EFFECT OF WATER VAPOR PRESSURE ON DE- AND REHYDRATION OF ZEOLITE ROCKS.

Atsushi Yamazaki, Sadao Tsutsumi, Ryohei Otsuka

    Research output: Contribution to journalArticle

    Abstract

    This paper investigated the effect of water vapor pressure on de- and rehydration of zeolite rocks and their cation exchanged forms. Mordenite tuff and clinoptilolite tuff from Japan was used as starting materials from which Na-, K-, Ca-, NH//4- and H-exchanged forms were prepared by cation exchange treatment. They were examined by X-ray, IR and thermal techniques. The wave number of the IR absorption band at about 3400 cm** minus **1 due to OH stretching vibration shifts linearly with increasing amount of cations. High temperature XRD reveals that the framework structures of the exchanged forms are maintained up to 450 degree C. TG curves obtained in an atmosphere of controlled P//H//2//O from 0 to 70. 6 mmHg indicate an hysteresis effect between de- and rehydration processes. In the case of H forms, de- and rehydration are not influenced by water vapor pressure and no hysteresis effect is observed above 200 degree C.

    Original languageEnglish
    Pages (from-to)39-48
    Number of pages10
    JournalWaseda Daigaku Rikogaku Kenkyusho Hokoku/Bulletin of Science and Engineering Research Laboratory,
    Issue number115
    Publication statusPublished - 1986

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    Vapor pressure
    Dehydration
    Water vapor
    Positive ions
    Rocks
    Hysteresis
    Stretching
    Absorption spectra
    Ion exchange
    X rays
    Temperature

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

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    abstract = "This paper investigated the effect of water vapor pressure on de- and rehydration of zeolite rocks and their cation exchanged forms. Mordenite tuff and clinoptilolite tuff from Japan was used as starting materials from which Na-, K-, Ca-, NH//4- and H-exchanged forms were prepared by cation exchange treatment. They were examined by X-ray, IR and thermal techniques. The wave number of the IR absorption band at about 3400 cm** minus **1 due to OH stretching vibration shifts linearly with increasing amount of cations. High temperature XRD reveals that the framework structures of the exchanged forms are maintained up to 450 degree C. TG curves obtained in an atmosphere of controlled P//H//2//O from 0 to 70. 6 mmHg indicate an hysteresis effect between de- and rehydration processes. In the case of H forms, de- and rehydration are not influenced by water vapor pressure and no hysteresis effect is observed above 200 degree C.",
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    AU - Yamazaki, Atsushi

    AU - Tsutsumi, Sadao

    AU - Otsuka, Ryohei

    PY - 1986

    Y1 - 1986

    N2 - This paper investigated the effect of water vapor pressure on de- and rehydration of zeolite rocks and their cation exchanged forms. Mordenite tuff and clinoptilolite tuff from Japan was used as starting materials from which Na-, K-, Ca-, NH//4- and H-exchanged forms were prepared by cation exchange treatment. They were examined by X-ray, IR and thermal techniques. The wave number of the IR absorption band at about 3400 cm** minus **1 due to OH stretching vibration shifts linearly with increasing amount of cations. High temperature XRD reveals that the framework structures of the exchanged forms are maintained up to 450 degree C. TG curves obtained in an atmosphere of controlled P//H//2//O from 0 to 70. 6 mmHg indicate an hysteresis effect between de- and rehydration processes. In the case of H forms, de- and rehydration are not influenced by water vapor pressure and no hysteresis effect is observed above 200 degree C.

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