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

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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.

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Authors and Affiliations

  1. Department of Chemical Science and Technology, University of Tokushima, 2-1 Minamijosanjima, 770, Japan

    N. Shigemoto, S. Sugiyama & H. Hayashi

  2. Shikoku Research Institute Inc., 2109 Yashima-nishimachi Takamatsu, 761-01, Japan

    K. Miyaura

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  1. N. Shigemoto
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  2. S. Sugiyama
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  3. H. Hayashi
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  4. K. Miyaura
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Shigemoto, N., Sugiyama, S., Hayashi, H. et al. Characterization of Na-X, Na-A, and coal fly ash zeolites and their amorphous precursors by IR, MAS NMR and XPS. JOURNAL OF MATERIALS SCIENCE 30, 5777–5783 (1995). https://doi.org/10.1007/BF00356720

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  • DOI: https://doi.org/10.1007/BF00356720

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