Artigo Publicado em Periódico
Magnetite Formation on Silica and Alumina
Fecha
1994Registro en:
0021-9517
v. 145, n. 2
Autor
Docarmorangel, M.
Galembeck, Fernando
Docarmorangel, M.
Galembeck, Fernando
Institución
Resumen
Iron(III)hydroxoacetate (IHA) was precipitated on (i) silica and (ii) alumina and heated, under conditions at which IHA yields magnetite, according to a new, recently published route for magnetite preparation. In the presence of silica, magnetite formation is prevented. Magnetite obtained by beating IHA deposited on alumina is less crystalline and has a lower Fe(II)/Fe(III) ratio than the unsupported material. Magnetite coatings on alumina are uneven, a feature which is related to the heterogeneity in the morphology of alumina particle surfaces: rougher surfaces are more Intensely coated than smoother ones.