In situ source-template-interface reaction route to hollow ZrO2 microspheres with mesoporous shells

Hollow ZrO2 microspheres with mesoporous shells have been synthesized by a novel hydrothermal reaction of zirconium oxychloride in the presence of urea, hydrochloric acid, and ethanol. The morphology and shell thickness of the hollow microspheres can be controlled by varying synthesis conditions. After calcination at high temperature, the morphologies of the hollow microspheres are essentially preserved. Pt catalyst supported on the hollow calcined ZrO2 microspheres exhibits more excellent catalytic performance in CO oxidation than those on ZrO2 powders derived from conventional precipitation methods. (c) 2008 Elsevier Inc. All rights reserved.