Influence of stabilisers on the catalytic activity of supported Au colloidal nanoparticles for the liquid phase oxidation of glucose to glucaric acid: understanding the catalyst performance from NMR relaxation and computational studies

Monti, Enrico; Ventimiglia, Alessia; Forster, Luke; Rodríguez‐Aguado, Elena; Cecilia, Juan Antonio; Ospitali, Francesca; Tabanelli, Tommaso; Albonetti, Stefania; Cavani, Fabrizio; Rivalta, Ivan; D’Agostino, Carmine; Dimitratos, Nikolaos

doi:10.1039/d2gc04418h

Cited by 8 publications

(7 citation statements)

References 82 publications

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“…PVP has been used as stabilizing agent to form spherical nanoparticles via in situ reduction [ 29 ], or to yield ginger-like Au nanobranches in PVP–SDS aqueous solution under microwave irradiation [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Morphological Effects of Au Nanoparticles on Electrochemical Sensing Platforms for Nitrite Detection

Feng

Fang

et al. 2023

Molecules

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Au nanoparticles were synthesized in a soft template of pseudo-polyanions composed of polyvinylpyrrolidone (PVP) and sodium dodecyl sulfate (SDS) by the in situ reduction of chloroauric acid (HAuCl4) with PVP. The particle sizes and morphologies of the Au nanoparticles were regulated with concentrations of PVP or SDS at room temperature. Distinguished from the Au nanoparticles with various shapes, Au nanoflowers (AuNFs) with rich protrusion on the surface were obtained at the low final concentration of SDS and PVP. The typical AuNF synthesized in the PVP (50 g·L−1)–SDS (5 mmol·L−1)–HAuCl4 (0.25 mmol·L−1) solution exhibited a face-centered cubic structure dominated by a {111} crystal plane with an average equivalent particle size of 197 nm and an average protrusion height of 19 nm. Au nanoparticles with four different shapes, nanodendritic, nanoflower, 2D nanoflower, and nanoplate, were synthesized and used to modify the bare glassy carbon electrode (GCE) to obtain Au/GCEs, which were assigned as AuND/GCE, AuNF/GCE, 2D-AuNF/GCE, and AuNP/GCE, respectively. Electrochemical sensing platforms for nitrite detection were constructed by these Au/GCEs, which presented different detection sensitivity for nitrites. The results of cyclic voltammetry (CV) demonstrated that the AuNF/GCE exhibited the best detection sensitivity for nitrites, and the surface area of the AuNF/GCE was 1.838 times of the bare GCE, providing a linear c(NO2−) detection range of 0.01–5.00 µmol·L−1 with a limit of detection of 0.01 µmol·L−1. In addition, the AuNF/GCE exhibited good reproducibility, stability, and high anti-interference, providing potential for application in electrochemical sensing platforms.

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Section: Resultsmentioning

confidence: 99%

Morphological Effects of Au Nanoparticles on Electrochemical Sensing Platforms for Nitrite Detection

Feng

Fang

et al. 2023

Molecules

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“…This work is especially focused on a comparison between the catalytic activities of Au nanoparticles, prepared through sol-immobilization using three different commercial polymers as stabilizer agents: polyvinylpyrrolidone (PVP), polyethylene glycol (PEG) and polyvinyl alcohol (PVA). These three polymers have different structural properties, thus each stabilizer affects the preparation of the supported NPs and, particularly, the catalytic performance as has been shown previously [47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 85%

“…The colloidal suspensions of gold were immobilized on activated carbon and the synthesized catalysts were identified by a name such as "Au/AC_PVA_0.3", specifying firstly the catalyst, secondly the stabilizing polymer, and lastly the Au/Polymer weight ratio. All the final fresh and used catalysts were completely characterized in previous works [47,49,50] using different techniques such as UV-Vis spectroscopy, XRD, DLS, ELS, XPS and TEM, and the data are reported in the Supplementary Information (from Figures S1-S14 and Tables S1-S3). A new characterization of the spent catalysts for the studied reaction is presented in the section concerning the reusability of the samples.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

“…List of all the tested catalysts along with their characteristics: type of stabilizing agent, polymer:Au weight ratio, TEM mean nanoparticle size and percentage of Au on the catalyst surface obtained from XPS analysis. The series of selected catalysts have been characterized extensively and the results have been discussed in detail in our previous studies using a number of characterization techniques [47]. The DLS and ELS analyses, reported in Figures S13 and S14, show different trends depending on the choice of capping agent.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

“…As a model system for Au NPs, an Au 55 amorphous cluster [58], with a size of ca. 1 nm was employed, since it was successfully used in a previous study on glucose oxidation reaction [47]. The adsorption of the three polymeric stabilizers was studied by considering the adsorption of their monomeric units.…”

Section: Interaction Between Stabilizing Agents and Au Nps: A Computa...mentioning

confidence: 99%

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Effect of Capping Ligands for the Synthesis of Gold Nanoparticles and on the Catalytic Performance for the Oxidation of 5-Hydroxymethyl-2-furfural

et al. 2023

Self Cite

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Different series of Au on carbon catalysts were prepared via sol-immobilization to investigate the role of polymers (polyvinylpyrrolidone PVP, polyethylene glycol PEG and polyvinyl alcohol PVA), employed as gold nanoparticle (NP) stabilizers, on catalyst properties and on catalytic activity. The synthesized materials were widely characterized with several techniques (DLS, XRD, TEM and XPS) and used as catalysts in the 5-hydroxymethylfurfural (HMF) oxidation to produce 2,5-furandicarboxylic acid (FDCA). The obtained results clearly demonstrated the PVA leading to the formation of smaller and more active NPs. On the contrary, polyethylene glycol was shown to affect gold exposure and, as a consequence, to reduce the catalyst activity due to steric effects while PVP-based catalysts presented bigger and more covered Au NPs. The investigation on the reusability of the catalysts demonstrated the presence of a significant deactivation on all prepared materials, but the presence of higher amounts of polymer seems to have a positive effect on catalyst stability even if associated with lower reactivity. Computational studies have provided interesting information on the NP-polymer interactions and consequently on the catalytic activities.

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Enhancing gluconic acid selectivity in catalytic oxidation: the synergetic effect of glucose-fructose mixtures and kinetic insights

Lima,

Biajante,

Bina

et al. 2024

Braz. J. Chem. Eng.

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Influence of stabilisers on the catalytic activity of supported Au colloidal nanoparticles for the liquid phase oxidation of glucose to glucaric acid: understanding the catalyst performance from NMR relaxation and computational studies

Abstract: Impact of stabilisers on the catalytic performance of supported Au colloidal nanoparticles for the liquid phase oxidation of glucose to glucaric acid.

Cited by 8 publications

References 82 publications

Morphological Effects of Au Nanoparticles on Electrochemical Sensing Platforms for Nitrite Detection

Morphological Effects of Au Nanoparticles on Electrochemical Sensing Platforms for Nitrite Detection

Effect of Capping Ligands for the Synthesis of Gold Nanoparticles and on the Catalytic Performance for the Oxidation of 5-Hydroxymethyl-2-furfural

Enhancing gluconic acid selectivity in catalytic oxidation: the synergetic effect of glucose-fructose mixtures and kinetic insights

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