INVESTIGADORES
BOCANEGRA Sonia Alejandra
artículos
Título:
Innovative Coating Method of MgAl2O4 or ZnAl2O4 on α-Al2O3 Spheric Nuclei
Autor/es:
LIC. GRACIELA MABEL BAEZ; ING. OSVALDO SCELZA; DR. SERGIO DE MIGUEL; DRA. SONIA BOCANEGRA
Revista:
MATERIALS RESEARCH
Editorial:
UNIV FED SAO CARLOS
Referencias:
Lugar: São Paulo; Año: 2015 vol. 18 p. 404 - 410
ISSN:
1516-1439
Resumen:
Structured materials composed of α-Al2O3 spheres covered with a porous and thin layer of MgAl2O4 or ZnAl2O4 were obtained. The innovative coating method developed consists in the formation of a precursor gel of MgAl2O4 or ZnAl2O4 by citrate-nitrate combustion method. The alumina spheres are submerged in this gel and then submitted to a drying process in vacuum and to calcinations with N2 and N2/O2. SEM results showed that a very rough and porous layer uniformly covers the spheres. The thickness of the layer reaches the maximum value of 16 μm in the sample coated with two layers of ZnAl2O4. XRD results confirmed the MgAl2O4 or ZnAl2O4 spinel formation in the layered material. The structured materials were used as Pt catalysts supports, showing a good catalytic activity in the n-butane dehydrogenation reaction.
