Abstract
Abstract In this study, several three-dimensionally ordered macroporous (3DOM) CeO 2 having hierarchical pore structure were successfully prepared via a dual ‘hard-soft’ templating strategy using Ce(NO 3 ) 3 ·6H 2 O containing phenol-formaldehyde (PF) resol or/and sucrose as the ceria precursor. The resulting CeO 2 samples were characterized by N 2 adsorption-desorption analysis, scanning electron microscopy, transmission electron microscopy and X-ray diffraction, which showed that the hierarchical 3DOM CeO 2 possessed interconnected networks of the ordered macropore structures with large mesopores, and both the BET surface area and pore volume increased significantly compared with the conventional 3DOM CeO 2 . The improved textural parameters should be attributed to the emergence of mesopores in the interconnected three-dimensional skeleton, which were formed by oxidative removal of carbon produced from carbonization of PF resol or sucrose. The hierarchical 3DOM CeO 2 exhibited a superior performance to the conventional 3DOM or bulk CeO 2 when used as supports for Ir catalysts in preferential CO oxidation.
Published Version
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