A method for the preparation of an amorphous metal oxide composite, and amorphous metal oxide composites, including catalysts, prepared thereby

摘要

@ A method for the preparation of a metal oxide composite, e.g. silica-alumina, having high uniformity and porosity in structure, comprises forming a homogeneous solution of at least two kinds of oxygen-containing organic metal compounds, e.g. metal alkoxides, in a solvent mixture containing a polar compound having multifunctionality or coordinatively crosslinking power, e.g. hexyleneglycol, together with admixture of water to cause cohydrolysis of the oxygen-containing organic metal compounds so that the homogeneous solution is converted into a sol and then into a gelled coagulum followed by drying and heating the coagulum to evaporate the polar compound. The method is applicable to the preparation of a solid catalyst containing a highly dispersed, catalytically active metal as one of the integral components in the metal oxide composite by the admixture of a readily reducible salt of the catalytically active metal to the solution before hydrolysis and heating the gelled coagulum impregnated with the metal salt in a reducing atmosphere to reduce the salt into the metalic form.