Synthese organique sous champ microondes : premier exemple d'activation specifique en phase homogene

Berlan, J.; Giboreau, Pascale; Lefeuvre, S.; Marchand, Christophe

doi:10.1016/s0040-4039(00)79924-2

Cited by 155 publications

(69 citation statements)

References 10 publications

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“…[28] Using microwaves is a fast way to heat reactants compared with conventional thermal heating. Any presumptions about abnormal "microwave effects" [29][30][31] have been proven wrong in the literature. [32,33] Moreover, microwave reactions are also an "instant on/instant off" energy source, significantly reducing the risk of overheating reactions.…”

Section: à1 and 884 (Mol Product) A C H T U N G T R E N N U N G (Mol Rh)mentioning

confidence: 99%

Microwave Irradiation for the Facile Synthesis of Transition‐Metal Nanoparticles (NPs) in Ionic Liquids (ILs) from Metal–Carbonyl Precursors and Ru‐, Rh‐, and Ir‐NP/IL Dispersions as Biphasic Liquid–Liquid Hydrogenation Nanocatalysts for Cyclohexene

Vollmer

Redel

Abu‐Shandi

et al. 2010

Chemistry A European J

192

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Stable chromium, molybdenum, tungsten, manganese, rhenium, ruthenium, osmium, cobalt, rhodium, and iridium metal nanoparticles (M-NPs) have been reproducibly obtained by facile, rapid (3 min), and energy-saving 10 W microwave irradiation (MWI) under an argon atmosphere from their metal-carbonyl precursors [M(x)(CO)(y)] in the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF(4)]). This MWI synthesis is compared to UV-photolytic (1000 W, 15 min) or conventional thermal decomposition (180-250 degrees C, 6-12 h) of [M(x)(CO)(y)] in ILs. The MWI-obtained nanoparticles have a very small (<5 nm) and uniform size and are prepared without any additional stabilizers or capping molecules as long-term stable M-NP/IL dispersions (characterization by transmission electron microscopy (TEM), transmission electron diffraction (TED), and dynamic light scattering (DLS)). The ruthenium, rhodium, or iridium nanoparticle/IL dispersions are highly active and easily recyclable catalysts for the biphasic liquid-liquid hydrogenation of cyclohexene to cyclohexane with activities of up to 522 (mol product) (mol Ru)(-1) h(-1) and 884 (mol product) (mol Rh)(-1) h(-1) and give almost quantitative conversion within 2 h at 10 bar H(2) and 90 degrees C. Catalyst poisoning experiments with CS(2) (0.05 equiv per Ru) suggest a heterogeneous surface catalysis of Ru-NPs.

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Section: à1 and 884 (Mol Product) A C H T U N G T R E N N U N G (Mol Rh)mentioning

confidence: 99%

Microwave Irradiation for the Facile Synthesis of Transition‐Metal Nanoparticles (NPs) in Ionic Liquids (ILs) from Metal–Carbonyl Precursors and Ru‐, Rh‐, and Ir‐NP/IL Dispersions as Biphasic Liquid–Liquid Hydrogenation Nanocatalysts for Cyclohexene

Vollmer

Redel

Abu‐Shandi

et al. 2010

Chemistry A European J

192

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“…In some early studies of microwave-assisted catalysis results were obtained which were difficult to explain in terms of non-uniform heating of the catalyst and it was suggested that microwave irradiation might interact directly with the reactants to cause an enhancement of the reaction rate [105][106][107]. However, further studies, both theoretical and experimental, have conclusively demonstrated that specific athermal effects are implausible [22,[108][109][110].…”

Section: The Effects Of Microwave Dielectric Heating On Heterogeneousmentioning

confidence: 99%

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Zhang

Hayward

2006

Inorganica Chimica Acta

167

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The application of microwave dielectric heating in a range of environment-related heterogeneous catalytic reaction systems has been reviewed. The reactions investigated include the decomposition of hydrogen sulfide, the reduction of sulfur dioxide with methane, the reformation of methane by carbon dioxide, the hydrodesulfurization of thiophene, and the oxidative coupling of methane. The interaction of microwave irradiation with heterogeneous catalytic systems and its consequence for the microwave heating behaviour of catalysts have been examined. The effect/mechanism of microwave dielectric heating on heterogeneous catalytic reaction systems has also been discussed.

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“…In the early studies on microwave-assisted catalysis, the results that could not be explained solely as a consequence of simple thermal heating led to the suggestions of a non-thermal microwave-specific effect [7][8][9]. However, further studies both theoretically and experimentally have conclusively demonstrated that the specific athermal effects are implausible.…”

Section: Introductionmentioning

confidence: 99%

Untitled

Zhang

2003

Catalysis Letters

181

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Synthese organique sous champ microondes : premier exemple d'activation specifique en phase homogene

Cited by 155 publications

References 10 publications

Microwave Irradiation for the Facile Synthesis of Transition‐Metal Nanoparticles (NPs) in Ionic Liquids (ILs) from Metal–Carbonyl Precursors and Ru‐, Rh‐, and Ir‐NP/IL Dispersions as Biphasic Liquid–Liquid Hydrogenation Nanocatalysts for Cyclohexene

Microwave Irradiation for the Facile Synthesis of Transition‐Metal Nanoparticles (NPs) in Ionic Liquids (ILs) from Metal–Carbonyl Precursors and Ru‐, Rh‐, and Ir‐NP/IL Dispersions as Biphasic Liquid–Liquid Hydrogenation Nanocatalysts for Cyclohexene

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

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