Evaluation of bifunctional CeO2/ZrO2 catalysts in methane electrooxidation
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2022
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BRAZIL MRS MEETING, 20th
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Resumo
Methane (CH4) is the main component of natural gas (70 to 90%), the fossil fuel, whose
consumption has grown the most in the world. The International Energy Outlook 2019
projects that global consumption of natural gas will increase by 40% from 2018 to 2050,
reaching 200 quadrillion btu [1]. Electro-oxidation of this compound can occur at low
temperatures via direct method and the increase in the conversion rate to methanol can be
achieved with the development of new efficient catalysts. In this work, the synthesis of
CeO2/ZrO2-based bifunctional electrocatalysts was evaluated using the hydrothermal process
assisted by microwave, varying the proportions in the ratios of 1:2, 2:1 and 1:6 Ce/Zr,
respectively. Such mixtures are used as starting precursors to form mixed metal oxides and
solid solutions followed of heat treatment at 200ºC for 30 minutes for phase formation,
called mixed oxides (CexZryO2) and solid solutions (CeO2/ZrO2). The electro-oxidation of
methane under potentials of 1.1V and 1.6V vs. Ag/AgCl led to the majority formation of
methanol, ethanol, and acetone as the main products of this conversion in sodium carbonate
medium as an electrolyte. However, these conversions are more pronounced from the
variation of Ce/Zr ratios to produce both alcohols with 2.4% and 4.2% efficiency for
CeO2/ZrO2(1:1), respectively, while CeO2/ZrO2(1:2) generates only methanol with a higher
efficiency of 6.9%. Thus, under optimized conditions, it was possible to observe that ceria
and zirconia oxides can efficiently promote the conversion of methane to other commercially
valuable products using suitable oxidation potentials and, therefore, be a promising
alternative for this reaction.
Como referenciar
PATRICIO, NICOLE B.; CARDOSO, JULIANO C.; LANFREDI, ALEXANDRE J. de C.; ESCOTE, MARCIA T.; SANTIAGO, ELISABETE I. Evaluation of bifunctional CeO2/ZrO2 catalysts in methane electrooxidation. In: BRAZIL MRS MEETING, 20th, September 25-29, 2022, Foz do Iguaçu, PR. Abstract... São Carlos, SP: Aptor Software, 2022. Disponível em: http://repositorio.ipen.br/handle/123456789/33562. Acesso em: 31 Dec 2025.
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.