Oxidation of benzyl alcohol catalyzed by gold nanoparticles under alkaline conditions: weak vs. strong bases

Ferraz, Camila P.; Garcia, Marco Aurélio Suller; Teixeira‐Neto, Érico; Rossi, Liane M.

doi:10.1039/c6ra01795a

Cited by 62 publications

(56 citation statements)

References 55 publications

(152 reference statements)

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“…Superiority of Au‐Pd 1.2 @γ‐Al 2 O 3 over other reported catalysts either monometallic or alloyed was shown by TOF values in Table . Obviously, these reported monometallic catalysts, such as Pd@U−E15 (Pd@periodic mesoporous organosilica), Pd@MB‐1500 (Pd@mesoporous carbon bead), Pd@E10 A20 (Pd@amphiphilic hybrid carbon nanotubes), Pd@Cu(II)‐MOF, Pd@MNP (Pd@magnetic nanoparticles), Pd@pol (Pd@polymer), and Au PVA /TiO 2 (polyvinyl alcohol‐stabilized Au @TiO 2 ), were far less efficient than Au‐Pd 1.2 @γ‐Al 2 O 3 in aerobic oxidation of benzyl alcohol, even though the oxidation was performed in organic solvent using pure oxygen or a high pressure of air as oxidant and external alkalis as cocatalyst (Table , entries 1–7 vs . 10).…”

Section: Resultsmentioning

confidence: 99%

Selective Aerobic Oxidation of Alcohols over Gold‐Palladium Alloy Catalysts Using Air at Atmospheric Pressure in Water

et al. 2019

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A series of bimetallic Au−Pd alloy nanoparticles (NPs) with varied Au/Pd molar ratios was supported on Gamma‐alumina (γ‐Al2O3) surface through the co‐impregnation‐reduction method using HAuCl4 and PdCl2 as metal precursors. Characterization results suggested the high dispersion of Au−Pd alloy NPs, as well as the interplay between the two compositions. Benefitting from the synergistic effects of Au−Pd alloying, the bimetallic Au‐Pdx@γ‐Al2O3 catalysts were highly efficient for selective aerobic oxidation of various alcohols either aromatic or aliphatic in water using air at atmospheric pressure as a sole oxidant without the need for any cocatalyst. Quantitative yields of corresponding aldehydes or ketones were achieved over Au‐Pd1.2@γ‐Al2O3 within 2 h, whereas pure Au@γ‐Al2O3 or Pd@γ‐Al2O3 was far less efficient. More importantly, the “alloying effect” appeared to stabilize the bimetallic NPs against aggregation and poisoning, which made the Au‐Pdx@γ‐Al2O3 more stable and reusable in the aerobic oxidation of alcohols.

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Section: Resultsmentioning

confidence: 99%

Selective Aerobic Oxidation of Alcohols over Gold‐Palladium Alloy Catalysts Using Air at Atmospheric Pressure in Water

et al. 2019

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“…The 2 wt.% Au/HTs catalysts were prepared by a sol immobilization method using NaBH 4 and polyvinyl alcohol (PVA) as reducing and dispersing agents, respectively. The gold nanoparticles were prepared following the method described by N. Dimitratos et al [20,21]. First, a 2% wt.% solution of PVA in distilled water was prepared (PVA/Au (w/w) = 1.2).…”

Section: Gold Nps On Hydrotalcite Supportsmentioning

confidence: 99%

Liquid Phase Furfural Oxidation under Uncontrolled pH in Batch and Flow Conditions: The Role of In Situ Formed Base

et al. 2020

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Selective oxidation of furfural to furoic acid was performed with pure oxygen in aqueous phase under mild conditions and uncontrolled pH using hydrotalcite-supported gold nanoparticles as catalyst. Hydrotalcites with different Mg: Al ratios were tested as support. The effects of reaction time, temperature and furfural/catalyst ratio were evaluated. The catalyst Au/HT 4:1 showed the highest activity and selectivity to the desired product, achieving a complete conversion of furfural to furoic acid after 2 h at 110 °C. Further, stability tests were carried out in a continuous stirred-tank reactor and a progressive deactivation of the catalyst due to the leaching of Mg2+ cations from the support inducing changes in the pH of the reaction medium was observed.

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“…Oxidation reactions are industrially attractive chemical transformations that result in oxygen‐containing products, including aldehydes, ketones, acids and epoxides that can act as key intermediates with broad utility for food, plastic, cosmetic, paint and detergents industries . As oxidation of alcohol can lead to two main products, i.e.…”

Section: Introductionmentioning

confidence: 99%

Salep as a biological source for the synthesis of biochar with utility for the catalysis

Sadjadi

Heravi

Kahangi

2019

Applied Organom Chemis

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Hydrothermal carbonization of salep as a domestic biosource was carried out to afford a biochar, BC, with exceptional catalytic activity. BC can be further magnetized by incorporation of magnetic nanoparticles to furnish a magnetic catalyst, BC‐Fe, with improved recovery and recyclability for the hydrogenation of nitroarenes in the absence of any precious metal. BC‐Fe was also applied as a catalyst support for the immobilization of Pd nanoparticles and development of an efficient, biocompatible and cost‐effective catalyst, Pd@BC‐Fe, with utility for the oxidation of benzyl alcohols under mild reaction condition in a selective manner to afford corresponding acids in high yields. The study of the recyclability of the catalyst confirmed high recyclability of Pd@BC‐Fe.

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Oxidation of benzyl alcohol catalyzed by gold nanoparticles under alkaline conditions: weak vs. strong bases

Abstract: A comparative study of the promotion effect of weak and strong bases in the aqueous oxidation of benzyl alcohol by Au/TiO2 showed that better conversion and aldehyde selectivity can be obtained using weak bases.

Cited by 62 publications

References 55 publications

Selective Aerobic Oxidation of Alcohols over Gold‐Palladium Alloy Catalysts Using Air at Atmospheric Pressure in Water

Selective Aerobic Oxidation of Alcohols over Gold‐Palladium Alloy Catalysts Using Air at Atmospheric Pressure in Water

Liquid Phase Furfural Oxidation under Uncontrolled pH in Batch and Flow Conditions: The Role of In Situ Formed Base

Salep as a biological source for the synthesis of biochar with utility for the catalysis

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