Structure sensitivity and kinetics of ?-glucose oxidation to ?-gluconic acid over carbon-supported gold catalysts

Önal, Yücel; Schimpf, Sabine; Claus, Peter

doi:10.1016/j.jcat.2004.01.010

Cited by 264 publications

(108 citation statements)

References 18 publications

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“…However, these systems showed relatively low stability [35], which was improved by immobilization on carbon [23,26]. Önal et al [36] also studied Au NPs supported on carbon ( Figures 2 and 3); however, the selectivity towards the desired acid was quite low at high conversions. Önal et al [36] also studied Au NPs supported on carbon ( Figures 2 and 3); however, the selectivity towards the desired acid was quite low at high conversions.…”

Section: Supported Au-based Catalystsmentioning

confidence: 99%

“…However, these systems showed relatively low stability [35], which was improved by immobilization on carbon [23,26]. Önal et al [36] also studied Au NPs supported on carbon ( Figures 2 and 3); however, the selectivity towards the desired acid was quite low at high conversions. Taking into account this observation, the gold-support interaction was declared to play a crucial role in the formation of a stable catalytic system [37][38][39].…”

Section: Supported Au-based Catalystsmentioning

confidence: 99%

See 1 more Smart Citation

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: Supported Au-based Catalystsmentioning

confidence: 99%

“…However, these systems showed relatively low stability [35], which was improved by immobilization on carbon [23,26]. Önal et al [36] also studied Au NPs supported on carbon ( Figures 2 and 3); however, the selectivity towards the desired acid was quite low at high conversions. Taking into account this observation, the gold-support interaction was declared to play a crucial role in the formation of a stable catalytic system [37][38][39].…”

Section: Supported Au-based Catalystsmentioning

confidence: 99%

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

et al. 2017

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“…However, Au nanoparticles with uniform size are rarely formed on active carbon due to their wide pore size distribution which provides a heterogeneously steric confinement for Au nucleation and deposition. [16][17][18] This diversity in Au particle size would inevitably lower the activity and selectivity of the Au catalyst. Besides, the micropores of the active carbons are also blocked easily by Au nanoparticles, which would hinder the diffusion of reactants and products in the pore texture of the active carbons.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous carbon-confined Au catalysts with superior activity for selective oxidation of glucose to gluconic acid

Xue

et al. 2013

Green Chem.

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A series of ordered mesoporous carbon (OMC)-supported Au catalysts were successfully prepared by nano-replication, followed by colloidal gold deposition method. Structural analysis showed that the mesopore sizes of the catalysts can be tuned controllably in the range of 3.2-7.6 nm by adjusting the dosage of boric acid used to prepare the carbon supports. TEM observations revealed that the Au nanoparticles were dispersed uniformly in the mesopore channels of the carbon supports. These Au/OMC catalysts were tested for the aerobic oxidation of glucose to produce gluconic acid at 40°C and pH 9. As demonstrated by the structural analysis and reaction results, the activities of these catalysts were closely related to their mesopore sizes. The catalyst with a mesopore size of 5.4 nm exhibited a superior catalytic activity with a TOF of 4.308 mol glucose mol Au −1 s −1 to the catalysts reported previously by other researchers. This high activity was mainly ascribed to its unique structure, consisting of 5.4 nm mesopore channels incorporated with 3.3 nm Au nanoparticles, which facilitates contact between glucose molecules and Au nanoparticles. Besides, the abundant active oxygen species existing on this catalyst surface also promote glucose oxidation.

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“…Samples were prepared by several techniques like DIM and LPRD [11], reduction with nitric acid [12] and sol immobilisation method [13]. The latter lead to the best results, as reported in literature for Au-activated carbon (AC) catalysts [14].…”

Section: Physical Chemistrymentioning

confidence: 98%

“…Using molecular oxygen, arabinoic acid could be synthesised from arabinose, D-arabino-1,4-lactone being found as an intermediary (Scheme 4). Preliminary results showed that MWCNTs (Nanocyl-NC3100) and carbon xerogel (CX, prepared by the resorcinol/formaldehyde approach [15]), loaded with 1 wt.% Au (by the sol method [13]) were used as catalysts. Au/CNT was less active than Au/CX.…”

Section: Organic Chemistrymentioning

confidence: 99%

Gold highlights on the 22nd Meeting of the Portuguese Society of Chemistry in Braga, Portugal, July 3–6, 2011

Carabineiro

2011

Gold Bull

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Structure sensitivity and kinetics of ?-glucose oxidation to ?-gluconic acid over carbon-supported gold catalysts

Cited by 264 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

Mesoporous carbon-confined Au catalysts with superior activity for selective oxidation of glucose to gluconic acid

Gold highlights on the 22nd Meeting of the Portuguese Society of Chemistry in Braga, Portugal, July 3–6, 2011

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