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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.117  No.1363 (March) (2009)  >  pp.277-282

Journal of the Ceramic Society of Japan
<<Previous article Vol.117  No.1363 (March) (2009)   pp.277 - 282 Next article>>

Changes in the medium-range order during crystallization of aluminosilicate zeolites characterized by high-energy X-ray diffraction technique

Toru WAKIHARA1), Yasuhiro SUZUKI1), Wei FAN1), Seijiro SAITO1), Shinji KOHARA2), Gopinathan SANKAR3), Manuel SANCHEZ-SANCHEZ3), Masaru OGURA1) and Tatsuya OKUBO1)
1) Department of Chemical System Engineering, The University of Tokyo
2) Japan Synchrotron Radiation Research Institute and CREST-JST
3) Davy Faraday Research Laboratory, The Royal Institution of GB

  ZSM-5 and faujasite, which are aluminosilicate zeolites with different compositions, were synthesized without using organic structure-directing agents, and the changes in the medium-range order during the crystallization of ZSM-5 and faujasite were characterized by high-energy X-ray diffraction (HEXRD) technique. It is found that that the amorphous aluminosilicates have larger fraction of 4 membered ring (4R), compared to 6 membered ring (6R) that is the most dominant in amorphous silica. Furthermore, HEXRD measurements reveal that changes in the medium-range order are characteristic for each zeolite although crystallizations of both zeolites proceeded via a similar way: that is, the dissolution of amorphous precursors to solution followed by the nucleation and crystal growth of zeolite from the soluble species. In ZSM-5 crystallization, no major changes in the medium-range order are observed although slight decrease of the fraction of 4R is confirmed. On the other hand, clear changes in the medium-range order, especially on the ordering of 4R and 6R are confirmed in faujasite crystallization.

Zeolite, X-ray, diffraction, Crystallization, Crystal growth

Received: November 05, 2008
Accepted: December 18, 2008 , Published online: March 01, 2009
Copyright (c) 2009 The Ceramic Society of Japan



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