Bimetallic Au–Pd nanoparticles supported on silica with a tunable core@shell structure: enhanced catalytic activity of Pd(core)–Au(shell) over Au(core)–Pd(shell)

“…05-0681). 53 Such a weakly intense peak suggests that palladium is highly dispersed over the NiO lattice forming an integrated structure. 47 X-ray photoelectron spectroscopy (XPS) analysis was performed to investigate the chemical state of Pd and NiO scaffolds.…”

Section: Synthesis Structural and Textural Propertiesmentioning

confidence: 99%

Acceptorless dehydrogenation of alcohols to carboxylic acids by palladium nanoparticles supported on NiO: delving into metal–support cooperation in catalysis

2022

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“…The detailed reason is unknown, but I anticipated that the Pd more stabilized form while converted into shell. In other literature, Pd _ Au core-shell structures have been successfully fabricated on silica supports with Au as shell 39) , so the effect of the support and reductant may be significant.…”

Section: Microscope Analysismentioning

confidence: 99%

Liquid Phase Oxidation of Glycerol over Gold-based Catalysts in Flow and Batch Reactor

MIMURA

2023

J. Jpn. Petrol. Inst.

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The catalyst prepared based on gold catalyst was used for the oxidation reaction of glycerol using molecular oxygen as an oxidant. The resulting products are carboxylic acids, which are expected to be high value-added and highly functional molecules. The reaction was carried out using both batch and flow reactors. Particular emphasis was placed on the development of catalysts suitable for flow reactors, and we have found catalysts with both high activity and long life. Investigation of the reaction mechanism was focused on the Au/Al2O3 catalyst, clarifying the effect of added alkali and proposing a mechanism by which oxygen is activated on the catalyst. The use of high-resolution electron microscopy has revealed the state of other noble metals complexed with gold in the nanoparticle catalysts, which has also enabled a discussion of their influence on the reaction.

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“…[32] The selective hydration of nitriles to amides under mild reaction conditions is difficult. [33] A large number of precious metals such as Au, [34,35] Pt, [36] Ru, [29][30][31]37] Rh, [38,39] Pd, [40,41] and so forth have been used for the hydration of nitriles, however due to their limited accessibility and moisture sensitivity still demand to search for a more effective protocol using low-cost metals, namely, Co, Fe, Cu, Ni, and so forth. Despite all the attempts, most of the methods reported to date have some limitations such as long reaction time, high quantity of reagents, high temperatures (180 C, 160 C, 140 C, and 120 C-100 C), [42] use of expensive catalysts, [43,44] and inert atmosphere (Ar, N 2 ).…”

Section: Introductionmentioning

confidence: 99%

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

Hazarika

Borah

2022

Applied Organom Chemis

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The silica‐supported cobalt ferrite spinel nanocatalyst has been successfully synthesized by the coprecipitation method and extensively characterized by FTIR, XRD, SEM‐EDX, TEM, BET, VSM, XPS, TGA, and ICP‐AES analysis. The bands observed at 3435 cm−1 (ν OH of Si‐OH) and 1637 cm−1 (γ OH of Si‐OH) in the FTIR spectrum of the as‐synthesized nanocatalyst unambiguously tell the presence of silica support. Moreover, a very weak intensity and a medium intensity peak at 683 cm−1 and 463 cm−1 suggested intrinsic stretching vibrations of Fe‐O and Co‐O of cobalt ferrite, respectively. The XRD pattern confirms the formation of CoFe2O4 spinel. The average crystallite size was found to be 5.4 nm as calculated by using the Debye–Scherrer equation based on the (220) plane while the average particle size was found to be 5.08 nm from TEM analysis. The crystalline nature of the nanocomposite was confirmed by the SAED pattern. The successful incorporation of CoFe2O4 on the surface of silica was established by the BET surface area measurements. The silica‐supported cobalt ferrite nanocatalyst has been explored as a heterogeneous multifunctional catalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids as well under mild reaction conditions with moderate to excellent isolated yield of the desired products (60–99%). The catalyst was magnetically recoverable within a time frame of ~90 s and reusable up to the fifth catalytic cycle without profound loss of activity. A magnetic hysteresis study was performed to elucidate the magnetic behavior of the catalyst. The saturation magnetization value of 39.785 emu/g with a coercivity value of 110.87 Oe and saturation remanence value of 5.185 emu/g clearly indicated the presence of a ferromagnetic component in the material.

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Bimetallic Au–Pd nanoparticles supported on silica with a tunable core@shell structure: enhanced catalytic activity of Pd(core)–Au(shell) over Au(core)–Pd(shell)

Abstract: A facile ligand-assisted approach of synthesizing bimetallic Au-Pd nanoparticles supported on silica with tuneable core@shell structure is presented. Manoeuvring the addition sequence of metal salts, both Aucore-Pdshell (Au@Pd-SiO2) and Pdcore-Aushell...

Cited by 7 publications

References 92 publications

Acceptorless dehydrogenation of alcohols to carboxylic acids by palladium nanoparticles supported on NiO: delving into metal–support cooperation in catalysis

Acceptorless dehydrogenation of alcohols to carboxylic acids by palladium nanoparticles supported on NiO: delving into metal–support cooperation in catalysis

Liquid Phase Oxidation of Glycerol over Gold-based Catalysts in Flow and Batch Reactor

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

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