Surfactant-free Pd@pSiO<sub>2</sub> yolk–shell nanocatalysts for selective oxidation of primary alcohols to aldehydes

Kim, Aram; Bae, Hee Seon; Park, Kang Hyun; Song, Hyunjoon

doi:10.1039/c5nj01295c

Cited by 10 publications

(9 citation statements)

References 43 publications

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“…This phenomenon has been recently observed with Pd-catalysts under similar conditions and steric hindrance was given as the reason for this lower reactivity [58,59]. Veratryl alcohol oxidation was rarely reported using Pd catalysts, even more with O 2 as oxidant [60][61][62][63][64][65]. Here, veratryl alcohol reacted similarly to vanillic alcohol with the Pd NPs suspension leading to 83% of veratraldehyde after 2 h (entry 2).…”

Section: Application To the Oxidation Of Benzyl Alcoholssupporting

confidence: 68%

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

et al. 2021

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This study concerns one of the rare applications of a suspension of palladium nanoparticles in water for oxidation reactions. The aqueous suspension containing well dispersed nanoparticles of 3.85 nm was obtained following a straightforward procedure involving the reduction of Na 2 PdCl 4 with NaBH 4 in the presence of PVP as stabilizing agent. In the way of oxidative catalytic valorisation of lignin, the aqueous suspension was directly applied as catalytic medium for the selective oxidation of vanillic alcohol into vanillin (80 °C, O 2 , 1 h) with more than 90% yield. Reusability of the catalytic medium has been demonstrated, acting as "quasi-homogeneous catalyst". More sophisticated lignin-derived substrates like veratryl alcohol and hydrobenzoin gave yields of 50-80% to the respective aldehyde and ketone. In parallel, this as-synthesized suspension was directly used to prepare a Pd/TiO 2 catalyst, the latter showing less efficiency for the catalytic transformations.

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Section: Application To the Oxidation Of Benzyl Alcoholssupporting

confidence: 68%

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

et al. 2021

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“…148,179,209,216 So, the metal/silica YS NPs are discussed separately under two subclasses: (i) noble metal/ silica and (ii) magnetic metal/silica. 23,47,56,92,94,96,157,170,177,211,214,215,217,218,[220][221][222][223] Ag, 219,222,224 Cu, 219,225 Pt, 210,226 and Pd 178,213,223,227,228 are reported as cores within a hollow silica shell. Most of the researchers have studied the SPR and catalytic properties of noble metal/silica YS NPs.…”

Section: Spherical Shape Ys Npsmentioning

confidence: 99%

Yolk/shell nanoparticles: classifications, synthesis, properties, and applications

2015

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Core/shell nanoparticles were first reported in the early 1990s with a simple spherical core and shell structure, but the area is gradually diversifying in multiple directions such as different shapes, multishells, yolk/shell etc., because of the development of different new properties of the materials, which are useful for several advanced applications. Among different sub-areas of core/shell nanoparticles, yolk/shell nanoparticles (YS NPs) have drawn significant attention in recent years because of their unique properties such as low density, large surface area, ease of interior core functionalization, a good molecular loading capacity in the void space, tunable interstitial void space, and a hollow outer shell. The YS NPs have better properties over simple core/shell or hollow NPs in various fields including biomedical, catalysis, sensors, lithium batteries, adsorbents, DSSCs, microwave absorbers etc., mainly because of the presence of free void space, porous hollow shell, and free core surface. This review presents an extensive classification of YS NPs based on their structures and types of materials, along with synthesis strategies, properties, and applications with which one would be able to draw a complete picture of this area.

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“…[6] To overcome the obstacles, certain model compounds including veratryl alcohol (VA) and 2-phenoxy-1-phenylethanol are employed to elaborate the selective oxidation of C α À OH in the presences of different catalysts. [7] It has been demonstrated that noble metal and bimetal nanoparticles supported on certain matrices, such as Au/Al 2 O 3 , [8] Au/CeO 2 , [9] Pd/SiO 2 , [10] Pd/PG, [11] Ru/PG, [11] Ru/Al 2 O 3, [12] Ru@zeolitic imidazolate framework-8 (ZIF-8), [13] AuPd/covalent triazine frameworks, [14] AuPd/Al 2 O 3 , [15] AuCu/Al 2 O 3 , [15][16] and AuCu/C, [16] show usually decent catalytic activities for C α À OH oxidation in lignin model compounds and even lignin. Compared to nanosized Au and Pd particles, Ru nanoparticles (NPs) and their composites usually show relatively low catalytic activities, for example, the oxidation reactions need to be conducted using organic oxidant (PhIO), [11] ionic liquid [13] or high temperature (160 °C).…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of Veratryl Alcohol Derivatives Using RuCo/rGO Composites

Lei

et al. 2022

Chemistry A European J

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Chemoselectively oxidizing Cα−OH to C=O has been considered as a key step for the oxidative depolymerization of lignin. In this work, we design and prepare a series of composites of RuCo alloy nanoparticles and reduced graphene oxide (RuCo/rGO) with different Ru to Co ratios and explore their catalytic activities in the oxidation of veratryl alcohol derivatives, which usually serve as the model compounds for studying lignin oxidation. It is illustrated that the Ru to Co ratio determines the morphology and average size of the RuCo alloy nanoparticles on rGO, and the overall catalytic activities of the composites. The RuCo alloy nanoparticles on rGO with Ru to Co ratios of 1 : 0 to 1.2 : 1 show a unique flower‐shaped morphology that increases the exposure of the active sites and thus promotes their contact with the substrates. The RuCo/rGO composites exhibit high catalytic activities for the oxidation of Cα−OH to aldehydes at 100 °C for 2 h. Additionally, the Co component affords the RuCo/rGO composites with magnetic properties that make the separation and recovery of the catalyst simple. Given the high catalytic performances and easy recovery, the RuCo/rGO composites would be potentially useful for the depolymerization of lignin.

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Surfactant-free Pd@pSiO₂ yolk–shell nanocatalysts for selective oxidation of primary alcohols to aldehydes

Abstract: The surfactant-free Pd@pSiO2 yolk–shell nanoparticles proved to be an efficient catalyst for the oxidation of substituted benzyl alcohols.

Cited by 10 publications

References 43 publications

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

Yolk/shell nanoparticles: classifications, synthesis, properties, and applications

Catalytic Oxidation of Veratryl Alcohol Derivatives Using RuCo/rGO Composites

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Surfactant-free Pd@pSiO2 yolk–shell nanocatalysts for selective oxidation of primary alcohols to aldehydes

Abstract: The surfactant-free Pd@pSiO2 yolk–shell nanoparticles proved to be an efficient catalyst for the oxidation of substituted benzyl alcohols.

Cited by 10 publications

References 43 publications

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

Selective Aerobic Oxidation of Benzyl Alcohols with Palladium(0) Nanoparticles Suspension in Water

Yolk/shell nanoparticles: classifications, synthesis, properties, and applications

Catalytic Oxidation of Veratryl Alcohol Derivatives Using RuCo/rGO Composites

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Surfactant-free Pd@pSiO₂ yolk–shell nanocatalysts for selective oxidation of primary alcohols to aldehydes