Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (3): 331-336.doi: 10.15541/jim20160288

Special Issue: 环境材料

• Orginal Article • Previous Articles    

Preparation of Ceria-zirconia Mixed Oxides with Improved Thermal Stability for Three-way Catalysts by a Modified Co-precipitation Method

Qing-Feng WU1(), Ya-Juan CUI2, Hai-Long ZHANG3, Yi ZHOU1, Li LAN1, Jian-Li WANG2, Yao-Qiang CHEN1,2()   

  1. 1. College of Chemistry, Sichuan University, Chengdu 610064, China
    2. Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
    3. College of Chemical Engineering, Sichuan University, Chengdu 610064, China
  • Received:2016-05-03 Online:2017-03-20 Published:2017-02-24
  • About author:WU Qing-Feng(1991–), male, candidate of master degree. E-mail: wqfv@outlook.com
  • Supported by:
    Foundation item: National Natural Science Foundation Project of China (21173153);National Hi-tech Research and Development Program of China (863, 2015AA034603)

Abstract:

A series of ceria-zirconia mixed oxides (CZ-x; x=0, 20, 40 and 80) with Ce/Zr molar ratio of 3/2 were synthesized by co-precipitation method. In order to improve the thermal stability of ceria-zirconia mixed oxides, we extended the time for the primary grain to grow up by a modified synthesis reactor. The resulting samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, and transmission electron microscopy (TEM). The results revealed that bigger grain could be obtained by extending time for the primary grain to grow up, which was propitious to enhance the textural properties and structural properties of the materials. Thus, the thermal stability of the materials was improved. In this study, the materials were applied in the field of Pd-only three way catalysts (TWCs). The catalysts exhibited excellent catalytic performance and thermostability, showing better prospect in application.

Key words: ceria-zirconia composites, primary grain, co-precipitation, thermostability

CLC Number: 

  • TQ174