The effects of gold nanosize for the exploitation of furfural by selective oxidation

Pinna, Francesco; Olivo, Alberto; Trevisan, Valentina; Menegazzo, Federica; Signoretto, Michela; Manzoli, Maela; Boccuzzi, F.

doi:10.1016/j.cattod.2012.01.033

Cited by 70 publications

(66 citation statements)

References 20 publications

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“…It has been shown [4] that furfural can be converted to methyl furoate under mild conditions by an oxidative esterification with NaCH 3 O and CH 3 OH on the Au/TiO 2 reference catalyst purchased from the World Gold Council (WGC) [6]. Very recently we have observed [7] good catalytic performances during esterification of furfural over a gold-supported sulphated zirconia support, especially when compared with the Au/TiO 2 reference catalyst.…”

Section: Introductionmentioning

confidence: 86%

Oxidative esterification of renewable furfural on gold-based catalysts: Which is the best support?

Menegazzo

Signoretto

Pinna

et al. 2014

Journal of Catalysis

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Gold based catalysts over different supports were investigated in the oxidative esterification of furfural by employing an efficient and sustainable process. The catalytic performances follow the trend: Zirconia-Au > Ceria-Au > > Titania-Au. Zirconia came out to be the best support option to promote activity, selectivity and also stability. The chemical and morphological properties observed for zirconia supported sample seem to fulfil a good compromise between high gold dispersion and the presence of suitable acid-base properties, for good selectivity. Moreover, stability and recycling of the catalysts were also investigated.

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Section: Introductionmentioning

confidence: 86%

Oxidative esterification of renewable furfural on gold-based catalysts: Which is the best support?

Menegazzo

Signoretto

Pinna

et al. 2014

Journal of Catalysis

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“…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%

“…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]. The effect of calcination on the catalytic activity was also evaluated [82,83,85].…”

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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“…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%.…”

Section: Scheme 1 Furfural Oxidative Esterification To Methyl Furoatementioning

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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The effects of gold nanosize for the exploitation of furfural by selective oxidation

Cited by 70 publications

References 20 publications

Oxidative esterification of renewable furfural on gold-based catalysts: Which is the best support?

Oxidative esterification of renewable furfural on gold-based catalysts: Which is the best support?

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

Investigation on the Stability of Supported Gold Nanoparticles

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