物理化学学报 >> 2001, Vol. 17 >> Issue (03): 248-251.doi: 10.3866/PKU.WHXB20010313

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LaMnO3稀土纳米材料及催化性能

翁端;丁红梅;吴晓东;徐鲁华;陈震   

  1. 清华大学材料科学与工程系,北京 100084
  • 收稿日期:2000-07-13 修回日期:2000-11-03 发布日期:2001-03-15
  • 通讯作者: 翁端 E-mail:duanweng@tsinghua.edu.cn

Catalytic Performance of Rare Earth Nanometer Materials LaMnO3+ë

Weng Duan;Ding Hong-Mei;Wu Xiao-Dong;Xu Lu-Hua;Chen Zhen   

  1. Department of Material Science & Engineering, Tsinghua University,Beijing 100084
  • Received:2000-07-13 Revised:2000-11-03 Published:2001-03-15
  • Contact: Weng Duan E-mail:duanweng@tsinghua.edu.cn

关键词: 稀土, 纳米钙钛矿, 共沉淀, 催化性能

Abstract: As catalytic materials, nanometer rare earth perovskites LaMnO3 were p repared by NaOHNa2CO3 coprecipitation, followed by supercritical drying, vacuu m drying and air drying respectively. The effect of drying processes was studied on the catalyst performance through XRD, TEM, SEM and BET analysis. The results demonstrated that about 30 nm LaMnO3 particles could be prepared by three dryin g processes respectively. The catalyst materials LaMnO3 dried in vacuum presente d the largest specific surface area as 28.71 m2•g-1. Compared to the catalyst prepared by dipping cordierite directly in the salt solutions, nanometer LaMnO3 showed better catalytic activity. The lightoff temperatures for CO and HC oxid ation were both lowered by 100 ℃, and its NOx conversion could be up to 100 % at 570 ℃.

Key words: Rare-earth, Namometer perocakite, Coprecipitation, Catalytic ac tivity