Gold nanoparticle catalysts for selective hydrogenations

Mitsudome, Takato; Kaneda, Kiyotomi

doi:10.1039/c3gc41360h

Cited by 283 publications

(167 citation statements)

References 195 publications

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“…Most research work on noble metal nanocatalysts, especially for gold nanocatalyst, has been focused on oxidation reactions [9,10], and more extensive studies on highly efficient hydrogenations are required [11][12][13][14][15]. In the selective hydrogenation of unsaturated α,β-aldehydes, gold nanocatalysts have shown high selectivity toward the C=O group hydrogenation to the unsaturated alcohol, while other noble metals like Pd and Pt often present intrinsic selectivity toward C=C bond hydrogenation to saturated aldehyde [16].…”

Section: Introductionmentioning

confidence: 99%

Selective Hydrogenation of Cinnamaldehyde Catalyzed by ZnO-Fe2O3 Mixed Oxide Supported Gold Nanocatalysts

et al. 2018

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ZnO-Fe 2 O 3 mixed oxides and supported gold nanocatalysts were prepared by using coprecipitation and deposition-precipitation methods, respectively. Cinnamaldehyde hydrogenation over various ZnO-Fe 2 O 3 mixed oxides supported gold nanocatalysts have been investigated at 140 • C and a hydrogen pressure of 1.0 MPa. The molar ratio of Fe to Zn was found to greatly affect the selective hydrogenation catalytic activity of ZnO-Fe 2 O 3 mixed oxide supported gold nanocatalysts. Among these supported gold nanocatalysts in this work, Au/Zn 0.7 Fe 0.3 O x (Au loading of 1.74 wt %) exhibited the highest conversion of cinnamaldehyde and high selectivity to cinnamal alcohol. The excellent catalytic activity of Au/Zn 0.7 Fe 0.3 O x was tightly associated with a large surface area, small gold nanoparticles, and good H 2 dissociation ability at low temperature.

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Section: Introductionmentioning

confidence: 99%

Selective Hydrogenation of Cinnamaldehyde Catalyzed by ZnO-Fe2O3 Mixed Oxide Supported Gold Nanocatalysts

et al. 2018

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“…Indeed, in reactions where H 2 dissociation has already occurred, Au has been shown to be an extremely effective catalyst for hydrogenation. 23 Other possible secondary reasons for the difference between Au and Pt include: i) Cluster density geometry favoring Au more than Pt with the presence of more edges in metal clusters allowing for greater hydrogenation 16,17,20,23 ii) Au has greater selectivity to adsorbed species than Pt, particularly with H. 22,41,42 The different dispersions observed of Pt and Au as shown by AFM (Fig. 3) make it impossible to determine if these secondary effects are directly involved in the observed enhanced hydrogenation in graphene using Au.…”

Section: Resultsmentioning

confidence: 99%

Metal Catalyzed Electrochemical Synthesis of Hydrocarbons from Epitaxial Graphene

Daniels

Obe

Daas

et al. 2016

J. Electrochem. Soc.

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Pt/Au transition metal catalysts are shown to significantly improve the electrochemical hydrogenation of low defect density epitaxial graphene (EG) layers ∼2ML thick on Si-face 6H-SiC Initial experiments using Pt nanoparticles deposited from aqueous solution showed large increases in hydrogenation, however, this method demonstrated large variability, attributed to the aqueous nature of the catalyst deposition, known to change the conductivity and reactivity of graphene, as well as clustering of Pt nanoparticles. To reduce process variability, 20 nm thick evaporated metals were used. From Raman, the average observed hydrogen cluster density ∼10 11 cm −2 was similar to the average densities of intrinsic defects (10 10,11 cm −2 ) and charge impurities (10 11 cm −2 ) consistent with recent reports that these sites play a crucial role in the hydrogenation of EG. Au catalysts (3.23 ± 0.22%wt) showed slightly better H-incorporation than Pt (2.81 ± 0.03%wt), an observation we attribute to the fact that H 2 dissociation is no longer the rate-limiting step, as H + is readily available in the aqueous state. The electrochemical enablement of these hydrogenation pathways using catalysts offers new routes to carbon chemistries for hydrogen storage, bandgap engineered hydrocarbons as well as EG-based battery electrodes.

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“…Heterogeneous reductive processes catalyzed by supported gold nanoparticles (Au NPs) [1][2][3][4][5] and nanoporous gold 6 have received considerable attention especially over the past decade. The reductants employed are H 2 (direct hydrogenation) and CO/H 2 , formates, alcohols, hydrosilanes or hydroborane (transfer hydrogenation).…”

Section: Introductionmentioning

confidence: 99%

Reduction of quinolines to 1,2,3,4-tetrahydroquinolines with hydrosilanes/ethanol catalyzed by TiO2-supported gold nanoparticles under solvent free conditions

Louka¹,

Gryparis²,

Stratakis³

2015

Arkivoc

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Gold nanoparticles supported on TiO 2 (1 mol%) catalyze the reduction of a series of functionalized quinolines into 1,2,3,4-tetrahydroquinolines using hydrosilanes/ethanol (hydride/proton) as the reductant system. A typical reaction requires 4 molar equivalents of phenyldimethylsilane (reductant of choice), 4 molar equivalents of ethanol as a reagent and heating to 70 o C under solvent free conditions. The isolated yields are moderate to excellent and in certain cases the reaction rate is exceedingly fast. Mechanistic analysis revealed the stereoselective addition of two hydrides (from hydrosilane) on positions C2 and C4 of the quinoline ring and two protons (from ethanol) on positions C3 and the nitrogen atom.

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Gold nanoparticle catalysts for selective hydrogenations

Cited by 283 publications

References 195 publications

Selective Hydrogenation of Cinnamaldehyde Catalyzed by ZnO-Fe2O3 Mixed Oxide Supported Gold Nanocatalysts

Selective Hydrogenation of Cinnamaldehyde Catalyzed by ZnO-Fe2O3 Mixed Oxide Supported Gold Nanocatalysts

Metal Catalyzed Electrochemical Synthesis of Hydrocarbons from Epitaxial Graphene

Reduction of quinolines to 1,2,3,4-tetrahydroquinolines with hydrosilanes/ethanol catalyzed by TiO2-supported gold nanoparticles under solvent free conditions

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