Abstract
We present a simple, solution-based synthetic route to hollow cerium oxide spheres. Thin layers (∼12 nm) of cerium oxide are deposited onto ∼200 nm silica colloids using cerium nitrate and the silica cores are subsequently removed to yield hollow spheres. The spheres are composed of ∼4 nm ceria nanocrystals. Nitrogen adsorption isotherms indicate that the spheres are microporous with pore sizes of approximately 10 Å. The spheres are thermally stable to collapse and ripening up to 700 °C and are active for the catalytic combustion of carbons. The hollow ceria spheres developed in this work are attractive as building blocks for multicomponent catalysts.
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