INTEQUI 20941
INSTITUTO DE INVESTIGACIONES EN TECNOLOGIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Effect of B-site cation on the catalytic activity of La1-xCaxBO3 (B= Fe, Ni) perovskite-type oxides for toluene combustion
Autor/es:
PECCHI, G.; JILIBERTO M. GRACIELA; DELGADO E. J.; CADUS, LUIS E.; FIERRO JOSE L. G.
Revista:
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Editorial:
JOHN WILEY & SONS LTD
Referencias:
Lugar: LOndres; Año: 2011 vol. 88 p. 1067 - 1073
ISSN:
0268-2575
Resumen:
BACKGROUND: The effect of the B cation on the surface properties and catalytic activity in the total combustion of toluene over
La1−xCaxBO3 (B = Fe,Ni) perovskite-type oxides was studied.
RESULT: For the La1−xCaxFeO3 series, the perovskite structurewas maintained in the range of substitution studied.Acompletely
different behaviour was observed for the La1−xCaxNiO3 series. A Brownmillerite-type structure (La2Ni2O5) with a large degree
of phase segregation as well dispersed mixed oxides was observed upon the substitution of La for Ca. In the Fe series, the
catalytic activity in the total combustion of toluene showed that the insertion of calcium ions into the perovskite lattice resulted
in higher activity relative to the unsubstituted LaFeO3 perovskite. In contrast, for the Ni series, substitution results in solids
with lower activity than the pure LaNiO3 perovskite.
CONCLUSION: For the Fe series, higher activity and stability are attributed to a synergy between Fe4+/Fe3+ and the oxygen
vacancies generated by the calcium substitution. For the Ni counterpart, the structural modification leads to a lower activity of
substituted solids comparedwith the pure LaNiO3 perovskite, indicating thatNi3+ ions are the active sites for toluene oxidation.
c 2011 Society of Chemical Industry
