Gold-containing Beta zeolite in base-free glucose oxidation – The role of Au deposition procedure and zeolite dopants

Wolska, Joanna; Walkowiak, Adrian; Sobczak, Izabela; Wolski, Łukasz; Ziółek, Maria

doi:10.1016/j.cattod.2021.05.020

Cited by 12 publications

(19 citation statements)

References 52 publications

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“…Two bands at ca 1737 and 1777 cm −1 are present only after adsorption of glucose on Au/NH 2 /MCM-36 and Au/NH 2 /HBeta. The same bands were previously observed in the spectra of gold-zeolites after glucose oxidation and were assigned to C=O stretching vibrations in the reaction product-gluconic acid [17]. In the ATR study in this work, the oxidation of glucose cannot be considered, but the above-mentioned bands can be assigned to chemisorption of glucose.…”

Section: Influence Of Zeolite Support On the Activity Of Gold Catalystssupporting

confidence: 80%

“…In the ATR study in this work, the oxidation of glucose cannot be considered, but the above-mentioned bands can be assigned to chemisorption of glucose. Such a chemisorption with the participation of protons and water had been proposed earlier [17] and the coordination of glucose-waterproton complex to the zeolite surface had been shown. The glucose-water-proton complex contains carboxyl groups whose C=O vibrations appear in the IR spectrum as the two, above-mentioned bands.…”

Section: Influence Of Zeolite Support On the Activity Of Gold Catalystssupporting

confidence: 59%

“…Since smaller gold particles should result, in general, in higher glucose conversion than that observed for the catalysts with larger gold particles [15], one can expect that a lower glucose conversion in the presence of Au/B/MCM-36 containing smaller Au NPs can be assigned to the lower strength of acid sites. According to previous reports [17,40,41], BAS can play an important role in transformation of glucose molecule to geminal 1,1-diol (hydrate), which is then oxidized by active oxygen species adsorbed on gold particles. The stronger the BAS, the more labile the protons, and thus, the more efficient the protonation of glucose molecule to form gem-diol.…”

Section: Influence Of Zeolite Support On the Activity Of Gold Catalystsmentioning

confidence: 96%

“…As concerns sugars oxidation, the BAS on the catalyst surface are able to protonate glucose molecules making them more susceptible to oxidation [16]. Recently [17], we have postulated that the first step of the base-free glucose oxidation on gold supported on Beta zeolite is the protonation of the carbonyl oxygen (at carbon atom C1) in the glucose molecule, in which the BAS of the zeolite support take part. It has been indicated that the chemisorption of glucose on BAS is not the rate limiting step of the reaction, but the strength of BAS determines the selectivity of the reaction.…”

Section: Introductionmentioning

confidence: 99%

“…Oxygen chemisorption on Au NPs and/or its interaction with chemisorbed glucose has been postulated as limiting the total reaction rate. The role of the Au NPs size in glucose oxidation has been stressed in many papers and it has been indicated that the optimal gold particle size (to ensure the highest glucose conversion) is ca 7 nm [18] or 9 nm [9,19] for gold supported on carbons and on zeolites [17]. The Au NPs of this size have also been identified as the most active in glucose oxidation on AuPd supported on titanate nanotubes [20].…”

Section: Introductionmentioning

confidence: 99%

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Modification of Gold Zeolitic Supports for Catalytic Oxidation of Glucose to Gluconic Acid

et al. 2021

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Activity of gold supported catalysts strongly depends on the type and composition of support, which determine the size of Au nanoparticles (Au NPs), gold-support interaction influencing gold properties, interaction with the reactants and, in this way, the reaction pathway. The aim of this study was to use two types of zeolites: the three dimensional HBeta and the layered two-dimensional MCM-36 as supports for gold, and modification of their properties towards the achievement of different properties in oxidation of glucose to gluconic acid with molecular oxygen and hydrogen peroxide. Such an approach allowed establishment of relationships between the activity of gold catalysts and different parameters such as Au NPs size, electronic properties of gold, structure and acidity of the supports. The zeolites were modified with (3-aminopropyl)-trimethoxysilane (APMS), which affected the support features and Au NPs properties. Moreover, the modification of the zeolite lattice with boron was applied to change the strength of the zeolite acidity. All modifications resulted in changes in glucose conversion, while maintaining high selectivity to gluconic acid. The most important findings include the differences in the reaction steps limiting the reaction rate depending on the nature of the oxidant applied (oxygen vs. H2O2), the important role of porosity of the zeolite supports, and accumulation of negative charge on Au NPs in catalytic oxidation of glucose.

