Bimetallic Cu-Pd Nanoparticles Supported on Bio-silica as an Efficient Catalyst for Selective Aerobic Oxidation of Benzylic Alcohols

Buxaderas, Eduardo; Graziano-Mayer, Marilyn; Volpe, María Alicia; Radivoy, Gabriel

doi:10.1055/s-0036-1588628

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Metal nanoparticles (NPs) can form heterogeneous catalysts with promising potential because they tend to have good robustness and can be easily immobilized. Although several groups have reported heterogeneous Cu NP catalysts for the aerobic oxidation of alcohols with TEMPO, [26][27][28][29] harsh reaction conditions are generally necessary. More importantly, aliphatic alcohols are rarely applied in these reports.…”

Section: Introductionmentioning

confidence: 99%

Aerobic oxidation of alcohols enabled by nitrogen-doped copper nanoparticle catalysts

Tobita

Yasukawa

Yamashita

et al. 2022

Catal. Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

Aerobic oxidation of alcohols enabled by nitrogen-doped copper nanoparticle catalysts

Tobita

Yasukawa

Yamashita

et al. 2022

Catal. Sci. Technol.

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“…Ni-Fe supported by activated carbon was synthesized by [151] and used for the hydrogenation of biomass-derived ethyl levulinate into γ-valerolactone. Similarly, Pd-based bimetallic NPs supported on silica have been used as efficient catalysts for the selective oxidation of alcohols to aldehydes [152]. In addition to catalysis, solid-supported bimetallic NPs have also been investigated for their potential applications in other fields, such as electrocatalysis and sensing.…”

Section: Solid-supported Bimetallic Nanoparticlesmentioning

confidence: 99%

Synthesis of Bimetallic Nanoparticles and Applications—An Updated Review

Idris

Roy

2023

Crystals

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The manipulation of matter at the atomic level (nanotechnology) has experienced an explosion in research interest in recent years. Bimetallic nanoparticles are vital due to their high biocompatibility, stability and comparatively less toxicity. The synthesis methods that include physical, chemical and biological methods are explored and explained in detail, along with their advantages. They have a wide range of applications due to their synergistic properties including biological applications (in medicine and agriculture), environmental application (in water treatment and removal of toxic contaminants), engineering application (in nanosensors, nanochips and nano-semiconductors) and chemical and physical application (in optics, catalysis and paints). The green synthesis approach is a promising method of synthesis that can give rise to more biocompatible and less toxic bimetallic nanoparticles due to increasing environmental pollution. However, despite these interesting attributes of bimetallic nanoparticle, there is still much work to be done to improve the biocompatibility of bimetallic nanoparticles because of their toxicity and potentially hazardous effects.

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“…Furthermore, the homogeneous character of these copper catalytic systems inherently entails problems related to their separation and recycling, as well their stability. These issues were recently addressed by combining TEMPO with copper oxide or surface-oxidized copper metal nanoparticles supported on various supports, resulting in robust and active heterogeneous catalytic systems. − Metal–organic frameworks (MOFs) were shown to be excellent support for metallic and metal oxide nanoparticles mainly because their extremely high surface area promotes the efficient dispersion of metal precursors within the crystal bulk, resulting in highly dispersed nanoparticles after a metal cation reduction step. Among them, ZIF-8, a prototypical MOF composed of a zinc-imidazolate framework, was particularly studied as a support for a variety of metal nanoparticles (Au, Pd, Ru, Cu, etc.…”

Section: Introductionmentioning

confidence: 99%

Copper Nanoparticles Supported on ZIF-8: Comparison of Cu(II) Reduction Processes and Application as Benzyl Alcohol Oxidation Catalysts

Zan,

Ben Romdhane,

Miche

et al. 2023

ACS Appl. Mater. Interfaces

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We report the synthesis of a stable heterogeneous catalyst based on copper metal nanoparticles with oxidized surface supported on ZIF-8 for the oxidation of benzyl alcohol under mild temperature and using air as a sustainable oxygen source as well as for the implementation of the tandem “one-pot” catalytic system allowing the sustainable synthesis of benzylidene malononitrile. The influence of the reduction process applied to form the nanoparticle upon the catalyst texture and its performances was extensively examined. After ZIF-8 impregnation with a copper chloride precursor, the reduction of cupric ions into Cu0 nanoparticles was carried out according to two procedures: (i) by soaking the solid into a solution of NaBH4 and (ii) by submitting it to a flow of gaseous H2 at 340 °C. The in-depth physicochemical characterization and comparison of the resulting two types of Cu/ZIF-8 materials reveal significant differences: the reduction with NaBH4 led to the formation of 16 nm sized Cu0 nanoparticles (NP) mainly localized on the external surface of the ZIF-8 crystals together with ZnO nanocrystallites, while the reduction under H2 flow resulted in Cu0 nanoparticles with a mean size of 22 nm embedded within the bulk of ZIF-8 crystals. More, when NaBH4 was used to reduce cupric ions, ZnO particles were highlighted by high-resolution microcospy imaging. Formation of ZnO impurities was confirmed by the photoluminescence analysis of ZIF-8 after NaBH4 treatment. In contrast, ZnO was not detected on ZIF-8 treated with H2. Both types of Cu0 NPs supported on ZIF-8 were found to be active as catalysts toward the aerobic oxidation of benzyl alcohol under moderate temperature (T < 80 °C) and using air as a sustainable O2 source. Benzaldehyde yield of 66% and selectivity superior to 90% were obtained with the Cu/ZIF-8 catalyst prepared under H2 flow after 24 h under these conditions. The same material could be recycled 5 times without loss of activity, unlike the catalysts synthesized with NaBH4, as a result of the leaching of the surface copper NPs over the consecutive catalytic cycles. Finally, the most stable catalyst was successfully implemented in a tandem “one-pot” catalytic system associating benzyl alcohol oxidation and Knoevenagel condensation to synthesize benzylidene malononitrile.

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Bimetallic Cu-Pd Nanoparticles Supported on Bio-silica as an Efficient Catalyst for Selective Aerobic Oxidation of Benzylic Alcohols

Cited by 10 publications

References 7 publications

Aerobic oxidation of alcohols enabled by nitrogen-doped copper nanoparticle catalysts

Aerobic oxidation of alcohols enabled by nitrogen-doped copper nanoparticle catalysts

Synthesis of Bimetallic Nanoparticles and Applications—An Updated Review

Copper Nanoparticles Supported on ZIF-8: Comparison of Cu(II) Reduction Processes and Application as Benzyl Alcohol Oxidation Catalysts

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