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Salasc, S.; Perrichon, V.; Primet, Michel; Chevrier, M.; Mouaddib-Moral, N.

doi:10.1023/a:1016678730268

Cited by 12 publications

(22 citation statements)

References 8 publications

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“…It has been found that H 2 chemisorption at 191 K [27] and CO chemisorption at 195 K [28,29] can be used as al-ternative methods to measure the metal dispersion on ceria. Salasc et al [30] reported that the ceria surface in contact with the precious metals could be determined by successive O 2 /H 2 /O 2 chemisorption measurements performed over Pt/CeO 2 catalysts at room temperature, which is consistent to the results obtained for H 2 /O 2 titration and CO pulse adsorption. In this work, the Pd dispersion on Ce-containing catalysts was determined in similar ways.…”

Section: Pd Dispersionsupporting

confidence: 75%

Low-temperature oxidation of CO over Pd/CeO2–TiO2 catalysts with different pretreatments

Zhu

Qin

Shan

et al. 2005

Journal of Catalysis

145

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Section: Pd Dispersionsupporting

confidence: 75%

Low-temperature oxidation of CO over Pd/CeO2–TiO2 catalysts with different pretreatments

Zhu

Qin

Shan

et al. 2005

Journal of Catalysis

145

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“…Reducibility of Ni is facilitated if supported on CeO 2 or Ce–Zr oxide 14. 36 The uptake of H 2 at a relatively low temperature (onset at 125 °C) is attributed to the spillover of H 2 on the support 37–38. This phenomenon requires the presence of a metal to activate H 2 37.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Ce–Zr Oxide‐Supported Ni Catalysts in the Steam Reforming of meta‐Cresol as a Model Component for Bio‐Derived Tar

et al. 2014

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Phenols are major components in the tar vapours formed during gasification of biomass‐based feedstocks. The steam reforming of m‐cresol was demonstrated for tar removal and H2 production in this study. Ceria–zirconia based catalysts containing nickel were developed and investigated by using multiple characterisation techniques such as X‐ray diffraction, Raman spectroscopy, X‐ray photoelectron spectroscopy, and temperature‐programmed reduction and oxidation. These catalysts show high activity and excellent stability for producing hydrogen. The influence of the preparation method for the support on the catalyst performance was studied. Ni deposited on a hydrothermally prepared Ce–Zr solid solution was shown to be the most promising catalyst because of its excellent anti‐coking properties resulting from its high oxygen mobility. Insight into the steam‐reforming reactions was gained by in situ FTIR spectroscopy. The IR results reveal different geometries of adsorbed m‐cresol on the different supports. It also indicates that multiple sites (Ni and Ce) on the catalysts are involved in the reactions.

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“…A number of publications has been devoted to ceria containing catalysts investigating chemisorptive [27,28], structural [29,30] and catalytic properties [18,31]. Adsorption of CO on ceria supported catalysts leads to accumulation of different carboxylate, carbonate and formate species on the ceria surface as revealed from infrared spectroscopic studies [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Preferential CO oxidation in hydrogen (PROX) on ceria-supported catalysts, part I: Oxidation state and surface species on Pt/CeO2 under reaction conditions

Pozdnyakova

Teschner

Wootsch

et al. 2006

Journal of Catalysis

384

245

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The CO content of hydrogen feed to proton exchange membrane fuel cells (PEMFC) must be kept under 1-100 ppm for their proper operation. This can be achieved by using catalysts able to selectively oxidize CO in the presence of excess hydrogen (PROX). The present study reports on the mechanism of PROX reaction on Pt/CeO 2 catalyst, by using catalytic tests, in-situ DRIFTS, high-pressure XPS, HRTEM and TDS techniques. Bulk metallic, pronounced adsorbate-induced surface Pt and a small amount of oxidized Pt sites were detected by in-situ, high pressure XPS under PROX conditions. The pre-oxidized ceria surface was strongly reduced in pure H 2 but significantly re-oxidized under PROX conditions (i.e. O 2 +CO in excess hydrogen) at T=358 K. The remaining small amount of Ce 3+ decreased with increasing temperature. HRTEM found well-crystallized CeO 2 particles (8-10 nm) in the case of activated (pre-oxidized) sample that transformed in a large extent to an oxygen deficient ceria super-cell structure after PROX reaction. Metallic Pt particles (2-3 nm) and small (0.5-0.6 nm) Pt clusters were found by HRTEM. These findings were in accordance with the variations in relative intensity of the corresponding Pt-CO bands (DRIFTS). Different types of carbonate and formate species were detected (XPS and DRIFTS). Their possible role in the reaction mechanism is discussed. Resolved OH bands could not be found by DRIFT in the PROX reaction mixture indicating significant amount of adsorbed water in a hydrogen-bonded structure. Its presence seems to suppress hydrogen oxidation while CO oxidation still takes place, as the metallic particles are covered by CO (DRIFTS). The direct contribution of surface water in a low-temperature water-gas-shift (LTWGS) type reaction in the PROX mixture is proposed.

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Untitled

Cited by 12 publications

References 8 publications

Low-temperature oxidation of CO over Pd/CeO2–TiO2 catalysts with different pretreatments

Low-temperature oxidation of CO over Pd/CeO2–TiO2 catalysts with different pretreatments

Investigation of Ce–Zr Oxide‐Supported Ni Catalysts in the Steam Reforming of meta‐Cresol as a Model Component for Bio‐Derived Tar

Preferential CO oxidation in hydrogen (PROX) on ceria-supported catalysts, part I: Oxidation state and surface species on Pt/CeO2 under reaction conditions

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