La0.5Ce0.5O1.75-catalytic layer for methane conversion into C2 products using solid oxide fuel cell
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Methane (CH4), the major constituent of natural gas and biogas, is an abundant source to obtain value-added hydrocarbons. The oxidative coupling of methane (OCM) is a direct catalytic route to convert CH4 towards C2 hydrocarbons, ethane (C2H6) and ethylene (C2H4). Using a solid oxide fuel cell (SOFC) is a strategy to overcome some challenges of fixed-bed catalytic reactors. In this context, we have studied the La0.5Ce0.5O1.75 (LCO) oxide as a catalytic layer in a SOFC for methane conversion to ethylene. Single phase LCO was synthesized by the combustion method. X-ray diffraction (XRD) showed that LCO solid solution has a disordered fluorite crystalline structure. Raman spectroscopy data evidenced the presence of surface oxygen vacancies, which may benefit the OCM reaction. SEM images evidenced a microstructure composed of porous agglomerated particles with an irregular shape, expected from the combustion synthesis. Impedance spectroscopy (IS) measurements of sintered LCO pellets were performed in a wide range of both temperature and oxygen partial pressure (pO2). Thermally activated behavior of the total electrical conductivity revealed that LCO is predominantly an ionic conductor at 10-6 < pO2 < 0.21 atm, whereas at pO2 ~ 10-21 atm, n-type electronic conductivity leads to a mixed ionic electronic conductor behavior, due to the Ce4+/3+ reduction. The catalytic properties of LCO and the optimized OCM reaction conditions were investigated a fixed-bed reactor. The desired products were obtained (C2H6 and C2H4), as well the parallel products (COx, and traces of C3H8 and C4H10). The higher rates of CH4 conversion (22 %), C2 selectivity (54 %) and yield (12 %) were reached for the reaction developed with 4CH4:1O2 at 750 ºC. Electrolyte-supported single cells were prepared using a YSZ disk (diameter ~ 19 mm, thickness ~ 0.4 mm) as the electrolyte. The cathode (LSM) and anode (NiO/YSZ) layers were both deposited by screen-printing on each side of the YSZ disk. For the catalytic layer, LCO was deposited, using the spray-coating technique, on the anodic side. The electrochemical properties of such fuel cell tests were characterized under 10 % H2 between 750 – 800 ºC, and then, the fuel was switched to 10 % CH4, both using Helium as a carrier gas. The anode outlet gas was monitored by an online gas analyzer setup that showed formation of C2H4, C2H6 and COx, indicating the effectiveness of the catalytic layer.
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VILELA, VANESSA B.; THYSSEN, VIVIAN V.; FAYARD, FRANCK F.; MASSIM, LAURANCE; FLORIO, DANIEL Z. de; FERLAUTO, ANDRE S.; STEIL, MARLU C.; FONSECA, FABIO C. La0.5Ce0.5O1.75-catalytic layer for methane conversion into C2 products using solid oxide fuel cell. ECS Meeting Abstracts, v. MA2023-01, n. 54, 2023. DOI: 10.1149/MA2023-0154307mtgabs. Disponível em: https://repositorio.ipen.br/handle/123456789/48720. Acesso em: 20 Jan 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.