高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (11): 2159.

• 研究论文 • 上一篇    下一篇

用正电子研究CuCl2在NaY上的扩散

朱俊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
  • 收稿日期:2001-10-30 出版日期:2002-11-24 发布日期:2002-11-24
  • 通讯作者: 朱　俊(1959年出生),男,博士,副教授,主要从事核固体物理及催化剂表征.E-mail:zhuj@whu.edu.cn E-mail:zhuj@whu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:10075037);湖北省自然科学基金资助

Dispersion of CuCl2 into NaY Zeolite Studied by Positrons

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

  1. 1. Department of Physics, Wuhan University, Wuhan 430072, China;
    2. Fushun Research Institute of Petroleum and Petrochemicals, Fushun 113001, China
  • Received:2001-10-30 Online:2002-11-24 Published:2002-11-24

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摘要： 用正电子湮没谱学研究了机械混合CuCl2与NaY中CuCl2在NaY沸石中的扩散.分别测量了不同质量比的CuCl2-NaY(0～0.03)沸石分子筛经140℃烘烤1h;CuCl2-NaY(0～0.05)经450℃烘烤4h;CuCl2-NaY(0.01)经不同温度烘烤1h以及经300℃下烘烤烘不同时间后的正电子寿命谱.所有谱中都出现了5(或4)个寿命分量,其第3,4,5寿命分量分别与β笼、超笼及沸石微粒界面空间的大小和数量相关.实验表明,正电子湮没谱学可敏感地探测出少量CuCl2在NaY沸石中的扩散变化.而对于只含少量氯化铜(0.01)的情况,虽经高温长时间烘烤,但仍有相当数量的氯化铜存在于NaY外表面.

关键词: 正电子湮没谱学, 氯化铜, 沸石

Abstract: A series of samples, prepared from mechanical mixtures of CuCl2 with NaY zeolite and resulting in the dispersion of CuCl2, was studied by positron annihilation spectroscopy. We measured the positron lifetime spectroscopy as a function of the weight ratio of the CuCl2-NaY zeolite heated at 140 ℃ for 1 h as well as at 450 ℃ for 4 h, respectively. We also measured it as a function of the heated temperature of 1 h, and as a function of the time heated at 300 ℃ for CuCl2-NaY(mass ratio 0.01). All lifetime spectras were resolved into five(or four) components, in which the third, the fourth and the fifth components were related to the annihilation in β cage, supercage and interface void, respectively. The experimental results showed that positron annihilation spectroscopy was sensitive to probe the change of the dispersion of a few of CuCl2 in NaY zeolite, and there was much CuCl2 remained on the outside surface of NaY after heated at high temperature for a long time even for a few of CuCl2.

Key words: Positron annihilation spectroscopy, Copper chloride, Zeolite

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