Ethylene epoxidation on Ag/YSZ electrochemical catalysts: Understanding of oxygen electrode reactions

Cavoué, Thomas; Caravaca, A.; Kalaitzidou, I.; Rieu, Mathilde; Viricelle, Jean‐Paul; Vernoux, P.

doi:10.1016/j.elecom.2019.106495

Cited by 8 publications

(23 citation statements)

References 27 publications

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“…The main issue nowadays remains the energyefficient/environmentally friendly production of H2. Many efforts were performed in the last years to upgrade biomass-based by-products and wastes via electrolysis [2][3][4][5][6][7][8]. In these electrolyzers, H2 is produced at the cathode by the electro-reduction of water (2 H2O + 2 eà H2 + 2 OH -), while the organic molecule is electro-oxidized at the anode (CxHyOz + OHà Cx'Hy'Oz' + CO + CO2 + e -), allowing for the co-production and separation of pure hydrogen and a wide variety of organic products.…”

Section: Introductionmentioning

confidence: 99%

“…Many efforts were performed in the last years to upgrade biomass-based by-products and wastes via electrolysis. [2][3][4][5][6][7][8] In these electrolyzers, H 2 is produced at the cathode by the electro-reduction of water (2 H 2 O + 2 e − → H 2 + 2 OH − ), while the organic molecule is electro-oxidized at the anode (C x H y O z + OH − → C x' H y' O z' + CO + CO 2 + e − ), allowing for the coproduction and separation of pure hydrogen and a wide variety of organic products. In addition, the production of hydrogen by these processes is potentially less energy-intensive than that for the stateof-the-art water electrolysis, since the electro-oxidation of the organic molecule (identified as the rate limiting step of the electrolysis process 9 ) is thermodynamically favored compared to the oxygen evolution reaction (4 OH − → O 2 + 2 H 2 O + 4 e − , thermodynamically allowed from V cell = 1.23 V 10 ).…”

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confidence: 99%

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Towards Understanding Lignin Electrolysis: Electro-Oxidation of a β-O-4 Linkage Model on PtRu Electrodes

Beliaeva

Elsheref

Walden

et al. 2020

J. Electrochem. Soc.

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The reaction mechanism for lignin electrolysis has been rarely studied. In a previous work, we reported the electrolysis of lignin on a Polymer Electrolyte Membrane (PEM) alkaline electrolyzer with PtRu-based anodes. Even though the performance of this technology was proven in a low range of applied potentials (< 1.2 V) and reaction temperatures (< 90 o C), the activity of the system was strongly hindered, leading to low H2 production rates. The aim of this work is to study the main limitations of PtRu electrodes for lignin electro-oxidation. 2-Phenoxyethanol, 2-PE, has been chosen as a model molecule of the b-O-4 linkage, which represents ≈ 60 % of the lignin bio-polymer. The performed electrochemical experiments, together with the HPLC analysis of the anodic products and the thermodynamic DFT computations, suggest that the electro-oxidation of the 2-PE organic molecule is very limited and leads to the production of the carboxylic acid as the final reaction product. In addition, the electro-catalytic system was severely poisoned, probably owing to the presence of some reaction by-products. All in all, this study allows advancing one step-forward towards understanding the reaction mechanism and the main limitations of the lignin electrolysis technology in the above described system.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Towards Understanding Lignin Electrolysis: Electro-Oxidation of a β-O-4 Linkage Model on PtRu Electrodes

Beliaeva

Elsheref

Walden

et al. 2020

J. Electrochem. Soc.

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“…This can be attributed to the kinetics of the competitive oxygen electrode reaction (5) on Ag 0 which are known to increase with the temperature and the oxygen partial pressure [31]. In addition, the rate of the subsequent oxidation of EO into CO2 also increases with the temperature, lowering the positive impact of the current on the EO selectivity.…”

Section: Electrocatalytic Activity Of Ag/gdc Cermet Coatingsmentioning

confidence: 99%

Ag-based electrocatalysts for ethylene epoxidation

Gilbert

Cavoué

Aouine

et al. 2021

Electrochimica Acta

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“…In 2021, 30.7 million metric tons of EO was produced worldwide making it one of the largest chemicals produced by volume (2). It is industrially produced at temperatures around 300°C and high pressure (3,4). EO is produced by breaking the carbon-carbon double bond of ethylene and adding an oxygen atom using silver catalysts commonly supported on 𝛼-Al2O3 (5,6).…”

Section: Introductionmentioning

confidence: 99%

Short Term Silver Electrode Microstructure Changes Under Epoxidation Conditions for Solid Oxide Electrolysis Cells

Jenkins¹,

Tian²,

Milcarek³

2023

ECS Trans.

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Ethylene epoxidation is an important reaction to form ethylene oxide (EO), which is a precursor to many other critical chemicals. This study links short-term EO production to the effects on the microstructure of Ag/yttria-stabilized zirconia cells with and without an electrochemically promoted catalyst (EPOC). Nano scale features called striations were observed using a Scanning Electron Microscope (SEM) on the silver under all reaction conditions tested. While appearing in both cases, the striations for the EPOC case are finer in size (~150 to 250 nm) compared to the no current case (~400 to 500 nm). These features did not appear when epoxidation conditions were not present. Striation formation was further linked to the epoxidation reaction through electrochemical impedance spectroscopy (EIS) and gas chromatography (GC). Ethylene conversion to EO declines over the course of hours as striations form, indicating that striations have a negative influence on the reaction. Striation formation further effected the electrochemical performance of the cells, resulting in the low frequency depressions observed in EIS to shrink in both cases after 10 hours of epoxidation.

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Ethylene epoxidation on Ag/YSZ electrochemical catalysts: Understanding of oxygen electrode reactions

Cited by 8 publications

References 27 publications

Towards Understanding Lignin Electrolysis: Electro-Oxidation of a β-O-4 Linkage Model on PtRu Electrodes

Towards Understanding Lignin Electrolysis: Electro-Oxidation of a β-O-4 Linkage Model on PtRu Electrodes

Ag-based electrocatalysts for ethylene epoxidation

Short Term Silver Electrode Microstructure Changes Under Epoxidation Conditions for Solid Oxide Electrolysis Cells

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