Immobilization of a Ligand-Preserved Giant Palladium Cluster on a Metal Oxide Surface and Its Nobel Heterogeneous Catalysis for Oxidation of Allylic Alcohols in the Presence of Molecular Oxygen

Ebitani, Kohki; Fujie, Yoko; Kaneda, Kiyotomi

doi:10.1021/la981720a

Cited by 66 publications

(31 citation statements)

References 25 publications

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“…Among various metal/metal oxide composite nanostructures, supported Pd nanocatalysts have been found to play an important role for a number of reactions, including hydrogenation reaction, the carbon-carbon cross-coupling reaction, the oxidation of primary alcohols, the direct generation of H 2 O 2 from H 2 and O 2 , and so on [27][28][29][30]. Recently, Lee et al [31] reported the preparation of Pd/ SnO 2 composite nanorods by using NaBH 4 as reducing agent via a solution process, but the size of the Pd nanoparticles is large, limited their applications in the catalysis.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Active Pd Nanocatalyst Supported on Core-Sheath Conducting Polymer/Metal Oxide Composite Nanorods

Xue

Nie

2012

Catal Lett

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A facile and aqueous-phase method based on the electron transfer reduction process for fabricating coresheath structured polyaniline (PANI)/SnO 2 composite nanorods supported Pd nanocatalyst has been demonstrated. The Pd nanoparticles synthesized by this strategy have a small size of smaller than 3.0 nm. The well dispersed Pd nanoparticles with small sizes supported on coresheath PANI/SnO 2 composite nanorods exhibited an ultrahigh catalytic activity during the catalytic reduction of p-nitrophenol into p-aminophenol by NaBH 4 in aqueous solution. The kinetic apparent rate constant (k app ) reach to be about 26.9 9 10 -3 s -1 . It is believed that this method could be extended to cover many kinds of other functional composite nanomaterials where the active component is expected to bring in new features and applications.

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Section: Introductionmentioning

confidence: 99%

Ultrahigh Active Pd Nanocatalyst Supported on Core-Sheath Conducting Polymer/Metal Oxide Composite Nanorods

Xue

Nie

2012

Catal Lett

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“…3 nm in size) immobilized on TiO 2 catalyzed the oxidation of primary alcohols by oxygen in acetic acid. [5] A bipyridylamide-bound ionic Pd species located inside the mesoporous channels of SBA-15 could catalyze the aerobic oxidation of alcohols in the presence of K 2 CO 3 in toluene, [6] but it was also pointed out that the derived Pd nanoparticles may also account for the actual activity.…”

Section: Introductionmentioning

confidence: 99%

Size‐Dependent Catalytic Activity of Supported Palladium Nanoparticles for Aerobic Oxidation of Alcohols

et al. 2008

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Silica-alumina (SiO 2 -Al 2 O 3 )-supported palladium catalysts prepared by adsorption of the tetrachloropalladate anion (PdCl 4 2À ) followed by calcination and reduction with either hexanol or hydrogen were studied for the aerobic oxidation of alcohols. The mean size of the Pd particles over the SiO 2 -Al 2 O 3 support was found to depend on the Si/Al ratio, and a decrease in the Si/Al ratio resulted in a decrease in the mean size of the Pd nanoparticles. By changing the Si/Al ratio, we obtained supported Pd nanoparticles with mean sizes ranging from 2.2 to 10 nm. The interaction between the Pd precursor and the support was proposed to play a key role in tuning the mean size of the Pd nanoparticles. The Pd/SiO 2 -Al 2 O 3 catalyst with an appropriate mean size of Pd particles could catalyze the aerobic oxidation of various alcohols to the corresponding carbonyl compounds, and this catalyst was particularly efficient for the solvent-free conversion of benzyl alcohol. The intrinsic turnover frequency per surface Pd atom depended significantly on the mean size of Pd particles and showed a maximum at a medium mean size (3.6-4.3 nm), revealing that the aerobic oxidation of benzyl alcohol catalyzed by the supported Pd nanoparticles was structure-sensitive.

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“…One of the promising properties is porosity in the support material, to act as a molecular transport pathway to the active catalyst surface and to improve the total reaction rate and product selectivity. In order to prepare heterogeneous catalysts with metallic nanoparticles, including Pd, or to prevent nanoparticles from coalescing, various types of inorganic shells, such as silica [7][8][9], carbon and metal oxides around the nanoparticles, may be used [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Statistical Optimization of a Novel Approach for the Reductive Debenzylation of 2,4,6,8,10,12-Hexabenzyl-2,4,6,8,10,12-hexaazaisowurtzitane Using Pd@SiO2 Nano Catalyst

Zarandi¹,

Bayat²,

Zebardasti³

et al. 2017

Cent. Eur. J. Energ. Mater.

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Abstract:The synthesis of 2,6,8,4,6,8,10,, from 2, 4,6,8,10,4,6,8,10, is a key step in the preparation of 2, 4,6,8,10,4,6,8,10,. In this study, a novel highly efficient nano catalyst based on Pd@SiO2 was used for the reductive debenzylation of HBIW. It is notable that an orthogonal array design OA9 was applied as a statistical optimization method for the synthesis of TADB. The current application of the Taguchi method in optimizing the experimental parameters of the TADB synthetic procedure was successful. TADB was synthesized by investigating the effect of the reaction conditions, such as catalyst percentage, time (h) and temperature (°C). The effects of these factors on the yield of TADB were evaluated quantitavely by the analysis of variance (ANOVA). The Pd@SiO2 nano catalyst, consisting of a palladium core with SiO2 monolayer shells, was synthesized and characterized by SEM, TEM and IR spectroscopy. The optimum condition indicated that the use of fresh Pd@SiO2 nano catalyst provides a high yield (90%). The use of Pd@SiO2 nano catalyst after recovery gave a yield of 65%.

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Immobilization of a Ligand-Preserved Giant Palladium Cluster on a Metal Oxide Surface and Its Nobel Heterogeneous Catalysis for Oxidation of Allylic Alcohols in the Presence of Molecular Oxygen

Cited by 66 publications

References 25 publications

Ultrahigh Active Pd Nanocatalyst Supported on Core-Sheath Conducting Polymer/Metal Oxide Composite Nanorods

Ultrahigh Active Pd Nanocatalyst Supported on Core-Sheath Conducting Polymer/Metal Oxide Composite Nanorods

Size‐Dependent Catalytic Activity of Supported Palladium Nanoparticles for Aerobic Oxidation of Alcohols

Statistical Optimization of a Novel Approach for the Reductive Debenzylation of 2,4,6,8,10,12-Hexabenzyl-2,4,6,8,10,12-hexaazaisowurtzitane Using Pd@SiO2 Nano Catalyst

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