Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (9): 1793.

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Dielectric Relaxation Spectroscopy Study on NaA Zeolite in the Process of Ion Exchange

ZHOU Wei1,2, ZHAO Kong-Shuang1*   

  1. 1. College of Chemistry, Beijing Normal University, Beijing 100875, China;
    2. College of Chemistry and Environmental Engineering, Beijing Technology and Business University, Beijing 100048, China
  • Received:2008-11-28 Online:2009-09-10 Published:2009-09-10
  • Contact: ZHAO Kong-Shuang. E-mail: zhaoks@bnu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20673014 )资助.

Abstract:

The dielectric properties of NaA zeolite with different ion exchange degree were measured by DRS in the frequency range from 40 Hz to 110 MHz, and Cole-Cole equation and Hanai method were used to attain the dielectric and phase parameters. The results indicate that the dielectric increment, relaxation time, relaxation time distribution parameter and conductivity of particle decrease with ion exchange degree increasing. At the same time, the dielectric constant of particle is independent on the ion exchange degree. By meaning of comprehensive dielectric analysis, the crystal lattice located by Ca2+ is infered to six-ring site, Ca2+ at six-ring site and Na+ at eight-ring site are equivalent on the contribution to the polarization of zeolite particle, and the electric field becomes various with Ca2+ exchange.

Key words: Dielectric relaxation spectroscopy; NaA Zeolite; Ion exchange

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