PREPARACIóN DE CATALIZADORES DE HIERRO Y COBALTO SOPORTADOS EN AEROGELES DE CARBONO

iron and cobalt catalysts supported on carbon aerogels (ca) were prepared by incipient wetness, cationic interchange and the addition of a metal salt to the precursory mixture of the aerogels. the catalysts were characterized by adsorption of n2 at 77 k, temperature programmed descomposition analysis (tpd), and x-ray diffraction (xrd). the results show that the catalysts prepared by incipient wetness and cationic interchange have a microporous texture, whereas the prepared by addition of a metal salt to the initial mixture are mesoporous. tpd results show that the surface chemistry of the aerogels is influenced by the preparation method and the chemical nature of the metal. xrd analyses reveal that the reducing character of the aerogels carbonaceous matrix is able to carburize and/or to reduce the built-in metal.