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Journal of Materials Science

, Volume 30, Issue 22, pp 5777–5783 | Cite as

Characterization of Na-X, Na-A, and coal fly ash zeolites and their amorphous precursors by IR, MAS NMR and XPS

  • N. Shigemoto
  • S. Sugiyama
  • H. Hayashi
  • K. Miyaura
Papers

Abstract

By fusion with sodium hydroxide followed by a hydrothermal reaction, fly ash and Alenriched fly ash were converted into Na-X and Na-A zeolites, respectively. The authentic Na-X, Na-A and fly ash zeolites as well as their amorphous precursors have been characterized by IR, 29Si and 27Al MAS NMR, XPS/AES, TG, and comparative ion-exchange studies of Cs and K with Na in zeolite samples. It appears that the same structural unit with a terminal OH, such as a sodalite unit, was formed in the induction period of the hydrothermal reaction for Na-X and Na-A, and then cross-linked through D4R and D6R external linkages to build up the zeolite framework of Na-A and Na-X, respectively.

Keywords

Hydroxide Zeolite Material Processing Structural Unit Induction Period 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • N. Shigemoto
    • 1
  • S. Sugiyama
    • 1
  • H. Hayashi
    • 1
  • K. Miyaura
    • 2
  1. 1.Department of Chemical Science and TechnologyUniversity of TokushimaJapan
  2. 2.Shikoku Research Institute Inc.Japan

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