"Óxidos do tipo Perovskitas para reações de decomposição direta de NO e redução de NO com CO" / "Reduction of NO by CO and direct decomposition of NO on perovskite-type oxide"

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

A important technology to reduce the atmospheric pollution is the use of catalysts, to transform high pollutant as NO in other inoffensive gases to the environment. In this work, the perovskite oxides La2CuO4, LaNiO3, LaMnO3, La1,4Sr0,6CuO4, La0,7Sr0,3NiO3 e La0,7Sr0,3MnO3 were prepared through co-precipitation method and characterized by X-ray diffraction and temperature programmed reduction, nitrogen physsisorption and subsequent valued on the reduction of NO by CO and the direct decomposition of NO. These reaction were tested at 400oC and 500oC temperatures and times of reaction between 7 and 10 hours. Through the catalytic tests the La2CuO4 catalyst shown the best activity to the reduce reaction, and when the La is partially substituted by strontium all the catalyst showed a better significant for all the catalysts. The XRD analysis shown that the catalytic structure of the catalysts were preserved after the catalytic test yet.

ASSUNTO(S)

no perovskite perovskita decomposição no decomposition

ACESSO AO ARTIGO

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