THE PREPARATION OF HIGH-SURFACE-AREA CEO2-ZRO2 MIXED OXIDES BY A SURFACTANT-ASSISTED APPROACH

The study investigates the preparation of high surface area, three-way catalysts (TWC)-like, ceria-zirconia mixed oxide. It is shown that un der basic conditions cationic surfactants effectively incorporate into hydrous oxides of cerium and zirconium. The presence of cerium inhibi ts the action of alkyl-trimethyl-ammonium salts as true templating age nts and there is no formation of a regular pore structure, The elimina tion of surfactants upon calcination gives rise to the formation of hi gh surface area, fluorite-structured CeO2-ZrO2 solid solution characte rized by a fairly good compositional homogeneity, Surface areas in exc ess of 230 m(2)/g were obtained after calcination at 723 K, which drop to ca. 40 m(2)/g following treatment at 1173 K. (C) 1998 Elsevier Sci ence B.V. All rights reserved.