

2019

Cobalt Compounds and Applications

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In this work, catalysts based on cobalt supported on ZrO 2 and CeO 2 and CoCeMnOx were studied for the CO preferential oxidation (COPrOx) in hydrogenrich stream able to feed fuel cells. Among them, the CoCeMnOx formulation showed the highest CO conversion at low temperatures, while the cobalt oxide supported on ceria presented the best selectivity toward CO 2. The Co 3 O 4 spinel was the active phase for the CO preferential oxidation detected in all catalysts. However, the CoOx-CeO 2 and CoCeMnOx catalysts resulted more active than cobalt oxide supported on zirconia. The presence of ceria close to cobalt species promotes the redox properties and enhances the catalytic activity. In the CoCeMnOx catalyst prepared by coprecipitation, the incorporation of Mn represented an additional positive effect. The presence of Mn promoted the reoxidation of Co 2+ to Co 3+ and, consequently, the activity increased at low temperature. By X-ray diffraction (XRD) of CoOx-ZrO 2 and the CoOx-CeO 2 catalysts, the Co 3 O 4 spinel and ZrO 2 or CeO 2 were identified in agreement with laser-Raman spectra. At the same time, the CoCeMnOx catalyst, prepared by coprecipitation of precursor salts, showed an incipient development of a new phase (Mn,Co) 3 O 4 mixed spinel, due to the intimate contact between elements.

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CO preferential oxidation on cordierite monoliths coated with Co/CeO2 catalysts

Cited by 37 publications

References 23 publications

Enhanced Photoreduction Activity of Carbon Dioxide over Co₃O₄/CeO₂Catalysts under Visible Light Irradiation

Enhanced Photoreduction Activity of Carbon Dioxide over Co₃O₄/CeO₂Catalysts under Visible Light Irradiation

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot

Cobalt-Based Catalysts for CO Preferential Oxidation

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CO preferential oxidation on cordierite monoliths coated with Co/CeO2 catalysts

Cited by 37 publications

References 23 publications

Enhanced Photoreduction Activity of Carbon Dioxide over Co3O4/CeO2Catalysts under Visible Light Irradiation

Enhanced Photoreduction Activity of Carbon Dioxide over Co3O4/CeO2Catalysts under Visible Light Irradiation

Catalytic performance of CuO/Ce0.8Zr0.2O2 loaded onto SiC-DPF in NOx-assisted combustion of diesel soot

Cobalt-Based Catalysts for CO Preferential Oxidation

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Product

Resources

About

Enhanced Photoreduction Activity of Carbon Dioxide over Co₃O₄/CeO₂Catalysts under Visible Light Irradiation

Enhanced Photoreduction Activity of Carbon Dioxide over Co₃O₄/CeO₂Catalysts under Visible Light Irradiation

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot