title: Facile preparation of well-dispersed CeO2-ZnO composite hollow microspheres with enhanced catalytic activity for CO oxidation.
abstract: In this article, well-dispersed CeO2-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, CeO2-ZnO composite hollow microspheres with homogeneous composition distribution could be harvested for the first time. The resulting CeO2-ZnO composite hollow microspheres exhibit enhanced activity for CO oxidation compared with CeO2 and ZnO, which is due to well-dispersed small CeO2 particles on the surface of ZnO hollow microspheres and strong interaction between CeO2 and ZnO. Moreover, when Au nanoparticles are deposited on the surface of the CeO2-ZnO composite hollow microspheres, the full CO conversion temperature of the as-produced 1.0 wt % Au-CeO2-ZnO composites reduces from 300 to 60 °C in comparison with CeO2-ZnO composites. The significantly improved catalytic activity may be ascribed to the strong synergistic interplay between Au nanoparticles and CeO2-ZnO composites.
authors.affiliation: Department of Materials Science and Engineering, College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University , Xiamen 361005, China.
authors.forename: Qingshui
authors.initials: Q
authors.lastname: Xie
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhao
authors.forename: Huizhang
authors.initials: H
authors.lastname: Guo
authors.forename: Aolin
authors.initials: A
authors.lastname: Lu
authors.forename: Xiangxin
authors.initials: X
authors.lastname: Zhang
authors.forename: Laisen
authors.initials: L
authors.lastname: Wang
authors.forename: Ming-Shu
authors.initials: MS
authors.lastname: Chen
authors.forename: Dong-Liang
authors.initials: DL
authors.lastname: Peng