Catalytic activity of electrospun Ag and Ag/carbon composite fibres in partial methanol oxidation

Halperin, Victor; Shter, Gennady E.; Gel'man, V. N.; Peselev, D. M.; Mann‐Lahav, Meirav; Grader, Gideon S.

doi:10.1039/c4cy01341g

Cited by 24 publications

(14 citation statements)

References 16 publications

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“…It is noteworthy that a significant reduction of the process temperature for Ag catalysts without the addition of the second metal (e.g., Pt) was not yet achieved, which is connected with a weak adsorption of methanol over the silver surface and difficulties in the C-H bond cleavage in the methanol molecule as compared to other alcohols. Addition of Pt into the composition of PtAg/NbMCF-M catalyst provided the highest selectivity towards formaldehyde (53%) at 85% methanol conversion (200 • C), i.e., the impact of total oxidation of alcohol is high [31,32].…”

Section: Methanolmentioning

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: Methanolmentioning

confidence: 99%

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

et al. 2018

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“…Among these methods, the electrospinning (ES) process is of great importance due to the advantages of materials that can be utilized by it. For example, this method enables synthesis of fibers with large surface‐to‐volume ratio and mesoporous structure for various catalytic applications . In addition, ES is an attractive way to produce high‐surface‐area fibers with diameters in the nano–micrometer range and nonwoven nanofiber mats, with unique properties …”

Section: Introductionmentioning

confidence: 99%

Electrospun Ionomeric Fibers with Anion Conducting Properties

Mann‐Lahav

Halabi

Shter

et al. 2019

Adv Funct Materials

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Anion conductive nanofiber mats from FAA-3 ionomers are obtained by electrospinning. Depending on the solvent used in the precursor solution, nanofibers with either nonhollow cylindrical or flat ribbon-like cross-sections are prepared. The anion conductivity and water uptake of the ionomeric nanofiber mats are measured as a function of the relative humidity in the 10-90% range and compared to that of a solid membrane cast from the same ionomer. In addition, the anion conductivity of an isolated single fiber of the ionomer is measured for the first time. The anion conductivity of the electrospun single fiber is found to be higher than that of the mats, which is, in turn, one order of magnitude higher than that of the solid ionomer membrane. The higher conductivity of the mats relative to the solid membrane (in both inplane and through-plane directions) is found to be related to the variation in water uptake, which stems from the morphological distinctions. These results increase the understanding of the electrospinning process of ionomers, toward the development and design of new anion conductive ionomer fibers, useful for high performance electrochemical devices.

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“…There exists a number of theoretical and experimental studies on methanol partial oxidation on silver catalysts. Nevertheless, many aspects of the process, like the rate limiting step and the actual reaction path, still remain elusive.…”

Section: Introductionmentioning

confidence: 99%

“…The process on the silver catalyst takes place at 800-900 Ku nder atmospheric pressure [3,4] and usually produces formaldehyde with ac onversion in excesso f90%. [2] There exists an umber of theoretical [5][6][7] and experimental studies [8][9][10][11] on methanolp artial oxidation on silver catalysts. Nevertheless, many aspects of the process,l ike the rate limiting step and the actual reactionp ath, still remain elusive.…”

Section: Introductionmentioning

confidence: 99%

Methanol Partial Oxidation on Ag(1 1 1) from First Principles

et al. 2016

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In this work, we examine the thermochemistry and kinetics of the partial oxidation of methanol to formaldehyde on silver surfaces. Periodic density functional theory calculations employing the BEEF‐vdW functional are used to identify the most stable phases of the silver surface under relevant reaction conditions and the reaction energetics are obtained on these surfaces. The calculated binding energies and transition state energies are used as input in a mean‐field microkinetic model providing the reaction kinetics on silver surfaces under different reaction conditions. Our results show that, under conditions pertaining to methanol partial oxidation, oxygen is present at low concentrations and it plays a critical role in the catalytic reaction. Surface oxygen promotes the reaction by activating the OH bond in methanol, thus forming a methoxy intermediate, which can react further to form formaldehyde. The dissociation of molecular oxygen is identified as the most critical step.

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Catalytic activity of electrospun Ag and Ag/carbon composite fibres in partial methanol oxidation

Abstract: A feasibility of electrospinning in producing of highly active Ag and Ag/carbon fibres based catalysts is demonstrated in methanol partial oxidation process (PMO).

Cited by 24 publications

References 16 publications

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

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

Electrospun Ionomeric Fibers with Anion Conducting Properties

Methanol Partial Oxidation on Ag(1 1 1) from First Principles

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