Adsorption and conversion of ethylene glycol on the surface of Ag-containing catalyst modified with phosphate

Mamontov, G. V.; Knyazev, A. S.; Паукштис, E. A.; Vodyankina, O. V.

doi:10.1134/s0023158413060086

Cited by 14 publications

(15 citation statements)

References 20 publications

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“…The next generation of the catalysts for the selective EG oxidation is connected with the development of the idea about the application of Ag clusters/NPs as active species able to adsorb oxygen in a strongly bounded form. Such an approach was implemented in our previous works [85][86][87][88][89], where the Ag-containing materials (5 wt%) were applied as catalysts instead of polycrystalline Ag. The active component in the form of Ag NPs was distributed in the mesoporous space of the silica matrix ( Figure 10) together with the polyphosphate modifier.…”

Section: Ethylene Glycolmentioning

confidence: 99%

“…The mechanism of selective EG oxidation was actively studied [88,96,97]. To determine the role of phosphate and silicate functional groups in the composition of the Ag-containing catalyst of new generation, Mamontov et al [88] compared the EG adsorption on the surfaces of Ag/SiO 2 and Ag/P 2 O 5 /SiO 2 catalysts before and after oxygen treatment using in-situ IR-spectroscopy. The nature and a concentration of the active species on the catalyst surface were determined by the low-temperature CO adsorption.…”

Section: Ethylene Glycolmentioning

confidence: 99%

“…Based on the data on the temperature dependence of EG adsorption it was shown that EG is predominantly adsorbed on the catalyst surface with the participation of the phosphate groups ( Figure 12). The kinetics of EG interaction with oxygen was investigated at 300 • C [88]. The adsorbed complexes of EG with silver ions and H-bonded complexes slowly decomposed in the presence of oxygen (for 5 min) on the oxidized Ag/P 2 O 5 /SiO 2 catalyst.…”

Section: Ethylene Glycolmentioning

confidence: 99%

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Ag-Based Catalysts in Heterogeneous Selective Oxidation of Alcohols: A Review

et al. 2018

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Alcohols (bioalcohols) is a class of chemicals that are used as a feedstock for the manufacturing of a large number of valuable intermediates in industrially important processes. Currently, sustainable technologies for selective conversion of alcohols utilize “green” oxidants, mainly, ambient air or oxygen. Due to the high affinity of oxygen towards silver, the latter serves as an active component of supported heterogeneous catalysts. In this review, we consider Ag-based catalysts that participate in gas- or liquid-phase oxidation of alcohols. Oxidation of methanol, ethanol, ethylene glycol, propylene glycol, glycerol, benzyl and allyl alcohols is mostly considered. A particular attention is paid to selective photooxidation of alcohols over Ag-based catalysts. We discuss the catalyst composition in terms of (1) the state of the active component, (2) the nature of the substrate, (3) support nature, and (4) the strength of the metal–support interactions.

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Section: Ethylene Glycolmentioning

confidence: 99%

Section: Ethylene Glycolmentioning

confidence: 99%

Section: Ethylene Glycolmentioning

confidence: 99%

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Ag-Based Catalysts in Heterogeneous Selective Oxidation of Alcohols: A Review

et al. 2018

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“…The silver containing catalyst was active in the oxi dation of CO already in the region of minus tempera tures: a 5% conversion of CO was achieved at temper atures of -28 and -20°C on the oxidized and reduced samples, respectively (a 98% conversion of CO on the silver catalyst was observed at 57 and 75°C, respec tively). The higher activity of the oxidized sample can be related to a higher concentration of Ag δ+ species on the surface of silver nanoparticles, which were formed upon interaction with oxygen and participated in the adsorption of CO [45,46]. Note that both oxidized and reduced samples were characterized by the two peak temperature dependence of CO conversion: the conversion of CO increased in a temperature range from -40 to 20°C; then, it sharply decreased and increased once again at temperatures higher than 25°C.…”

Section: Catalytic Properties In Co Oxidationmentioning

confidence: 99%

Role of PdAg interface in Pd-Ag/SiO2 bimetallic catalysts in low-temperature oxidation of carbon monoxide

Bondarchuk

Mamontov

2015

Kinet Catal

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An approach to the development of bimetallic nanoparticles with the separated but interacting phases of silver and palladium was proposed to effectively separate the active sites of silver, which possess high activity in activation of molecular oxygen, and the sites of palladium containing phases, which are responsi ble for CO adsorption. The structure of PdAg particles was determined using X ray diffraction analysis, elec tronic diffuse reflectance spectroscopy, and temperature programmed reduction. It was found that the intro duction of silver led to easier reduction of palladium from oxidized states in an atmosphere of CO. The activ ity of the bimetallic PdAg catalysts in the oxidation of CO increased, as compared with that of the Pd/SiO 2 catalyst. The oxidized bimetallic catalyst, in which palladium occurred in an oxide state, was even more effec tive in the oxidation of CO; this can be related to the better cooperation of the active sites of silver and palla dium oxide, which are responsible for the activation and conversion of CO and oxygen at the Ag-PdO inter facial boundary.

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“…Ion-exchange resins are very effective in catalyzing acetal formation [8,9]. The use of heterogeneous ion-exchange resin catalysts offers many advantages over homogeneous acidic catalyst.…”

Section: Introductionmentioning

confidence: 99%

The Nature of Acid-Catalyzed Acetalization Reaction of 1,2-Propylene Glycol and Acetaldehyde

Chen¹,

Chen²,

Li³

et al. 2015

Korean Chemical Engineering Research

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− We investigated catalytic activity of ion-exchange resins in acetalization of 1,2-propylene glycol with acetaldehyde. The impacts of reaction variables, such as temperature, reaction time, catalyst loading and feedstock composition, on the conversion of 1,2-propylene glycol were measured. The life of the catalyst was also studied. Furthermore, the reaction kinetics of 1,2-propylene glycol acetalization was studied. It was found that reaction rate followed the firstorder kinetics to acetaldehyde and 1,2-propylene glycol, respectively. Therefore, overall acetalization reaction should follow the second-order reaction kinetics, expressed as .

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Adsorption and conversion of ethylene glycol on the surface of Ag-containing catalyst modified with phosphate

Cited by 14 publications

References 20 publications

Ag-Based Catalysts in Heterogeneous Selective Oxidation of Alcohols: A Review

Ag-Based Catalysts in Heterogeneous Selective Oxidation of Alcohols: A Review

Role of PdAg interface in Pd-Ag/SiO2 bimetallic catalysts in low-temperature oxidation of carbon monoxide

The Nature of Acid-Catalyzed Acetalization Reaction of 1,2-Propylene Glycol and Acetaldehyde

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