Activation de reactions par les polyoxydes d′ethylene III

Gaude, Didier; Goaller, R. Le; Luche, Jean‐Louis; Pierre, Jean‐Louis

doi:10.1016/s0040-4039(01)81714-7

Cited by 12 publications

(8 citation statements)

References 6 publications

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“…3 Traditionally, hydrogenation of BA has been carried out by using stoichiometric Na−K alloys. 4 It also has been found that CCA can be produced from hydrogenation of molten BA without any solvent over carbon-supported precious metal catalysts. Unfortunately, the reaction was usually carried out in scCO 2 or under high H 2 pressures (10−15 MPa) and high temperatures (150−200 °C).…”

Section: Introductionmentioning

confidence: 93%

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RuPd Alloy Nanoparticles Supported on N-Doped Carbon as an Efficient and Stable Catalyst for Benzoic Acid Hydrogenation

et al. 2015

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RuPd alloy nanoparticles (3.6 nm) uniformly dispersed on N-doped carbon (RuPd/CN) was prepared via a simple ultrasoundassisted coreduction method. The RuPd/CN is highly active, selective, and stable in the hydrogenation of benzoic acid to cyclohexanecarboxylic acid under mild conditions with a TOF up to 2066 h −1 . It was found that the bimetallic RuPd/CN catalyst exhibited a substantially enhanced activity in comparison with the monometallic catalysts (Ru/CN and Pd/CN). The reason for the higher performance of the RuPd/CN catalyst is considered to be the increased Ru 0 /Ru n+ ratio induced by the electronic interaction between Ru and Pd, as evidenced by various characterizations. Notably, the different phenomenon of activity platform on different catalysts ascribed to the effect of hydrogen pressure was newly observed and further explained by first-principle studies. Moreover, the factors influencing the adsorption modes of BA, especially the configuration of the carboxyl group, have been investigated preliminarily in first-principle studies, giving a distinct insight from the former work. The reason the carboxyl group in benzoic acid does not undergo hydrogenation, which results in superior selectivity (>99%), is also revealed by a comparison of the thermodynamics of hydrogenation and dissociation of the carboxyl group.

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Section: Introductionmentioning

confidence: 93%

“…Traditionally, hydrogenation of BA has been carried out by using stoichiometric Na–K alloys . It also has been found that CCA can be produced from hydrogenation of molten BA without any solvent over carbon-supported precious metal catalysts.…”

Section: Introductionmentioning

confidence: 99%

RuPd Alloy Nanoparticles Supported on N-Doped Carbon as an Efficient and Stable Catalyst for Benzoic Acid Hydrogenation

et al. 2015

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“…The hydrogenation of benzoic acid and its derivatives have been reported using stoichiometric amounts of Na‐K alloys . However, an environmentally friendly and efficient (recyclable catalyst) catalytic hydrogenation process has advantages over a stoichiometric hydrogenation reaction.…”

Section: Introductionmentioning

confidence: 99%

“…The hydrogenation of benzoic acid and its derivatives have been reportedu sing stoichiometric amounts of Na-K alloys. [18] However, an environmentally friendly and efficient (recyclable catalyst) catalytic hydrogenation process has advantages over as toichiometric hydrogenation reaction. Therefore, severale fficient catalysts based on monometallic Pd, Pt, Rh, and Ru and several alloys have been explored for the aromatic ring hydrogenationo fb enzoic acid and its derivatives.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydrogenation of Arenes in Water Over In Situ Generated Ruthenium Nanoparticles Immobilized on Carbon

et al. 2017

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We describe a tandem process to generate active Ru nanoparticles (≈7 nm) immobilised in situ on carbon from an organometallic precursor and formic acid to afford the hydrogenation of a wide range of arenes and heteroarenes in yields up to 72 % with high conversions and selectivities for the desired products. The hydrogenation of several substrates analogous to lignin‐derived fragments to the corresponding alicyclic products was also achieved. Our experimental investigations evidenced that the observed enhanced activity for arene hydrogenation was driven by the unique structural advantages of the organometallic precursor to activate formic acid, in which the presence of a nitrogen ligand is crucial to achieve a high catalytic activity. TEM analysis revealed the formation of Ru0 nanoparticles, and Hg0 poisoning experiments support the heterogeneous nature of the active catalyst.

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“…In general, aromatic ring hydrogenation requires more severe conditions than those required to hydrogenate other functional groups [7] which would normally lead to preferential reaction of the latter relative to the former. Current alternatives include the use of Na-K alloys for ring hydrogenation of phenyl carboxylic acids [8] and Pd/C [9], Raney Ni [9] or cinchonidine modified Pd/Al 2 O 3 [10] for furan and benzofuran carboxylic acids.…”

Section: Introductionmentioning

confidence: 99%

Use of Water as a Solvent in Directing Hydrogenation Reactions of Aromatic Acids over Pd/carbon Nanofibre Catalysts

et al. 2007

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Activation de reactions par les polyoxydes d′ethylene III

Cited by 12 publications

References 6 publications

RuPd Alloy Nanoparticles Supported on N-Doped Carbon as an Efficient and Stable Catalyst for Benzoic Acid Hydrogenation

RuPd Alloy Nanoparticles Supported on N-Doped Carbon as an Efficient and Stable Catalyst for Benzoic Acid Hydrogenation

Catalytic Hydrogenation of Arenes in Water Over In Situ Generated Ruthenium Nanoparticles Immobilized on Carbon

Use of Water as a Solvent in Directing Hydrogenation Reactions of Aromatic Acids over Pd/carbon Nanofibre Catalysts

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