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合成方法对纳米Ce-Zr-Al高温稳定性及储氧性能的影响

陈去非1,2,潘喜强2,赵振波1,杨向光2*   

  1. (1.长春工业大学化学与生命科学学院 长春 130022；
    2.中国科学院长春应用化学研究所绿色化学与过程实验室 长春 130022)
  • 收稿日期:2012-01-04 修回日期:2012-02-13 出版日期:2012-11-10 发布日期:2012-11-10
  • 通讯作者: 杨向光，研究员; Tel/Fax:0431-85262687; E-mail:xgyang@ciac.jl.cn; 研究方向：环境催化
  • 基金资助:
    国家高技术研究发展计划 (863计划,2011AA03A406)

Effect of synthesis method on thermal stability and oxygen storage capacity of the Ce-Zr-Al nanocomposite

CHEN Qufei1,2, PAN Xiqiang2, ZHAO Zhenbo1, YANG Xiangguang2*   

  1. (1.School of Chemistry and Life Science,Changchun University of Technology,Changchun 130022,China;
    2.Laboratory of Green Chemistry and Process,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)
  • Received:2012-01-04 Revised:2012-02-13 Published:2012-11-10 Online:2012-11-10

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被引次数

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摘要： 采用柠檬酸溶胶凝胶、溶胶辅助共沉淀和溶胶共沉淀3种方法合成了不同Al掺杂的纳米CexZr1-xO2与Al2O3的复合体Ce-Zr-Al。 用XRD、BET和H2-TPR表征了纳米Ce-Zr-Al复合体的抗烧结性与储氧性能，与未掺杂的铈锆固溶体相比，Al掺杂的纳米铈锆复合体的抗烧结性与储氧性能均有显著改善，柠檬酸溶胶凝胶法的最佳掺杂量为5倍Al(Al与CexZr1-xO2摩尔比)，溶胶辅助共沉淀法最佳掺杂量为10倍Al，溶胶共沉淀法最佳掺杂量为5倍Al，其中，柠檬酸溶胶凝胶法合成的Ce-Zr-Al纳米复合物储氧量最高，为717.5 μmol/g-CeO2，占理论储氧量(即储氧效率)的49.3%。

关键词: 铈锆固溶体, 纳米复合体, 热稳定性, 溶胶凝胶法, 储氧量

Abstract: CeO2-ZrO2 solid solution is an indispensable oxygen storage material for the three way catalyst to control the pollution gas emission from automobiles. In this paper, three series of Ce-Zr-Al nanocomposite(ACZ) was prepared by citrate acid sol-gel method, sol assistant co-precipitation and sol co-precipitation, respectively. The obtained samples were calcinated at 1000 ℃ for 4 h to test the thermal stability and oxygen storage capacity(OSC). The effect of synthetic methods on these properties was investigated by means of X-ray diffraction(XRD), Brunauer Emmett Teller(BET) specific surface area(SSA) and H2 temperature-programmed reduction(H2-TPR). The results revealed that the thermal stability and oxygen storage capacity of all the ACZ were improved compared to the pure CeO2-ZrO2 solid solution. The molar proportion of Al doped in ACZ is 5, 10, 5 for citrate acid sol-gel method, sol assistant co-precipitation and sol co-precipitation, respectively. ACZ prepared by citrate acid sol-gel method had the highest oxygen storage capacity(717.5 μmol/g-CeO2), account for 49.3% of the theoretical maximum.

Key words: Ce-Zr solid solution, nanocomposite, thermal stability, sol-gel method, oxygen storage capacity

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