Abstract

LOAIZA-GIL, Alfonso  and  LACRUZ, Maria Alejandra. Caracterización de catalizadores de hierro y cobalto soportados sobre sílice sintetizados en  ambiente ácido y básico. Rev. LatinAm. Met. Mat. [online]. 2006, vol.26, n.1-2, pp.20-28. ISSN 0255-6952.

Iron and cobalt catalysts supported on aerosil 200 silica were prepared at pH = 5 and pH = 11 with the purpose of establishing the influence of this parameter on the structural and chemical composition of the catalysts. Characterization tests performed by FT infrared spectroscopy suggest that the cobalt catalysts synthesized at pH = 11 exhibit two hydroxylated phases that react in between them to yield cobalt filosilicate compounds, while those prepared at pH = 5 exhibit only one hydroxylated phase and constitute a supported catalyst. In the iron case the formation of the hydroxylated phases is pH independent. Thermogravimetric analysis (TGA) results on the cobalt catalysts synthesized at pH = 11 suggest the presence of strong metal-support interactions due to a pH effect.

Keywords : Iron and cobalt catalysts; Synthesis; Silica; Influence of pH,; Characterization.