Crystallization of high silica BEA by dry gel conversion

P. R. Hari Prasad Rao, K. Ueyama, Masahiko Matsukata

    Research output: Contribution to journalArticle

    82 Citations (Scopus)

    Abstract

    Zeolite with BEA structure was prepared using a new crystallization method called 'Dry Gel Conversion Technique'. This dry gel conversion technique is a convenient method to prepare zeolites and enables one to synthesize zeolite BEA with SiO2/Al2O3 ratios from 30 to infinity using tetraethylammonium hydroxide (TEAOH) as a structure directing agent. Zeolite BEA with SiO2/Al2O3 ratios from 30 to 730 were rapidly crystallized in 3 and 12 h, respectively. The 27Al NMR spectrum for BEA with SiO2/Al2O3 ratio of 30 confirmed the absence of octahedrally coordinated aluminum. The crystallization rates were higher for BEA with low SiO2/Al2O3 ratios than for those with high SiO2/Al2O3 ratios. BEA crystallized by this method had uniform particles of about 60 nm. Higher Na+ ion concentrations in the gel promoted the formation of high silica BEA. Elimination of occluded TEA cations took place at lower temperatures (around 623 K) in high silica BEA than that in BEA with low SiO2/Al2O3 ratios (around 900 K). This method also allowed to synthesize BEA in the form of self-bonded pellets.

    Original languageEnglish
    Pages (from-to)97-103
    Number of pages7
    JournalApplied Catalysis A: General
    Volume166
    Issue number1
    Publication statusPublished - 1998 Jan 2

    Fingerprint

    Zeolites
    Crystallization
    Silicon Dioxide
    Gels
    Silica
    Tetraethylammonium
    Positive ions
    Aluminum
    Nuclear magnetic resonance
    Cations
    Ions
    Temperature

    Keywords

    • Crystallization
    • Dry gel conversion
    • High silica zeolite
    • Self-bonded zeolite pellet
    • Zeolite BEA (beta)

    ASJC Scopus subject areas

    • Catalysis
    • Process Chemistry and Technology

    Cite this

    Crystallization of high silica BEA by dry gel conversion. / Hari Prasad Rao, P. R.; Ueyama, K.; Matsukata, Masahiko.

    In: Applied Catalysis A: General, Vol. 166, No. 1, 02.01.1998, p. 97-103.

    Research output: Contribution to journalArticle

    Hari Prasad Rao, PR, Ueyama, K & Matsukata, M 1998, 'Crystallization of high silica BEA by dry gel conversion', Applied Catalysis A: General, vol. 166, no. 1, pp. 97-103.
    Hari Prasad Rao, P. R. ; Ueyama, K. ; Matsukata, Masahiko. / Crystallization of high silica BEA by dry gel conversion. In: Applied Catalysis A: General. 1998 ; Vol. 166, No. 1. pp. 97-103.
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