Palladium-ceria catalysts: Metal-support interactions and reactivity of palladium in selective hydrogenation of but-1-yne

Bensalem, Abdelhamid; Verduraz, François Bozon

doi:10.1007/bf02477692

Cited by 13 publications

(4 citation statements)

References 18 publications

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“…Thus, Additionally, it is known that both ceria-and lanthana-supported catalysts exhibit metal f support hydrogen spillover effects even at room temperature. [20][21][22] One may therefore speculate that scavenging of hydrogen from the gold by the support acts to promote the above two reactions, but not the homocoupling of iodobenzene to produce biphenyl, in accord with observation.…”

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confidence: 58%

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Identity of the Active Site in Gold Nanoparticle-Catalyzed Sonogashira Coupling of Phenylacetylene and Iodobenzene

2010

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XPS, TEM, and reaction studies were used to examine the catalytic behavior of gold species deposited on lanthana toward the cross-coupling of phenylacetylene and iodobenzene. Atomically dispersed Au I and Au III were catalytically inert, whereas metallic Au 0 nanoparticles were both active and very selective. Thus it is metallic gold and not ionic gold that provides the catalytically active sites. Au 0 nanoparticles supported on silica, γ-alumina, and BaO were active but relatively unselective; however, as with lanthana, ceria-supported Au 0 nanoparticles showed high selectivity. This strong promoting effect of the lanthanide oxide supports on Sonogashira selectivity cannot be accounted for in terms of acid/base, redox, or SMSI effects; it may be tentatively ascribed to metal f support hydrogen spillover.

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confidence: 58%

“…[20][21][22] One may therefore speculate that scavenging of hydrogen from the gold by the support acts to promote the above two reactions, but not the homocoupling of iodobenzene to produce biphenyl, in accord with observation.…”

mentioning

confidence: 71%

Identity of the Active Site in Gold Nanoparticle-Catalyzed Sonogashira Coupling of Phenylacetylene and Iodobenzene

2010

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“…[16] In particular, Pd/CeO 2 catalysts are largely used in a variety of dehydrogenation and oxidation reactions. [17][18][19][20][21][22][23][24][25][26] One of the key functions of this material is the ability of Ce to switch between the Ce 4 + and Ce 3 + oxidation states, which allows the reversible addition and removal of oxygen, the socalled oxygen storage capacity (OSC). Previous studies have shown that the addition of CeO 2 to Pd/Al 2 O 3 promotes the oxidation of Pd.…”

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confidence: 99%

Energy Efficiency Enhancement of Ethanol Electrooxidation on Pd–CeO₂/C in Passive and Active Polymer Electrolyte‐Membrane Fuel Cells

et al. 2012

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Pd nanoparticles have been generated by performing an electroless procedure on a mixed ceria (CeO(2))/carbon black (Vulcan XC-72) support. The resulting material, Pd-CeO(2)/C, has been characterized by means of transmission electron microscopy (TEM), inductively coupled plasma atomic emission spectroscopy (ICP-AES), and X-ray diffraction (XRD) techniques. Electrodes coated with Pd-CeO(2)/C have been scrutinized for the oxidation of ethanol in alkaline media in half cells as well as in passive and active direct ethanol fuel cells (DEFCs). Membrane electrode assemblies have been fabricated using Pd-CeO(2)/C anodes, proprietary Fe-Co cathodes, and Tokuyama anion-exchange membranes. The monoplanar passive and active DEFCs have been fed with aqueous solutions of 10 wt% ethanol and 2 M KOH, supplying power densities as high as 66 mW cm(-2) at 25 °C and 140 mW cm(-2) at 80 °C. A comparison with a standard anode electrocatalyst containing Pd nanoparticles (Pd/C) has shown that, at even metal loading and experimental conditions, the energy released by the cells with the Pd-CeO(2)/C electrocatalyst is twice as much as that supplied by the cells with the Pd/C electrocatalyst. A cyclic voltammetry study has shown that the co-support ceria contributes to the remarkable decrease of the onset oxidation potential of ethanol. It is proposed that ceria promotes the formation at low potentials of species adsorbed on Pd, Pd(I)-OH(ads), that are responsible for ethanol oxidation.

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“…The esters were hydrogenated and compared with the initial products [12,13]. After hydrogenation of the double bonds in the ring, the TOS of esters XVII-XIX improved to some degree [14].…”

mentioning

confidence: 99%

Thermooxidative stability of cyclic polyhydric alcohol esters

Gurbanov¹,

Kuli-zade²,

Mamed’yarov³

2008

Chem Technol Fuels Oils

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stability was investigated. The characteristics established allow synthesizing the esters purposefully and selectively, which suggests them as the base and components for promising lube oils.One factor that determines the performance characteristics of lube oils is the thermooxidative stability, which is directly correlated with the chemical structure of their molecules [1][2][3].The thermooxidative stability (TOS) of lube oils of the ester type is primarily a function of the number and position of the ester groups, length and structure of acid and alcohol fragments, the type of functional groups or heteroatoms in the esters, and the type and conformational state of cyclic fragments and other factors.From this point of view, studying the dependence between the chemical structure and thermooxidative stability of cyclic neopolyols and cyclic norbornene diols is of great interest.A series of esters and their phosphorus-and silicon-containing derivatives was synthesized by reacting cyclic neopolyols -2,2,6,6-tetramethylcyclohexanol A [4], 2,2,5,5-tetramethylolcyclopentanol B [5], cyclic diols -1,1-dimethylol-3-cyclohexene C, and 2,2-dimethylolbicyclo(2,2,1)heptane-5 D [6] with C 3 -C 8 aliphatic monocarboxylic acids and C 5 -C 6 synthetic fatty acids (SFA) [7][8][9]. The quality of these esters was comparatively analyzed.Esters A and B with C 5 -C 6 SFA were successfully tested as a dispersion medium for high-temperature plastic greases to replace pentaerythritol ester in LZ-31 grease (MASMA Co., Kiev) and compressor oils used in production of high-pressure polyethylene (AZOT Co., Severodonetsk) instead of the imported oil Ondina.

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Palladium-ceria catalysts: Metal-support interactions and reactivity of palladium in selective hydrogenation of but-1-yne

Cited by 13 publications

References 18 publications

Identity of the Active Site in Gold Nanoparticle-Catalyzed Sonogashira Coupling of Phenylacetylene and Iodobenzene

Identity of the Active Site in Gold Nanoparticle-Catalyzed Sonogashira Coupling of Phenylacetylene and Iodobenzene

Energy Efficiency Enhancement of Ethanol Electrooxidation on Pd–CeO₂/C in Passive and Active Polymer Electrolyte‐Membrane Fuel Cells

Thermooxidative stability of cyclic polyhydric alcohol esters

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Palladium-ceria catalysts: Metal-support interactions and reactivity of palladium in selective hydrogenation of but-1-yne

Cited by 13 publications

References 18 publications

Identity of the Active Site in Gold Nanoparticle-Catalyzed Sonogashira Coupling of Phenylacetylene and Iodobenzene

Identity of the Active Site in Gold Nanoparticle-Catalyzed Sonogashira Coupling of Phenylacetylene and Iodobenzene

Energy Efficiency Enhancement of Ethanol Electrooxidation on Pd–CeO2/C in Passive and Active Polymer Electrolyte‐Membrane Fuel Cells

Thermooxidative stability of cyclic polyhydric alcohol esters

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Energy Efficiency Enhancement of Ethanol Electrooxidation on Pd–CeO₂/C in Passive and Active Polymer Electrolyte‐Membrane Fuel Cells