Preferential CO oxidation over nanosized gold catalysts supported on ceria and amorphous ceria–alumina

Fonseca, Juliana da Silva; Royer, Sébastien; Bion, Nicolas; Piraúlt-Roy, Laurence; Rangel, María do Carmo; Duprez, Daniel; Epron, Florence

doi:10.1016/j.apcatb.2012.03.037

Cited by 50 publications

(33 citation statements)

References 47 publications

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“…2b, d), indicating that Au favored the multiple exchange. The promotion of the multiple hetero-exchange mechanism by gold when supported on Ce-doped ordered mesoporous alumina materials has already been reported by Fonseca et al [34]. Taking into account that the multiple exchange must involve binuclear oxygen species as intermediate, it can be inferred from Fig.…”

Section: Resultsmentioning

confidence: 80%

Understanding of the oxygen activation on ceria- and ceria/alumina-supported gold catalysts: a study combining 18O/16O isotopic exchange and EPR spectroscopy

et al. 2013

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Gold supported on ceria or ceria-alumina mixed oxides are very active catalysts for total oxidation of a variety of molecules. The key step of the oxygen activation on such catalysts is still a matter of debate. Gold-ceria (Au/CeO 2 ) and gold-ceria-alumina (Au/CeO 2 /Al 2 O 3 ) catalysts were prepared by deposition-precipitation of gold precursor with urea as in former works where their efficiency to catalyze the oxidation of propene and propan-2-ol was demonstrated. To understand the phenomenon of oxygen activation over this class of catalysts, efficient techniques generally used to characterize the interaction between oxygen and cerium-based oxides were applied; the oxygen storage capacity (OSC) measurement, the O (g) ), indicating that gold did not promote the dissociation of dioxygen. Peroxo adspecies were observed by Raman spectroscopy only in the presence of gold. On the contrary, EPR spectroscopy indicated that the concentration of superoxo adspecies was lower for oxide-supported gold samples than for bare oxides. The combination of techniques allowed reinforcing the hypothesis that the gold nanoparticules promote the activation of dioxygen by generating extremely mobile diatomicoxygenated species at the gold/ceria interfacial perimeter. This specific gold-ceria interaction, which leads to the increase in oxygen mobility, is probably also responsible for the higher catalytic performance of Au/CeO 2 and Au/CeO 2 /Al 2 O 3 in oxidation reaction compared to bare supports.

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Section: Resultsmentioning

confidence: 80%

Understanding of the oxygen activation on ceria- and ceria/alumina-supported gold catalysts: a study combining 18O/16O isotopic exchange and EPR spectroscopy

et al. 2013

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“…The performance of the catalysts for the oxidation of CO has been investigated evaluating the Both solids achieve complete CO TOX conversion, although the gold catalyst allows reaching it at lower temperature (89 °C) thus evidencing that the CO oxidation ability of doped-ceria systems is enhanced by the deposition of small loadings of gold [14,24,69,70]. Since the AuCeCu sample presents a lower reducibility than the CeCu one (Figure 3), its higher activity cannot be related with this factor.…”

Section: Catalytic Performance and Kinetic Modelmentioning

confidence: 99%

Gold supported on CuOx/CeO2 catalyst for the purification of hydrogen by the CO preferential oxidation reaction (PROX)

Laguna

Hernández

Arzamendi

et al. 2014

Fuel

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Hydrogen produced from the conversion of hydrocarbons or alcohols contains variable amounts of CO that should be removed for some applications such as feeding lowtemperature polymer electrolyte membrane fuel cells (PEMFCs). The CO preferential oxidation reaction (PROX) is particularly well-suited for hydrogen purification for portable and on-board applications. In this work, the synthesis and characterization by XRF, BET, XRD, Raman spectroscopy and H 2 -TPR of a gold catalyst supported on a copper-cerium mixed oxide (AuCeCu) for the PROX reaction are presented. The comparison of this catalyst with the copper-cerium mixed oxide (CeCu) revealed that the experimental procedure used for the deposition of gold gave rise to the loss of reducible material by copper lixiviation. However, the AuCeCu solid was more active for CO oxidation at low temperature. A kinetic study has been carried over the AuCeCu catalyst for the PROX reaction and compared with that of the CeCu catalyst. The main difference between the models affected the contribution of the CO adsorption term. This fact may be related to the surface electronic activity produced by the interaction of the cationic species in the AuCeCu solid, able to create more active sites for the CO adsorption and activation in the presence of gold.

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“…Fonseca et al [37] studied CO oxidation over CeO 2 -Al 2 O 3 -supported Au catalysts and reported that the activity of Au/CeO 2 -Al 2 O 3 catalysts increased with the increase in Ce content, which was due to the higher oxygen mobility of supports. In addition, the oxygen storage capacity and the oxygen mobility over Au/CeO 2 -Al 2 O 3 catalysts were higher than those of the Au/CeO 2 catalysts.…”

Section: Deactivation Analysismentioning

confidence: 97%

One‐pot Synthesis of Ordered Mesoporous NiCeAl Oxide Catalysts and a Study of Their Performance in Methane Dry Reforming

Wang

Deng

et al. 2014

ChemCatChem

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Ordered mesoporous NiAl and NiCeAl catalysts with different Ce/Al molar ratios were facilely synthesized by using the improved evaporation‐induced self‐assembly method. The characterization results confirmed that the ordered mesoporous structure was well sustained in the Ce‐incorporated NiAl materials (Ce/Al molar ratio<4 %). Compared with NiAl mesoporous materials, Ce‐incorporated mesoporous materials demonstrated higher specific surface areas, larger pore volumes, and more uniform pore sizes. The catalytic test conducted by using methane dry reforming revealed that compared with NiAl catalysts, all the Ce‐promoted catalysts demonstrated improved initial catalytic activity, which was due to the high dispersion and the high reduction degree of active Ni species in NiCeAl catalysts. The stable alumina framework, confinement effect of ordered mesopores, and high oxygen mobility contributed to the improved catalytic stability of NiCeAl catalysts. For comparison, the mesoporous NiCeAl catalyst (denoted as NiCeAl‐IMP) was also prepared by using the conventional impregnation method. The agglomeration of Ni particles was observed during the stability test for the Ni‐impregnated catalyst, which accelerated the rate of carbon deposition. The NiCeAl catalyst (Ce/Al molar ratio=1 %) demonstrated excellent resistance to the formation of graphitic carbon species owing to the redox property, while a large amount of graphitic carbon species was deposited over the NiAl sample, which was responsible for deactivation.

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Preferential CO oxidation over nanosized gold catalysts supported on ceria and amorphous ceria–alumina

Cited by 50 publications

References 47 publications

Understanding of the oxygen activation on ceria- and ceria/alumina-supported gold catalysts: a study combining 18O/16O isotopic exchange and EPR spectroscopy

Understanding of the oxygen activation on ceria- and ceria/alumina-supported gold catalysts: a study combining 18O/16O isotopic exchange and EPR spectroscopy

Gold supported on CuOx/CeO2 catalyst for the purification of hydrogen by the CO preferential oxidation reaction (PROX)

One‐pot Synthesis of Ordered Mesoporous NiCeAl Oxide Catalysts and a Study of Their Performance in Methane Dry Reforming

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