Synthesis of BEA by dry gel conversion and its characterization

P. R. Hari Prasad Rao, C. A. Leon Y Leon, K. Ueyama, Masahiko Matsukata

    Research output: Contribution to journalArticle

    63 Citations (Scopus)

    Abstract

    Zeolite BEA with SiO2/Al2O3 ratios ranging from 30 to 740 were crystallized at 413 and 453 K by the dry gel conversion technique. The particle size of the products increased with increasing SiO2/Al2O3 ratio as well as with increasing crystallization temperature. In as-synthesized BEA, the TEA+ ions interacting with Si-O- decomposed between 473 and 673 K and those interacting with Al-O- were cleaved between 673 and 798 K. During their elimination, the TEA+ ions interacting with Al-O- underwent higher degradation than those interacting with Si-O-. Chemical compositions showed the least influence on the fractions of decomposition product during the elimination between 473 and 673 K. The framework of H-BEA and NH4-BEA zeolites with SiO2/Al2O3 ratios ranging from 400 to 740 were stable even at 1373 K, whereas H-BEA with SiO2/Al2O3 = 30 was stable only up to 1173 K and became amorphous when calcined at 1373 K. After calcination at 1373 K, Na-BEA with SiO2/Al2O3 = 400 and 730 were transformed to tridymite (dense phase) whereas that with SiO2/Al2O3 = 30 became amorphous. The elimination of Na+ ions is necessary to have a BEA remain stable above 1173 K.

    Original languageEnglish
    Pages (from-to)305-313
    Number of pages9
    JournalMicroporous and Mesoporous Materials
    Volume21
    Issue number4-6
    Publication statusPublished - 1998 May

    Fingerprint

    Zeolites
    elimination
    Gels
    gels
    Ions
    synthesis
    ions
    products
    Crystallization
    zeolites
    Silicon Dioxide
    Calcination
    roasting
    chemical composition
    Particle size
    crystallization
    degradation
    Decomposition
    decomposition
    Degradation

    Keywords

    • Crystallization
    • Dry gel conversion
    • High silica zeolite
    • Interaction of TEA ions with zeolite
    • Thermal stability
    • Zeolite BEA (beta)

    ASJC Scopus subject areas

    • Catalysis
    • Materials Science(all)

    Cite this

    Hari Prasad Rao, P. R., Leon Y Leon, C. A., Ueyama, K., & Matsukata, M. (1998). Synthesis of BEA by dry gel conversion and its characterization. Microporous and Mesoporous Materials, 21(4-6), 305-313.

    Synthesis of BEA by dry gel conversion and its characterization. / Hari Prasad Rao, P. R.; Leon Y Leon, C. A.; Ueyama, K.; Matsukata, Masahiko.

    In: Microporous and Mesoporous Materials, Vol. 21, No. 4-6, 05.1998, p. 305-313.

    Research output: Contribution to journalArticle

    Hari Prasad Rao, PR, Leon Y Leon, CA, Ueyama, K & Matsukata, M 1998, 'Synthesis of BEA by dry gel conversion and its characterization', Microporous and Mesoporous Materials, vol. 21, no. 4-6, pp. 305-313.
    Hari Prasad Rao PR, Leon Y Leon CA, Ueyama K, Matsukata M. Synthesis of BEA by dry gel conversion and its characterization. Microporous and Mesoporous Materials. 1998 May;21(4-6):305-313.
    Hari Prasad Rao, P. R. ; Leon Y Leon, C. A. ; Ueyama, K. ; Matsukata, Masahiko. / Synthesis of BEA by dry gel conversion and its characterization. In: Microporous and Mesoporous Materials. 1998 ; Vol. 21, No. 4-6. pp. 305-313.
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