Insights into the stability of gold nanoparticles supported on metal oxides for the base-free oxidation of glucose to gluconic acid

Wang, Yuran; Vyver, Stijn Van de; Sharma, Krishna K.; Román‐Leshkov, Yuriy

doi:10.1039/c3gc41362d

Cited by 97 publications

(74 citation statements)

References 46 publications

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“…To conclude, the oxidation in a base-free medium is quite challenging, and there is still a need to enhance the efficiency of the catalysts used at low pH. Gold NPs-based catalysts permit to obtain high efficiencies in neutral or low pH conditions [44,45]. Table 1 summarizes the previous reports on base-free glucose oxidation on supported Au NPs catalysts.…”

Section: Supported Au-based Catalystsmentioning

confidence: 99%

“…The adsorption of different reactive species on the catalyst surface could also be responsible for the reversible deactivation of the catalyst. However, this adsorption could be removed by the calcination of the used catalyst (preferentially at 325 • C under static air) [44]. The base-free oxidation of glucose using microwave heating was studied by Rautiainen et al [45].…”

Section: Supported Au-based Catalystsmentioning

confidence: 99%

“…Wang et al [44] studied the stability of Au supported on metal oxides for the oxidation of glucose without base addition. Reactions were carried out at 65 • C and 0.23 MPa for 6 h with a glucose/Au molar ratio of 140.…”

Section: Stabilitymentioning

confidence: 99%

“…The spent catalyst treated with an aqueous solution of NaOH at 90 • C could convert glucose up to 87%, which was close to the result obtained with the as-prepared catalyst, and excluded the effect of any alkaline residue. Wang et al [44] studied Au catalysts supported on nano-or micro-sized metal oxides in the base-free oxidation of glucose to gluconic acid. The pH of the reaction solution was kept uncontrolled or, in certain cases, lowered by the addition of a mineral acid.…”

Section: Supported Au-based Catalystsmentioning

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: Supported Au-based Catalystsmentioning

confidence: 99%

Section: Supported Au-based Catalystsmentioning

confidence: 99%

Section: Stabilitymentioning

confidence: 99%

Section: Supported Au-based Catalystsmentioning

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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“…Nonetheless, compound 13 is likely produced from the lactonization of a C7 molecule (reaction f in Scheme S1), indicating that although lactonization is feasible, the confining effects of the zeolite pores may limit this pathway for larger molecules. 34 Metal oxides with Brønsted basicity typically employed for aldol reactions, including MgO and hydrotalcite, 35 show EP conversions of less than 13% and selectivities of less than 18% (Table S1, entries [8][9][10][11][12]. In these systems, pyruvic acid produced by the hydrolysis of EP is expected to deactivate the basic sites.…”

Section: Scheme 1 Self-aldol Condensation Of Ethyl Pyruvate Catalyzementioning

confidence: 97%

Synthesis of Itaconic Acid Ester Analogues via Self-Aldol Condensation of Ethyl Pyruvate Catalyzed by Hafnium BEA Zeolites

2016

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Lewis acidic zeolites are used to synthesize unsaturated dicarboxylic acid esters via aldol condensation of keto esters. Hafnium-containing BEA (Hf-BEA) zeolites catalyze the condensation of ethyl pyruvate into diethyl 2-methyl-4-oxopent-2-enedioate and diethyl 2-methylene-4-oxopentanedioate (an itaconic acid ester analogue) with a selectivity of ca. 80% at ca. 60% conversion in a packed-bed reactor. The catalyst is stable for 132 h on stream, reaching a turnover number of 5110 molEP molHf –1. Analysis of the dynamic behavior of Hf-BEA under flow conditions and studies with Na-exchanged zeolites suggest that Hf(IV) open sites possess dual functionality for Lewis and Brønsted acid catalysis.

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Micro‐Bio‐Chemo‐Mechanical‐Systems: Micromotors, Microfluidics, and Nanozymes for Biomedical Applications

et al. 2021

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Wireless nano‐/micromotors powered by chemical reactions and/or external fields generate motive forces, perform tasks, and significantly extend short‐range dynamic responses of passive biomedical microcarriers. However, before micromotors can be translated into clinical use, several major problems, including the biocompatibility of materials, the toxicity of chemical fuels, and deep tissue imaging methods, must be solved. Nanomaterials with enzyme‐like characteristics (e.g., catalase, oxidase, peroxidase, superoxide dismutase), that is, nanozymes, can significantly expand the scope of micromotors’ chemical fuels. A convergence of nanozymes, micromotors, and microfluidics can lead to a paradigm shift in the fabrication of multifunctional micromotors in reasonable quantities, encapsulation of desired subsystems, and engineering of FDA‐approved core–shell structures with tuneable biological, physical, chemical, and mechanical properties. Microfluidic methods are used to prepare stable bubbles/microbubbles and capsules integrating ultrasound, optoacoustic, fluorescent, and magnetic resonance imaging modalities. The aim here is to discuss an interdisciplinary approach of three independent emerging topics: micromotors, nanozymes, and microfluidics to creatively: 1) embrace new ideas, 2) think across boundaries, and 3) solve problems whose solutions are beyond the scope of a single discipline toward the development of micro‐bio‐chemo‐mechanical‐systems for diverse bioapplications.

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Insights into the stability of gold nanoparticles supported on metal oxides for the base-free oxidation of glucose to gluconic acid

Cited by 97 publications

References 46 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

Synthesis of Itaconic Acid Ester Analogues via Self-Aldol Condensation of Ethyl Pyruvate Catalyzed by Hafnium BEA Zeolites

Micro‐Bio‐Chemo‐Mechanical‐Systems: Micromotors, Microfluidics, and Nanozymes for Biomedical Applications

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