Perovskitas preparadas pelo método do citrato como catalisadores para a reação de redução de NO com CO / Perovskites prepared by citrate method like catalysts to NO with CO reduction reaction

AUTOR(ES)

Janaina de Souza Garcia

DATA DE PUBLICAÇÃO

2003

RESUMO

One of the biggest problems that man has found because of his development is the pollution. The main responsible for atmospheric pollution are the automotive vehicles and to minimize the pollution produced by them it has been necessary to use catalysts. These catalysts, called "three way catalysts", actually have noble metals like active sites, what takes up very much their cost and let drivers dispense this equipment. The objective oh this study was to prepare, characterize and study materials of perovskites kind (La2CuO4, La(2-x)CexCuO4, La2Mo2O9, LaCoO3, LaNiO3, La2CuO4/LaNiO3) like catalysts to the reaction of reduction of NO with CO, with the end of find a alternative to substitute the noble metal in the commercial catalytic conversers. The catalysts were prepared by citrate method, calcined at 800 or 900oC, characterized by X-ray diffraction, temperature programmed reduction, specific area and chemical analysis, being observed the formation of perovskite in all characterizations. During the catalytic research to the reaction of NO with CO, the catalysts calcined at 800oC were more active compared to those calcined at 900o and, in relation to the component metal of the perovskite, how more filled the valence band of the metal in the structure of perovskite, better its activity.

ASSUNTO(S)

no with co reduction catalisador perovskites redução de no com co perovskitas catalyst

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