Gold Nanoparticles for Oxidation Reactions: Critical Role of Supports and Au Particle Size

Ishida, Tamao; Taketoshi, Ayako; Haruta, Masatake

doi:10.1007/3418_2020_42

Cited by 4 publications

(2 citation statements)

References 167 publications

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“…Given that the particle size of supported metal catalysts is known to affect the rates of both ODH − and the ORR, − it was important to assess whether this parameter was influenced by metal loading. Representative micrographs and particle size distributions (PSD) obtained by TEM analysis for a selection of monometallic Au x /C and Pd y /C catalysts are presented in Figures S2 and S3, respectively.…”

Section: Resultsmentioning

confidence: 99%

Insights into the Effect of Metal Ratio on Cooperative Redox Enhancement Effects over Au- and Pd-Mediated Alcohol Oxidation

et al. 2023

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The aerobic oxidation of alcohols and aldehydes over supported heterogeneous catalysts can be considered as comprising two complementary and linked processes: dehydrogenation and oxygen reduction. Significant rate enhancements can be observed when these processes are catalyzed by independent active sites, coupled by electron transport between the two catalysts. This effect, termed cooperative redox enhancement (CORE), could significantly influence how researchers approach catalyst design, but a greater understanding of the factors which influence it is required. Herein, we demonstrate that the Au/Pd ratio used in physical mixtures of monometallic catalysts and phase-separated Au and Pd bimetallic catalysts dramatically influences the degree to which CORE effects can promote alcohol oxidation. Perhaps more interestingly, the roles of Au and Pd in this coupled system are determined to be interchangeable. Preliminarily, we hypothesize that this is attributed to the relative rates of the coupled reactions and demonstrate how physical properties can influence this. This deeper understanding of the factors which influence CORE is an important development in bimetallic catalysis.

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Section: Resultsmentioning

confidence: 99%

Insights into the Effect of Metal Ratio on Cooperative Redox Enhancement Effects over Au- and Pd-Mediated Alcohol Oxidation

et al. 2023

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“…Spherical gold nanoparticles (GNPs) have been applied to a wide variety of applications that span the breadth of biological and chemical sciences. Such applications include catalysis, [1][2][3] therapeutics, 4,5 antimicrobics, [6][7][8] and sensing. [9][10][11] Techniques for fabricating gold nanospheres can be broadly categorized into two approaches; top-down and bottom-up.…”

Section: Introductionmentioning

confidence: 99%

Efficient production of uniform gold nanoparticles via a streamlined low-cost, semi-automated, open-source platform

Chavva,

San Juan,

Jaitpal

et al. 2024

Nanoscale

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Small gold nanoparticles for tandem cyclization/reduction and cyclization/hydroalkoxylation reactions

Plevová,

Michelet,

Antoniotti

2024

Commun Chem

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With peculiar structural features at the surface of small metal nanoparticles, some discrete sites can display catalytic behaviour similar to what could be observed with mononuclear metal catalysts in solution. We have studied the transfer of two catalytic tandem reactions from homogeneous to heterogeneous conditions. Tandem cyclisation/reduction of ortho -alkynyl benzaldehyde derivatives was successfully achieved with Au nanoparticles over TiO 2 (Au NPs/TiO 2 ) in the presence of Hantzsch ester with 45-98% yields for 15 examples (average yield: 70.4%). Similarly, tandem cyclisation/hydroalkoxylation of ortho -alkynyl benzaldehyde derivatives was successfully achieved with Au NPs/TiO 2 in methanol or other alcohols with 62-96% yields for 17 examples (average yield: 84.9%). The application potential of this catalytic system was demonstrated with the total synthesis of a bioactive isochromene derivative featuring one of the developed reactions as the key step and the implementation of the tandem cyclisation/hydroalkoxylation in a continuous flow reactor, scaling up the reaction by a factor of 10 without loss of efficiency.

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Gold Nanoparticles for Oxidation Reactions: Critical Role of Supports and Au Particle Size

Cited by 4 publications

References 167 publications

Insights into the Effect of Metal Ratio on Cooperative Redox Enhancement Effects over Au- and Pd-Mediated Alcohol Oxidation

Insights into the Effect of Metal Ratio on Cooperative Redox Enhancement Effects over Au- and Pd-Mediated Alcohol Oxidation

Efficient production of uniform gold nanoparticles via a streamlined low-cost, semi-automated, open-source platform

Small gold nanoparticles for tandem cyclization/reduction and cyclization/hydroalkoxylation reactions

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