Au/ZrO2: an efficient and reusable catalyst for the oxidative esterification of renewable furfural

Signoretto, Michela; Menegazzo, Federica; Contessotto, L.; Pinna, Francesco; Manzoli, Maela; Boccuzzi, F.

doi:10.1016/j.apcatb.2012.09.035

Cited by 81 publications

(99 citation statements)

References 18 publications

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“…The authors assumed that the dopants in the support enhance the support's surface area and acidity and retard crystallization [85]. The effect of calcination on the catalytic activity was also evaluated [82,83,85]. The studies indicate that high temperatures provided more active catalysts.…”

Section: Base-free Furfural Oxidationmentioning

confidence: 99%

“…According to the authors, ZrO 2 is able to provide high Au dispersion and suitable acid-base properties. For this reason, Au/ZrO 2 has been widely explored also for this reaction [82][83][84][85]. Apparently, the addition of dopants, such as sulfates [82][83][84], increased the catalytic activity.…”

Section: Base-free Furfural Oxidationmentioning

confidence: 99%

“…For this reason, Au/ZrO 2 has been widely explored also for this reaction [82][83][84][85]. Apparently, the addition of dopants, such as sulfates [82][83][84], increased the catalytic activity. The authors assumed that the dopants in the support enhance the support's surface area and acidity and retard crystallization [85].…”

Section: Base-free Furfural Oxidationmentioning

confidence: 99%

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Advances in Base-Free Oxidation of Bio-Based Compounds on Supported Gold Catalysts

et al. 2017

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Abstract:The oxidation of bio-based molecules in general, and of carbohydrates and furanics in particular, is a highly attractive process. The catalytic conversion of renewable compounds is of high importance. Acids and other chemical intermediates issued from oxidation processes have many applications related, especially, to food and detergents, as well as to pharmaceutics, cosmetics, and the chemical industry. Until now, the oxidation of sugars, furfural, or 5-hydroxymethylfurfural has been mainly conducted through biochemical processes or with strong inorganic oxidants. The use of these processes very often presents many disadvantages, especially regarding products separation and selectivity control. Generally, the oxidation is performed in batch conditions using an appropriate catalyst and a basic aqueous solution (pH 7-9), while bubbling oxygen or air through the slurry. However, there is a renewed interest in working in base-free conditions to avoid the production of salts. Actually, this gives direct access to different acids or diacids without laborious product purification steps. This review focuses on processes applying gold-based catalysts, and on the catalytic properties of these systems in the base-free oxidation of important compounds: C5-C6 sugars, furfural, and 5-hydroxymethylfurfural. A better understanding of the chemical and physical properties of the catalysts and of the operating conditions applied in the oxidation reactions is essential. For this reason, in this review we put emphasis on these most impacting factors.

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Section: Base-free Furfural Oxidationmentioning

confidence: 99%

Section: Base-free Furfural Oxidationmentioning

confidence: 99%

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Advances in Base-Free Oxidation of Bio-Based Compounds on Supported Gold Catalysts

et al. 2017

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“…Very recently, we have found [25,26] good catalytic performances of highly dispersed Au/ZrO 2 samples, due to the presence of highly dispersed Au clusters able to produce atomic oxygen by reaction with the oxygen molecule. Unfortunately the catalysts, after the first catalytic run, filtration and washing in methanol, did not restore starting performances [26]: selectivity collapses from 98% to 29%. Firstly, we investigated if gold leaching occurred during tests in the liquid phase.…”

Section: Scheme 1 Furfural Oxidative Esterification To Methyl Furoatementioning

confidence: 99%

“…Another reason for the selectivity decrease of Au/ZrO 2 catalysts can be associated with the sintering of gold clusters during the reaction [26]. Therefore, the increase in size of the Au nanoparticles was investigated by HRTEM.…”

Section: Wt%)mentioning

confidence: 99%

Investigation on the Stability of Supported Gold Nanoparticles

et al. 2013

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Abstract:The procedures leading to the preservation of catalytic performances of Au/ZrO 2 samples have been investigated. The three potential causes of deactivation, namely the particle growth by sintering of gold nanoparticles, the metal leaching and the formation of un-reactive species which inhibit the reaction, have been evaluated. In particular, this paper deals with the stability of gold nanoparticles: (1) under storage conditions; (2) with time on stream for a gas phase reaction (LT-WGSR); (3) with time on stream for a liquid phase reaction (furfural oxidative esterification).

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Festphasen‐Alkoholoxidation mittels Direkter Mechanokatalyse

Wohlgemuth,

Schmidt,

Mayer

et al. 2024

Angewandte Chemie

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This paper presents a novel approach for the selective oxidation of alcohols to their corresponding aldehydes through direct mechanocatalysis, employing a gold‐coated milling vessel as catalyst and air as the oxidation agent. By adjusting milling frequency, media, and duration, high catalytic efficiencies and selectivities are achieved. Remarkably, yields of up to 99% are obtained for specific substrates, with a turnover number (TON) of 8200 and a turnover frequency (TOF) of 0.77 s‐1, surpassing existing alternatives. Confirmation of the catalytic reaction indeed occurring on the milling tool surface was achieved through X‐ray photoelectron spectroscopy (XPS).

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Au/ZrO2: an efficient and reusable catalyst for the oxidative esterification of renewable furfural

Cited by 81 publications

References 18 publications

Advances in Base-Free Oxidation of Bio-Based Compounds on Supported Gold Catalysts

Advances in Base-Free Oxidation of Bio-Based Compounds on Supported Gold Catalysts

Investigation on the Stability of Supported Gold Nanoparticles

Festphasen‐Alkoholoxidation mittels Direkter Mechanokatalyse

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