The Synthesis of Three-Dimensional CeO 2 and Their Catalytic Activities for CO Oxidation
- PDF / 986,906 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 18 Downloads / 185 Views
The Synthesis of Three-Dimensional CeO2 and Their Catalytic Activities for CO Oxidation Wenjuan Shan Æ Xiaowei Dong Æ Na Ma Æ Shiyan Yao Æ Zhaochi Feng
Received: 26 May 2009 / Accepted: 9 June 2009 / Published online: 23 June 2009 Ó Springer Science+Business Media, LLC 2009
Abstract This article reports a novel preparation of three-dimensional (3D) CeO2 originating from crystalline cerium formate by a surfactant-free route using H2O, ethanol and ethylene glycol as solvents. The sea urchin shaped 3D CeO2 gave rise to micro/nanocomposite structures with high BET surface area up to 234 m2 g-1. The 3D structure improved the reducibility of surface CeO2 due to the increased oxygen vacancy. Both 3D CeO2 and 5 wt% CuO loaded on 3D CeO2 exhibit high catalytic activities for CO conversion. Keywords CeO2 Three-dimension (3D) Micro/nanocomposite structure and CO oxidation
1 Introduction Ceria and cerium-based compound have become particularly attractive because the great potential for applications in areas including catalysis [1, 2], solid oxide fuel cells (SOFCs) [3], polishing materials [4], gas sensors [5] and so on. Ceria obtained in nanostructure forms are thus expected to be promising as materials that show interesting properties through morphology and nanostructure including the size, shape and surface/volume ratio.
W. Shan (&) X. Dong N. Ma S. Yao Institute of Chemistry for Functionalized Materials, College of Chemistry and Chemical Engineering, Liaoning Normal University, 850 Huang he road, Sha he kou qu, 116029 Dalian, China e-mail: [email protected] Z. Feng State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China
123
In the past few years, many efforts have been made to prepare one-dimensional cerium oxide or compound nanostructures with different morphologies such as nanocube [6], nanotube [7], nanorod [8], nanowires [9], etc. Several reports on the relationship between the catalytic activity and the structure of one-dimensional CeO2 demonstrated by experiments have been published. Yan et al. [10] synthesized ceria with various shapes using a hydrothermal method, and experimentally observed that ceria nanorods showed the highest oxygen storage capacity compared to nanoparticles. Zhou and co-workers [11] converted CeO2 nanorods into nanotubes in an H2O2 solution assisted by ultrasonication, and the nanotubes showed highly reducible property, which was due to the higher activity of CeO2 surface (100) than that of common surface (111). Recently, Shi et al. reported the catalytic activity of two dimensional CeO2 nanoplates [12]. An enhanced catalytic activity for CO oxidation was found for CeO2 nanoplates compared with CeO2 nanotubes and nanorods. Wan [13] synthesized threedimensional (3D) flowerlike ceria micro/nanocomposite structure, which showed much better performance for CO removal than the commercial ceria particles when either used as pure ceria or as a support for Au nanoparticles. It was believed that these structural characte
Data Loading...
