EDITOR
Dr. Bernabé Rivas Q.

EDITOR ASISTENTE
Dr. Carlos Peña F.

EDITORES ASOCIADOS
Dr. Victor Kesternich M. Dr. Hugo Klahn O. Dr. Juan Squella S. Dr. Alejandro Toro
Dra. Verónica Arancibia M. Dr. Ramiro Araya M. Dr. José Becerra A. Dra. Soledad Bollo D. Dr. Manuel Bravo M. Dr. Marcelo Campos V. Dr. Nestor Escalona B. Dr. José García F. Dr. Rafael García L. Dra. María Soledad Gutiérrez O. Dra. Cecilia Labbé D. Dr. Eduardo Lissi G. Dr. Victor Manríquez C. Dr. Hector Mansilla G. Dr. Eduardo Manta A. Dra. Betty Matsuhiro Y. Dr. Sergio Moya D. Dra. Patricia Pérez L. Dr. Hernán Ríos P. Dr. Leonardo S. Santos Dra. M. Soledad Ureta Z. Dr. Nicolas Yutronic S.
Volumen 51, Nº 4, Diciembre de 2006 PDF Imprimir E-mail

journalCATALYTIC COMBUSTION OF METHANE OVER LaFeO3 PEROVSKITES: THE INFLUENCE OF COPRECIPITATION pH AND AGEING TIME

GINA PECCHIA*, PATRICIO REYESA, RAÚL ZAMORAA, LUIS E. CADÚSB, BIBIANA P. BARBEROB

a:Departamento de Físico-Química, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile.
bInstituto de Investigaciones en Tecnología Química (INTEQUI), UNSL-CONICET, Universidad Nacional de San Luis, San Luis, Argentina.

The aim of this work was to study the effect of two precipitation pHs and three different ageing times on the preparation of simple LaFeO3 perovskites for their use as catalysts in the methane combustion. Absorption atomic spectroscopy (AAS), BET specific area measurements, XRD analysis, Raman, XPS, TGA and DTA analysis, TPR and TPO profiles revealed that significant changes in chemical composition, surface area and surface composition was produced at pH 8 when the ageing time was changed, leading to solids with different catalytic activity in methane combustion. At the higher precipitation pH studied, pH 10, the physical chemistry properties for all the samples obtained at different ageing times are almost identical, and therefore the solids exhibit similar activities in the combustion reaction. The catalysts were found to be active for methane combustion, and the effect of the perovskite’s structure and surface properties became more important.

 

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