Effects of Exchangeable Cations on The Thermal Behavior of Fibrous Zeolites

Atsushi Yamazaki, R. Otsuka

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Intermediate phases in the natrolite series (natrolite, mesolite and scolecite) are produced by (Na, Ca)-exchange treatment, and their dehydration behaviors are investigated. The lattice parameters of these products change linearly as a function of Na2O ratio (Na2O/(Na2O+CaO+K2O) mole ratio). The dehydration behavior for each phase changes continuously with Na2O ratio. The effect of exchangeable cations on the thermal stability of fibrous zeolites are also studied. These zeolites containing divalent cations such as Ca2+ and Ba2, become amorphous upon dehydration, while those having only monovalent cations such as Na+ and K+ transform into dehydrated phases, and subsequently lose their crystallinity at higher temperatures. The difference in thermal stability is interpreted in terms of difference in the population and distribution of exchangeable cations in the alumino-silicate framework.

    Original languageEnglish
    Pages (from-to)533-542
    Number of pages10
    JournalStudies in Surface Science and Catalysis
    Volume49
    Issue numberC
    DOIs
    Publication statusPublished - 1989

    Fingerprint

    Zeolites
    Dehydration
    zeolites
    Cations
    Positive ions
    dehydration
    cations
    Thermodynamic stability
    Silicates
    Monovalent Cations
    thermal stability
    Divalent Cations
    Lattice constants
    Ion exchange
    lattice parameters
    silicates
    crystallinity
    Hot Temperature
    sodium oxide
    products

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Catalysis
    • Physical and Theoretical Chemistry
    • Materials Chemistry
    • Surfaces, Coatings and Films

    Cite this

    Effects of Exchangeable Cations on The Thermal Behavior of Fibrous Zeolites. / Yamazaki, Atsushi; Otsuka, R.

    In: Studies in Surface Science and Catalysis, Vol. 49, No. C, 1989, p. 533-542.

    Research output: Contribution to journalArticle

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