Facile
Preparation of Well-Dispersed CeO<sub>2</sub>–ZnO Composite
Hollow Microspheres with Enhanced Catalytic Activity for CO Oxidation
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Abstract
In
this article, well-dispersed CeO<sub>2</sub>–ZnO composite
hollow microspheres have been fabricated through a simple chemical
reaction followed by annealing treatment. Amorphous zinc–cerium
citrate hollow microspheres were first synthesized by dispersing zinc
citrate hollow microspheres into cerium nitrate solution and then
aging at room temperature for 1 h. By calcining the as-produced zinc–cerium
citrate hollow microspheres at 500 °C for 2 h, CeO<sub>2</sub>–ZnO composite hollow microspheres with homogeneous composition
distribution could be harvested for the first time. The resulting
CeO<sub>2</sub>–ZnO composite hollow microspheres exhibit enhanced
activity for CO oxidation compared with CeO<sub>2</sub> and ZnO, which
is due to well-dispersed small CeO<sub>2</sub> particles on the surface
of ZnO hollow microspheres and strong interaction between CeO<sub>2</sub> and ZnO. Moreover, when Au nanoparticles are deposited on
the surface of the CeO<sub>2</sub>–ZnO composite hollow microspheres,
the full CO conversion temperature of the as-produced 1.0 wt % Au–CeO<sub>2</sub>–ZnO composites reduces from 300 to 60 °C in comparison
with CeO<sub>2</sub>–ZnO composites. The significantly improved
catalytic activity may be ascribed to the strong synergistic interplay
between Au nanoparticles and CeO<sub>2</sub>–ZnO composites