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Section: Influence Of Zeolite Support On the Activity Of Gold Catalystssupporting

confidence: 80%

Section: Influence Of Zeolite Support On the Activity Of Gold Catalystssupporting

confidence: 59%

Section: Influence Of Zeolite Support On the Activity Of Gold Catalystsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modification of Gold Zeolitic Supports for Catalytic Oxidation of Glucose to Gluconic Acid

et al. 2021

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Insight into the Role of the Amino‐Organosilane Modifier in Improving the Catalytic Activity of ZnO‐Supported Gold Species in Base‐Free Oxidation of Benzyl Alcohol

Wolski,

Sobańska,

Wolska

et al. 2023

ChemCatChem

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Understanding the factors that affect the reactivity of gold nanoparticles (Au NPs) in the catalytic oxidation of organic compounds remains an important issue. Of particular significance is tuning the effect of metal‐support interaction toward improving the catalytic performance of Au NPs. The main goal of this study is to provide new insight into the role of the amino‐organosilane (APMS) modifier, used for anchoring of gold species on ZnO support, in controlling the reactivity of Au NPs in H2O2 activation and the subsequent catalytic oxidation of benzyl alcohol. This study reveals that APMS modifier weakens the electronic interaction between ZnO and Au NPs, leading to a lower catalase‐like activity toward H2O2 in comparison to that observed for modifier‐free gold catalyst of similar size of nanoparticles. As a result, a slower rate of oxygen evolution resulted in higher activity in the oxidation of benzyl alcohol and enabled more efficient utilization of H2O2 under base‐free conditions. No radical species were formed during the oxidation reaction, and molecular oxygen formed in situ in the reaction medium was the primary oxidant responsible for the catalytic conversion of benzyl alcohol.

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A survey of recent progress on novel catalytic materials with precise crystalline structures for oxidation/hydrogenation of key biomass platform chemicals

Yang

Liu

Zhao

et al. 2021

EcoMat

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In the global attempt to reduce carbon footprint toward sustainability, the chemical and petrochemical industry faces the problem to replace the fossil feedstock with renewable resources, reduce energy consumption and to intensify and integrate the processes to be more carbon efficient. Biomass containing plentiful and renewable carbon resources is regarded to be a desired alternative for fossil fuel. Recently, research community has paid remarkable attention to develop the catalytic processes to produce fuels and chemicals from lignocellulosic biomass. This review surveys the recent advances of several representative novel catalytic materials with precise crystalline structures for key biomass platform chemicals (glucose, levulinic acid, 5‐hydroxymethylfurfural, and furfural) conversion processes, including oxidation, hydrogenation, and cascade reactions. The mechanistic reaction pathways are discussed, as well as the active sites and catalyst design. Additionally, the challenges and opportunities in this particular area is projected and shared with the community.image

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Gold-containing Beta zeolite in base-free glucose oxidation – The role of Au deposition procedure and zeolite dopants

Cited by 12 publications

References 52 publications

Modification of Gold Zeolitic Supports for Catalytic Oxidation of Glucose to Gluconic Acid

Modification of Gold Zeolitic Supports for Catalytic Oxidation of Glucose to Gluconic Acid

Insight into the Role of the Amino‐Organosilane Modifier in Improving the Catalytic Activity of ZnO‐Supported Gold Species in Base‐Free Oxidation of Benzyl Alcohol

A survey of recent progress on novel catalytic materials with precise crystalline structures for oxidation/hydrogenation of key biomass platform chemicals

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