物理化学学报 >> 2013, Vol. 29 >> Issue (05): 1097-1106.doi: 10.3866/PKU.WHXB201302262

材料物理化学 上一篇    下一篇

陈化体系组成对Ce0.65Zr0.35O2储氧材料性能的影响

黄利华1,2, 陈山虎3, 张秋林3, 龚茂初3, 陈耀强1,3   

  1. 1 四川大学建筑与环境学院, 成都 610064;
    2 西南科技大学环境与资源学院, 四川 绵阳 621010;
    3 四川大学化学学院, 成都 610064
  • 收稿日期:2012-11-27 修回日期:2013-02-26 发布日期:2013-04-24
  • 通讯作者: 陈耀强 E-mail:nic7501@scu.edu.cn
  • 基金资助:

    国家自然科学基金(21173153)和四川省科技厅科技支撑项目(2011GZ0035)资助

Influence of Composition of Ageing System on Performance of Ce0.65Zr0.35O2 Oxygen Storage Materials

HANG Li-Hua1,2, CHEN Shan-Hu3, ZHANG Qiu-Li3, GONG Mao-Chu3, CHEN Yao-Qiang1,3   

  1. 1 Institute of construction and environment of Sichuan University, Chengdu 610064, P.R.China;
    2 Institute of environment and resource of Southwest University of Science and Technology, Mianyang 621010, Sichuan, P. R. China;
    3 College of Chemistry of Sichuan University, Chengdu 610064, P. R. China
  • Received:2012-11-27 Revised:2013-02-26 Published:2013-04-24
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21173153) and Foundation of Science and Technology of Sichuan Province, China (2011GZ0035).

摘要:

采用共沉淀法制备了Ce0.65Zr0.35O2(CZ)储氧材料, 在传统的水陈化体系中引入了乙醇, 研究了乙醇的加入对CZ储氧材料性能的影响. 对所制备样品进行了傅里叶变换红外(FTIR)光谱、X射线光电子能谱(XPS)、粉末X射线衍射(XRD)、扫描电镜(SEM)、N2吸附-脱附、储氧量(OSC)和H2程序升温还原(H2-TPR)的表征, 并考察了以CZ储氧材料为载体制备的单钯催化剂的三效性能. 结果表明, 乙醇引入陈化体系对样品的结构和性能有显著影响. 以醇水共存体系陈化制备的CZ储氧材料颗粒小、堆积松散、孔径分布宽、孔容大, 具有优异的储氧性能和热稳定性, 经1000 °C焙烧后, 比表面积为29.3 m2·g-1, 储氧量仍高达520 μmol·g-1. 以此为载体制备的单钯催化剂, 空燃比操作窗口宽, 对C3H8、CO、NO的转化明显优于水陈化体系制备的储氧材料所制备的催化剂.

关键词: 醇水体系, Ce0.65Zr0.35O2储氧材料, 结构, 性能

Abstract:

Ce0.65Zr0.35O2(CZ)mixed oxides were prepared by coprecipitation. The influence of ethanol on the performance of CZ and Pd based three-way catalysts was investigated. Samples were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen sorption, oxygen storage capacity (OSC), and hydrogen temperature-programmed reduction (H2-TPR) techniques. The precipitation aging method had an appreciable impact on oxide structure and catalyst performance. Samples aged in ethanol-water system exhibited wide pore-size distributions, large pore volumes and high redox properties, OSC and thermal stabilities. After calcination at 1000 ° C, the specific surface area and OSC of the samples were 29.3 m2·g-1 and 520 μmol·g-1, respectively. The excellent structural and textural properties resulted in a high catalytic activity, wide air-to-fuel operating range, and low light-off and full-conversion temperatures to C3H8, CO, and NO of the corresponding three-way catalyst.

Key words: Ethanol-water system, Ce0.65Zr0.35O2 oxygen storage material, Structure, Performance

MSC2000: 

  • O643