Influence of the preparation conditions on the properties of gold catalysts for the oxidation of glucose

Baatz, Christine; Thielecke, Nadine; Prüße, Ulf

doi:10.1016/j.apcatb.2006.01.020

Cited by 78 publications

(55 citation statements)

References 16 publications

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“…3(B)a-f, respectively) appear very similar to the bare TiO 2 sample (Fig. 3(A)e and f), indicating that the small content of PW 11 or PW 12 did not modify the morphology of the majority component TiO 2 . From the perusal of Fig.…”

Section: CMmentioning

confidence: 57%

“…50 nm). Table 1 reports the nominal and the average EDAX values of atomic percentage of W in PW 11 or PW 12 and the atomic percentage of Ti in the TiO 2 . EDAX measurements conrmed a homogeneous content of the HPAs onto the catalyst with the exception of the PW 12 /P25 sample where tungsten was present in some agglomerates in much higher content with respect to the nominal one.…”

Section: CMmentioning

confidence: 99%

“…Metal catalysts as Pt, Pd, Rh, Bi or Pb supported on TiO 2 , Al 2 O 3 or activated carbon have been used as catalysts but Au seems to be the most promising one. [11][12][13][14][15] Gold nanoparticles supported on activated carbon 16 or ZrO 2 (ref. 17) showed good catalytic activity for oxidation of glucose to gluconic acid at 50 C in the presence of O 2 at pH's ranging between 8 and 10.…”

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confidence: 99%

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Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid–TiO₂ composites

et al. 2015

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Commercial and home prepared TiO 2 samples were functionalized with a commercial Keggin heteropolyacid (HPA) H 3 PW 12 O 40 (PW 12 ) or with a hydrothermally home prepared K 7 PW 11 O 39 salt (PW 11 ).All the materials were characterized by specific surface area measurements (BET), XRD analyses, Raman, DRS along with SEM observations and they have been used for glucose photocatalytic conversion in an aqueous suspension. Different reaction extents and distribution of intermediate oxidation products were observed depending on the photocatalyst. Gluconic acid, arabinose, erythrose and formic acid were observed as oxidation products when bare TiO 2 or HPA/TiO 2 composite materials were used. Glucose isomerization to form fructose was also observed and in some runs traces of glucaric acid and glyceraldehyde were also found. The carbon mass balance was accomplished in the presence of the commercial Evonik P25 TiO 2 powder and the composites where TiO 2 was present, whereas the presence of the solvothermically prepared TiO 2 gave rise to a carbon unbalance, due to strong adsorption of the products on the photocatalyst surface. No reactivity was observed in the presence of PW 12 alone while PW 11 induced only isomerization of the glucose.

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Section: CMmentioning

confidence: 57%

Section: CMmentioning

confidence: 99%

mentioning

confidence: 99%

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Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid–TiO₂ composites

et al. 2015

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“…Comotti et al [24,34] reported high activity and selectivity towards gluconic acid using unsupported Au nanoparticles (NPs). However, these systems showed relatively low stability [35], which was improved by immobilization on carbon [23,26].…”

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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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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“…An effect of the support for the reaction was found by Ishida et al [20] comparing catalysts supported on metal oxides (TiO 2 , CeO 2 , ZrO 2 and Al 2 O 3 ) and one supported on C. The stability of the catalyst was proven by Baatz et al [21] who recycled 20 times at 40˝C an Au/Al 2 O 3 catalyst and from Mirescu et al [22] who recycled 17 times at 40˝C an Au/TiO 2 catalyst. In the present paper it was investigated the oxidation of glucose.…”

Section: Introductionmentioning

confidence: 76%

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

et al. 2016

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Abstract:New gold catalysts supported on CeO 2 , ZrO 2 and TiO 2 were synthesized by two different techniques: deposition-precipitation and colloidal method. The role of the surfactant (PVA, PVP, THPC) was also investigated. The catalysts were tested in the oxidation of glucose to gluconic acid, in aqueous environment and under mild conditions (60˝C and atmospheric pressure). TEM and SEM analyses have shown that the small size of gold nanoparticles is a necessary condition, but not sufficient for a good conversion. In fact, for an active sample, we have verified that the excess of surfactant must be removed because it would coat the surface of the catalyst. The surfactant, however, should not be completely eliminated, since it has the fundamental role of stabilizing the sample preventing nanoparticles from aggregation. It was evidenced that both the synthetic approach and the kind of support affect the catalysts' activity. In fact, by focusing on the three different supports, with all the preparation methods, the ceria has proved to be the best support. This is due to its ability to obtain small gold nanoparticles and to its ability to accumulate oxygen. The most appropriate synthesis methodology proved to be the colloidal method with PVA. Recyclability issue was investigated too.

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Influence of the preparation conditions on the properties of gold catalysts for the oxidation of glucose

Cited by 78 publications

References 16 publications

Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid–TiO₂ composites

Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid–TiO₂ composites

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

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

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Influence of the preparation conditions on the properties of gold catalysts for the oxidation of glucose

Cited by 78 publications

References 16 publications

Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid–TiO2 composites

Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid–TiO2 composites

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

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

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Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid–TiO₂ composites

Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid–TiO₂ composites