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Sadi, F.; Duprez, Daniel; Gérard, François; Rossignol, Sylvie; Miloudi, A.

doi:10.1023/a:1018941512268

Cited by 40 publications

(51 citation statements)

References 20 publications

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“…Such wetting behavior has also been observed in the formation of other metal-silicide islands. 23,24 In summary, strong evidence was found for silicide formation from the reaction of a SiO 2 substrate with fairly strong attached Cu particles after annealing in UHV up to 620°C. The initial metal-support interaction and the wetting behavior of the silicide islands are of importance to facilitate the reaction between Cu and SiO 2 .…”

Section: Fig 2 Aes Results Of Amentioning

confidence: 94%

Reaction of nanometer-sized Cu particles with a SiO2 substrate

Oetelaar

Partridge

et al. 1999

Applied Physics Letters

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Section: Fig 2 Aes Results Of Amentioning

confidence: 94%

Reaction of nanometer-sized Cu particles with a SiO2 substrate

Oetelaar

Partridge

et al. 1999

Applied Physics Letters

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“…[32,33] As mentioned above, it is generally accepted that one surface oxygen atom out of four is involved in the redox process shown in Equation (2), which represents a theoretical OSC value of 5.4 mmol O m À2 for a mean surface density of 13.1 mmol O m À2 . [22,33] Reduced ceria is able to dissociate water [34][35][36][37][38] or carbon dioxide [34,36] according to Equation (4) or the reverse of Equation (2) Ceria also possesses versatile acid-base properties, depending on the nature and temperature of the pretreatment. Ceria can chemisorb pyrrole, a proton donor, and CO 2 , an electron acceptor, which is characteristic of strong Lewis-base sites.…”

Section: Introductionmentioning

confidence: 99%

Ceria‐Based Solid Catalysts for Organic Chemistry

Vivier¹,

Duprez²

2010

ChemSusChem

357

244

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Ceria has been the subject of thorough investigations, mainly because of its use as an active component of catalytic converters for the treatment of exhaust gases. However, ceria‐based catalysts have also been developed for different applications in organic chemistry. The redox and acid–base properties of ceria, either alone or in the presence of transition metals, are important parameters that allow to activate complex organic molecules and to selectively orient their transformation. Pure ceria is used in several organic reactions, such as the dehydration of alcohols, the alkylation of aromatic compounds, ketone formation, and aldolization, and in redox reactions. Ceria‐supported metal catalysts allow the hydrogenation of many unsaturated compounds. They can also be used for coupling or ring‐opening reactions. Cerium atoms can be added as dopants to catalytic system or impregnated onto zeolites and mesoporous catalyst materials to improve their performances. This Review demonstrates that the exceptional surface (and sometimes bulk) properties of ceria make cerium‐based catalysts very effective for a broad range of organic reactions.

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“…In addition, Ni is known to participate in the water-gas shift (WGS) reactions to convert CO into CO 2 [19]. Redox supports such as CeO 2 are known to enhance the reducibility and the dispersion of the supported metal in addition to their role in WGS reactions [20]. Thus, it is anticipated that catalysts containing Ni with small amount of Rh supported on CeO 2 will offer a new catalyst for the efficient reforming of ethanol to H 2 -rich gas with low selectivity towards undesirable byproducts such as CH 3 CHO, CH 4 , CO, etc.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature reforming of ethanol over CeO2-supported Ni-Rh bimetallic catalysts for hydrogen production

2005

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A new series of Ni-Rh bimetallic catalysts with different Ni and Rh loadings on a high-surface-area CeO 2 was developed for the reforming of bio-ethanol at low-temperature (below 450°C) to produce H 2 -rich gas for on-site or on-board fuel cell applications. Oxidative steam reforming of ethanol (OSRE) over a Ni-Rh=CeO 2 catalyst containing 5 wt% Ni and 1 wt% Rh was found to be more efficient offering about 100% ethanol conversion at 375°C with high H 2 and CO 2 selectivity and low CO selectivity compared to the steam reforming of ethanol (SRE) reaction which required a higher temperature of about 450°C to achieve 100% ethanol conversion. The high temperature SRE reaction favors the formation of large amount of CO, which would make the downsteam CO cleanup more complicated for polymer electrolyte membrane fuel cell (PEMFC). The presence of O 2 in the feed gas was found to greatly enhance the conversion of ethanol to produce H 2 and CO 2 as major products. Increase in Ni content above 5 wt% in the catalyst formulation decreased the H 2 selectivity while the selectivity of undesirable CH 4 and acetaldehyde increased. The 1 wt% Rh/CeO 2 catalyst was twice as active as 10 wt% Ni/CeO 2 catalyst in terms of ethanol conversion and acetaldehyde selectivity and this indicated that Rh was more effective in C-C bond cleavage than Ni. The reaction was found to proceed through the formation of acetaldehyde intermediate, which subsequently underwent decomposition to produce a mixture of CO and CH 4 or reforming with H 2 O and O 2 to produce CO, CO 2 and H 2 . The role of Rh is mainly to cleave the C-C and C-H bonds of ethanol to produce H 2 and COx while Ni addition helps converting CO into CO 2 and H 2 by WGS reaction under the conditions employed.

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Cited by 40 publications

References 20 publications

Reaction of nanometer-sized Cu particles with a SiO2 substrate

Reaction of nanometer-sized Cu particles with a SiO2 substrate

Ceria‐Based Solid Catalysts for Organic Chemistry

Low-temperature reforming of ethanol over CeO2-supported Ni-Rh bimetallic catalysts for hydrogen production

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