Palladium-loaded oxidized diamond catalysis for the selective oxidation of alcohols

Yasu-eda, Takashi; Se-ike, Ryo; Ikenaga, Naoki; Miyake, Takanori; Suzuki, Toshimitsu

doi:10.1016/j.molcata.2009.02.039

Cited by 24 publications

(12 citation statements)

References 41 publications

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“…However, the cinnamaldehyde product is unstable with respect to decarbonylation (to styrene) and hydrogenation (to 3-phenylpropionaldehyde), leaving only 22 % of reactively formed cinnamaldehyde intact. [3][4][5][6][7][8][9][10][11][12][13][14][15] phenylpropionaldehyde intermediate is itself extremely unstable with respect to subsequent oxidation to the corresponding 3-phenylpropanoic acid. Interestingly, reactively-formed cinnamaldehyde does not undergo over-oxidation to cinnamic acid under our conditions, presumably because surface hydrogen 20 co-liberated during its formation from cinnamyl alcohol promotes competing hydrogenolysis/hydrogenation pathways.…”

Section: Cinnamyl Alcohol Selective Oxidationmentioning

confidence: 99%

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Tunable Pt nanocatalysts for the aerobic selox of cinnamyl alcohol

et al. 2013

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The selective aerobic oxidation of cinnamyl alcohol over Pt nanoparticles has been tuning via the use of 5 mesoporous silica supports to control their dispersion and oxidation state. High area two-dimensional SBA-15, and three-dimensional, interconnected KIT-6 silica significantly enhance Pt dispersion, and thus surface PtO 2 concentration, over that achievable via commercial low surface area silica. Selective oxidation activity scales with Pt dispersion in the order KIT-6 ≥ SBA-15 > SiO 2 , evidencing surface PtO 2 as the active site for cinnamyl alcohol selox to cinnamaldehyde. Kinetic mapping has quantified key 10 reaction pathways, and the importance of high O 2 partial pressures for cinnamaldehyde production.

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Section: Cinnamyl Alcohol Selective Oxidationmentioning

confidence: 99%

“…[7][8][9] Palladium has been extensively studied for the selective oxidation of allylic alcohols, 4,[10][11][12] wherein sophisticated in-situ/operando spectroscopic and kinetic measurements have identified surface PdO as the active site responsible for crotyl and cinnamyl alcohol. 13 22 is also effective towards allylic alcohol selox.…”

Section: Introductionmentioning

confidence: 99%

Tunable Pt nanocatalysts for the aerobic selox of cinnamyl alcohol

et al. 2013

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“…The XPS spectrum of the Pd 3d core level in Figure d exhibits two pronounced bands at binding energies ( BE s) of 335.7 and 340.9 eV, which are attributed to Pd 0 3d 5/2 and 3d 3/2 photoelectrons, respectively. The presence of two weak satellite peaks at BE = 337.6 and 342.8 eV, ascribed to 3d 3/2 and 3d 5/2 of PdO, suggests a weak and partial oxidation of the Pd NPs, as is often observed for Pd‐based nanocomposites . The Pd 0 /Pd II molar ratio is calculated to be ca.…”

Section: Resultsmentioning

confidence: 77%

Smart Design of Small Pd Nanoparticles Confined in Hollow Carbon Nanospheres with Large Center‐Radial Mesopores

Zhao

et al. 2017

Eur J Inorg Chem

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Although considerable progress has been made with carbon‐based heterogeneous nanocatalysts, great effort is still needed to regulate their structural parameters to further improve their catalytic activities and stabilities. Herein, we have successfully designed and synthesized new composite nanocatalysts composed of porous hollow carbon nanospheres (PHCNs) containing many small Pd nanoparticles (NPs) on their inner surfaces (PHCNs@Pd NPs). Notably, the PHCNs have disordered micropores and large center‐radial mesopores in the shell and craterlike inner surface, and a high density of small Pd NPs are partially confined on the inner surfaces of the PHCNs. Dendrimer‐like mesoporous silica nanospheres (DMSNs) as hard templates play a critical role in the formation of these unique structures. The resulting PHCNs@Pd NP catalyst exhibits high catalytic activity and selectivity as well as good recyclability in the catalytic oxidation of benzyl alcohol to benzaldehyde, and this catalytic performance is attributed to the unique structure of the support coupled with ultradispersed Pd NPs. Moreover, this synthesis strategy may provide some inspiration for the synthesis of advanced composites with complicated nanostructures for various applications.

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“…291 The O-Dia supported catalyst exhibited a high catalytic activity among the support materials of Pd-loaded catalysts in the oxidation of benzyl alcohol at 358 K, showing TOFs of 850 h −1 . The addition of a small amount of CeO 2 to O-Dia supports further improved catalytic activity in the oxidation of 1-phenylethanol with molecular oxygen.…”

Section: Alcohol Oxidation Reactionsmentioning

confidence: 97%

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

2015

Nanostructured Carbon Materials for Catalysis

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For almost twenty years there has been an increasing interest in the use of nanostructured carbon materials as catalyst supports. 1-16 Following the nanotechnology wave, a wide variety of carbon nanomaterials has been investigated as catalyst supports, including fullerenes, CNTs, CNFs, carbon onions, nanodiamonds, FLG or GO. CNTs and CNFs, which constitute a new family of support offering a good compromise between the advantages of AC and high surface area graphite have been particularly studied. The main advantages offered by CNT or CNF supports are: 17 (i) the high purity of the material can avoid self-poisoning; (ii) the mesoporous nature of these supports can be of interest for liquid-phase reactions, thus limiting the mass transfer; (iii) the high thermal conductivity that limits hot-spots that can damage the catalyst; (iv) their well-defined and tunable structure; (v) their rich surface chemistry that offers numerous perspectives for adsorption and dispersion of the active phase; and (vi) the specific metal support interactions, due to high electrical conductivity of the support and to the tunable orientation of the graphene layers, that exist and that can directly affect catalytic activity and selectivity. The possibility to perform catalysis in a confined space is also of great interest. 6,18 From a theoretical viewpoint, graphene provides the ultimate two-dimensional model of a catalytic support. The reason is related to its high theoretical surface area (ca. 2630 m 2 g −1 ), high conductivity, unique graphitized basal plane structure and chemical tolerance. FLG,

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Palladium-loaded oxidized diamond catalysis for the selective oxidation of alcohols

Cited by 24 publications

References 41 publications

Tunable Pt nanocatalysts for the aerobic selox of cinnamyl alcohol

Tunable Pt nanocatalysts for the aerobic selox of cinnamyl alcohol

Smart Design of Small Pd Nanoparticles Confined in Hollow Carbon Nanospheres with Large Center‐Radial Mesopores

Heterogeneous Catalysis on Nanostructured Carbon Material Supported Catalysts

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