Preparation of ceria-coated composite silica particles

Abstract

A method for preparing particles with highly dispersed ceria by a stepwise procedure is described. The surface of silica particles was modified by aluminate and coated with an interlayer of titanina. CeOSO₄ was deposited on the titania coated silica particles. The sulfur in the dispersed ceria was removed by calcining the particles in air at 800°C for 30 min. A highly dispersed ceria was obtained when using titania-coated silica particles with diameters of 80, 240 and 500 nm. The prepared products were characterised by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), UV spectroscopy and electrophoresis.