Selective oxidation of alcohols over Ag-containing Si3N4 catalysts

Vodyankina, O. V.; Блохина, А. С.; Курзина, И. А.; Соболев, В. И.; Koltunov, Konstantin Yu.; Чухломина, Л. Н.; Двилис, Э.С.

doi:10.1016/j.cattod.2012.02.056

Cited by 23 publications

(13 citation statements)

References 20 publications

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“…Moreover, a chemical composition of the support surface including functional groups of different nature (acid-base or redox) can also influence on the state of active component. In our previous work [57] we showed that the impurities of Fe in the Si 3 N 4 support, which was prepared by self-propagating high-temperature synthesis from Fe-Si alloy, influence on the surface redox properties of Ag/Si 3 N 4 and are a part of bifunctional active species in selective oxidation of ethanol. Thus, both redox and acid-base properties of the support affect the catalytic properties of the supported silver NPs.…”

Section: Ethanolmentioning

confidence: 99%

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: Ethanolmentioning

confidence: 99%

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

et al. 2018

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“…However, the electrolytic Ag is costly and only active at 500–600 °C, achieving 70–80 % conversion with 80–90 % AC selectivity ,. Ag nanocatalysts may be a promising alternative, achieving, for example, 70 % AC yield over 2 wt % Ag/Al 2 O 3 at 280 °C, but suffer from sintering of Ag NPs, which usually leads to a remarkable catalyst deactivation . Pd and Pt NPs are highly active for aqueous‐phase EtOH oxidation,, but suffer from poor gas‐phase selectivity and require high reaction temperatures.…”

Section: Figurementioning

confidence: 99%

Reaction‐Induced Self‐Assembly of CoO@Cu₂O Nanocomposites In Situ onto SiC‐Foam for Gas‐Phase Oxidation of Bioethanol to Acetaldehyde

et al. 2017

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A high-performance SiC-foam-structured nanocomposite catalyst of CoO@Cu O (i.e., 50-100 nm CoO partially covered with ca. 10 nm Cu O) was engineered from nano- to macro-scales in one step for the high-throughput gas-phase aerobic oxidation of bioethanol to acetaldehyde. This special CoO@Cu O nanostructure shows much higher activity/selectivity than other binary metal-oxide assemblies such as CuO &CoO nano-mixtures or inverse Cu O@CoO nanostructures. The catalyst was facilely but exclusively obtainable by in situ reaction-induced transformation of the respective metal nitrates supported on SiC-foam into the CoO@Cu O nanostructure in the reaction stream. It achieved 95 % conversion with 98 % selectivity under mild conditions and was stable for at least 150 h for a feed of 20 vol % ethanol (much higher than in the literature: 1-6 vol %) at a high EtOH weight hourly space velocity of 8.5 h . Abundant Cu O-CoO interfaces and high stability of the CoO@Cu O nanostructure were responsible for the high activity/selectivity and promising stability in this reaction.

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“…Due to specific features of preparation of the silicon nitride sample used in this study and prepared by self propagating high temperature synthesis with the combustion of FeSi 2 in an N 2 atmosphere, the sample contains 0.02-1.15 wt % iron. Introducting silver onto the surface of Fe containing Si 3 N 4 brings the selectivity for acetaldehyde up to 95% with com plete alcohol conversion at 300°С [4,5]. It was also shown that the introduction of silver improves the reactivity of Fe containing Si 3 N 4 in the hydrogen oxi dation reaction [5].…”

Section: Introductionmentioning

confidence: 98%

“…Introducting silver onto the surface of Fe containing Si 3 N 4 brings the selectivity for acetaldehyde up to 95% with com plete alcohol conversion at 300°С [4,5]. It was also shown that the introduction of silver improves the reactivity of Fe containing Si 3 N 4 in the hydrogen oxi dation reaction [5].…”

Section: Introductionmentioning

confidence: 99%

Formation of the active surface of Ag/SiO2 catalysts in the presence of FeO x additives

Savel’eva

Vodyankina

2014

Russ. J. Phys. Chem.

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Supported FeO x modified silver catalysts based on commercial silica gel and prepared via impreg nation with a solution of Fe and Ag containing salts while varying the amount of modifier from 1 to 10 wt % are studied. It is found that the introduction of Fe containing compounds leads to the distribution of silver in the form of clusters/ions on the surface of SiO 2 , improving the reducibility of the systems in the H 2 TPR mode. After reduction at 800°C, the catalysts containing 10 wt % iron and 5 wt % silver comprise a Fe 2 SiO 4 iron silicate phase.

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Selective oxidation of alcohols over Ag-containing Si3N4 catalysts

Cited by 23 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

Reaction‐Induced Self‐Assembly of CoO@Cu₂O Nanocomposites In Situ onto SiC‐Foam for Gas‐Phase Oxidation of Bioethanol to Acetaldehyde

Formation of the active surface of Ag/SiO2 catalysts in the presence of FeO x additives

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Selective oxidation of alcohols over Ag-containing Si3N4 catalysts

Cited by 23 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

Reaction‐Induced Self‐Assembly of CoO@Cu2O Nanocomposites In Situ onto SiC‐Foam for Gas‐Phase Oxidation of Bioethanol to Acetaldehyde

Formation of the active surface of Ag/SiO2 catalysts in the presence of FeO x additives

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Reaction‐Induced Self‐Assembly of CoO@Cu₂O Nanocomposites In Situ onto SiC‐Foam for Gas‐Phase Oxidation of Bioethanol to Acetaldehyde