Journal of physical chemistry c vol:111 issue:30 pages:11150-11156
The structure formation of cogelled Pd/SiO2 catalysts is followed in situ at the nanometer scale using time-resolved small-angle X-ray scattering (SAXS). The SAXS patterns are analyzed in terms of a reaction-induced spinodal decomposition that is responsible for the formation of the silica support and most likely for the metal dispersion as well. The results are discussed in the light of recent electron tomography characterizations of the catalysts. The latter technique reveals regularity in the metal dispersion, the origin of which is likely to be the very occurrence of a spinodal phase separation.