化学学报 ›› 2004, Vol. 62 ›› Issue (11): 1024-1028. 上一篇    下一篇

研究论文

用正电子湮没谱学研究氯化稀土在NaY沸石上的分散

朱俊1, 马莉1, 王少阶1, 罗锡辉2   

  1. 1. 武汉大学物理系, 武汉, 430072;
    2. 抚顺石油化工研究院, 抚顺, 113001
  • 投稿日期:2003-07-11 修回日期:2004-02-16 发布日期:2014-02-17
  • 通讯作者: 朱俊,E-mail:zhuj@whu.edu.cn E-mail:zhuj@whu.edu.cn
  • 基金资助:
    湖北省自然科学基金(No.2001s2071)及吉林大学无机合成与制备化学国家重点实验室资助项目.

Dispersion of Rare-earth Chloride in NaY Zeolite Studied by Positron Annihilation Spectroscopy

ZHU Jun1, MA Li1, WANG Shao-Jie1, LUO Xi-Hui2   

  1. 1. Department of Physics, Wuhan University, Wuhan 430072;
    2. Fushun Research Institute of Petroleum and Petrochemicals, Fushun 113001
  • Received:2003-07-11 Revised:2004-02-16 Published:2014-02-17

用正电子湮没谱学研究氯化富铈稀土与NaY沸石机械混合形成的稀土NaY沸石(RE-NaY)中,氯化稀土在NaY中的分散.分别测量不同质量比的RE-NaY(1%~20%)经500℃烘烤1 h,RE-NaY(5%)经过不同温度烘烤1 h,以及RE-NaY(5%)经500℃烘烤不同时间后的正电子寿命谱.所有寿命谱都出现了5个寿命分量,其中第3,4,5寿命分别与β笼、超笼及沸石微粒界面空洞的大小和数量相关.实验表明了正电子湮没谱学能敏感地表征氯化稀土在NaY中的分散.

关键词: 正电子湮没谱学, 稀土, 沸石

A series of samples of rare-earth NaY zeolite (RE NaY), prepared from mechanical mixtures of rare-earth chloride with NaY zeolite, were studied by positron annihilation spectroscopy. We measured the positron lifetime spectra as a function of the rare-earth chloride content in the RE-NaY heated at 500℃ for 1 h, as a function of the heating temperature with heating time of 1 h, and as a function of the heating time at 500℃ for RE NaY (5%), respectively. All lifetime spectra were resolved into five components, in which the third, the fourth and the fifth components are related to the ortho-positronium annihilation in sodalite cage, supercage and interface void, respectively. The experimental results showed that positron annihilation spectroscopy was sensitive to the change of the dispersion of rare-earth in NaY zeolite.

Key words: positron annihilation spectroscopy, rare-earth, zeolite