Morphology and Activity of Electrolytic Silver Catalyst for Partial Oxidation of Methanol to Formaldehyde Under Different Exposures and Oxidation Reactions

Lervold, Stine; Arnesen, Kamilla; Beck, N. K.; Lødeng, Rune; Yang, Jia; Bingen, Kristin; Skjelstad, Johan; Venvik, Hilde J.

doi:10.1007/s11244-019-01159-0

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…This offers the opportunity to modify the catalytic properties of silver according to its required purpose. Some possibilities such as bimetallic silver-cobalt for glycerol electro-oxidation, 4 selective oxidation of ethylene to ethylene oxide using different silver catalysts, 13 and methanol to formaldehyde oxidation using polycrystalline silver catalyst 14 have been reported in literature. These materials exhibited enhanced catalytic activity for MOR thus encouraging further research into silver-based catalysts.…”

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confidence: 99%

Electrocatalytic Oxidation of Methanol Over Silver-Based Ag-M/C (M = Cu, Zn, Fe, Cr, Mn) Electrocatalysts Synthesized by Solution Combustion Technique

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Shafath

Kumar

et al. 2022

J. Electrochem. Soc.

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We report the electrocatalytic properties of Ag-M/C (M=Cu, Zn, Fe, Cr, Mn) catalysts synthesized using the solution combustion synthesis (SCS) method for methanol oxidation reaction (MOR). The morphological properties of the synthesized catalysts were studied using scanning electron microscopy, energy-dispersive X-ray microscopy, tunneling electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy (XPS) techniques. The results indicated that AgCu/C is the most porous catalyst with small and well distributed nanoparticles making it a suitable choice for electrocatalytic applications. The XPS results showed a shift in peak in the AgCu/C sample due to the charge transfer between Ag and Cu indicating a strong interaction in the compound. The electrochemical measurements in 1 M methanol with 1 M KOH electrolyte by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) revealed that AgCu/C showed high electrocatalytic activity for MOR. Further studies on AgCu/C for methanol concentrations of 0.5 M, 1 M, 1.5 M, 2.5 M to evaluate the rate dependency of the catalyst indicated a power-law dependency with an order of 0.55 on methanol concentration. According to chronoamperometry analysis, the catalyst was stable for at least 20 hours.

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confidence: 99%

Electrocatalytic Oxidation of Methanol Over Silver-Based Ag-M/C (M = Cu, Zn, Fe, Cr, Mn) Electrocatalysts Synthesized by Solution Combustion Technique

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Shafath

Kumar

et al. 2022

J. Electrochem. Soc.

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“…Other alternatives would be the formation of sub-surface gas molecules, e.g. O2, which causes porosity upon evaporation[155], which we find less likely.…”

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confidence: 85%

Interplay of valence states and magnetic interactions in the perovskite system LaNi1Rh O3

Fjellvåg

Kumar

et al. 2021

Journal of Solid State Chemistry

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“…These diagnostic approaches have been used extensively in combustion research. − We apply these techniques to the partial oxidation of methanol (CH 3 OH) catalyzed by polycrystalline silver (Ag). This heterogeneous catalysis reaction is an industrially relevant process used to produce formaldehyde, a valuable commodity chemical. − This reaction provides a convenient demonstration system because the Ag catalyst is easily prepared, and the desired product of formaldehyde (CH 2 O) is readily detected with PLIF imaging. This catalytic process also involves a more complex mixture of species than have been probed in many of the previous in situ measurements ( e.g., oxidation of CO), including multiple byproducts associated with CH 3 OH oxidation that have previously been identified.…”

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confidence: 99%

Near-Surface Imaging of the Multicomponent Gas Phase above a Silver Catalyst during Partial Oxidation of Methanol

et al. 2020

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Fundamental chemistry in heterogeneous catalysis is increasingly explored using operando techniques in order to address the pressure gap between ultrahigh vacuum studies and practical operating pressures. Because most operando experiments focus on the surface and surface-bound species, there is a knowledge gap of the near-surface gas phase and the fundamental information the properties of this region convey about catalytic mechanisms. We demonstrate in situ visualization and measurement of gas-phase species and temperature distributions in operando catalysis experiments using complementary near-surface optical and mass spectrometry techniques. The partial oxidation of methanol over a silver catalyst demonstrates the value of these diagnostic techniques at 600 Torr (800 mbar) pressure and temperatures from 150 to 410 °C. Planar laser-induced fluorescence provides two-dimensional images of the formaldehyde product distribution that show the development of the boundary layer above the catalyst under different flow conditions. Raman scattering imaging provides measurements of a wide range of major species, such as methanol, oxygen, nitrogen, formaldehyde, and water vapor. Near-surface molecular beam mass spectrometry enables simultaneous detection of all species using a gas sampling probe. Detection of gas-phase free radicals, such as CH3 and CH3O, and of minor products, such as acetaldehyde, dimethyl ether, and methyl formate, provides insights into catalytic mechanisms of the partial oxidation of methanol. The combination of these techniques provides a detailed picture of the coupling between the gas phase and surface in heterogeneous catalysis and enables parametric studies under different operating conditions, which will enhance our ability to constrain microkinetic models of heterogeneous catalysis.

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Morphology and Activity of Electrolytic Silver Catalyst for Partial Oxidation of Methanol to Formaldehyde Under Different Exposures and Oxidation Reactions

Cited by 7 publications

References 33 publications

Electrocatalytic Oxidation of Methanol Over Silver-Based Ag-M/C (M = Cu, Zn, Fe, Cr, Mn) Electrocatalysts Synthesized by Solution Combustion Technique

Electrocatalytic Oxidation of Methanol Over Silver-Based Ag-M/C (M = Cu, Zn, Fe, Cr, Mn) Electrocatalysts Synthesized by Solution Combustion Technique

Interplay of valence states and magnetic interactions in the perovskite system LaNi1Rh O3

Near-Surface Imaging of the Multicomponent Gas Phase above a Silver Catalyst during Partial Oxidation of Methanol

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