v. 30 n. 1 (2017): Revista ION
Artigo de investigação científica e/ou tecnológica

Redutibilidade e comportamento catalítico da fase Ruddlesden-Popper La 0,25 Sr 1,75 MnO4 preparada pelo método de Pechini modificado

Reinaldo Calderón Supelano
Centro de Investigaciones en Sólidos (UNIDEF-MINIDEF-CONICET),
Susana Adelina Larrondo
Instituto de Investigación e Ingeniería Ambiental, Universidad de San Martín
Gilles Henri Gauthier
Universidad Industrial de Santander

Publicado 2017-06-30

Palavras-chave

  • SOFC,
  • anodo,
  • manganita,
  • XRD,
  • TPR,
  • oxidação Catalítica
  • ...Mais
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Como Citar

Supelano, R. C., Larrondo, S. A., & Gauthier, G. H. (2017). Redutibilidade e comportamento catalítico da fase Ruddlesden-Popper La 0,25 Sr 1,75 MnO4 preparada pelo método de Pechini modificado. REVISTA ION, 30(1). https://doi.org/10.18273/revion.v30n1-2017003

Resumo

Poucos estudos têm sido reportados sobre o uso de compostos de manganésio (La,Sr)2MnOde estrutura tipo Ruddlesden-Popper, como eletrólitos de Células de Combustível de Oxido Solido (SOFC), em particular como ânodos. No presente trabalho o composto La0,25Sr1,75MnO4 foi sintetizado pelo método de Pechini modificado. O material foi estudado pela técnica de Difração de Raios-X (XRD), Microscopia Eletrônica de Varredura (SEM) e sua estrutura analisada em detalhe mediante refinamento. La0,25Sr1,75MnO4 foi sometido a um estudo de Redução a Temperatura Programada (TPR) e foram avaliadas as propriedades catalítica para a oxidação total e/ou parcial de metano. Os parâmetros de rede estimados no refinamento são muito parecidos com os reportados na literatura para series com composições próximas. A redução do material em H2 diluído ocorre em múltiplos estágios e a decomposição começa por cima de 800°C. Nos estudos catalíticos o material atua como catalisador para a oxidação total de metano mesmo em atmosferas deficientes de oxigeno.  

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