Zeolite synthesis in unstirred batch reactors II. Effect of non-uniform pre-mixing on the crystallization of zeolites A and X

Eric N. Coker, Anthony G. Dixon, Robert W. Thompson, Albert Sacco

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The effects of deliberate non-uniform pre-mixing of the aluminate and silicate solutions in the unstirred batch syntheses of zeolites A and X were studied. Poorly mixed hydrogels gave rise to impurity phases, with the amount of impurity decreasing with improved pre-mixing. Experiments were carried out in reactors specially designed for the growth of large zeolite crystals under microgravity conditions, and in a parallel study using high-density polyethylene bottles. Both studies evidenced the appearance of impurities if the hydrogel was not well mixed prior to heating. No consistent effect was observed on the particle size distributions of the zeolite products. These results underlined the importance of proper reactor design for unstirred syntheses, and the usefulness of a non-invasive diagnostic technique for mixing effectiveness, such as nuclear magnetic resonance (NMR) imaging. The applicability of NMR imaging to the systems studied here was demonstrated in Part I of this series.

Original languageEnglish
Pages (from-to)637-646
Number of pages10
JournalMicroporous Materials
Volume3
Issue number6
DOIs
StatePublished - Mar 1995

Keywords

  • Batch reactors
  • Impurities
  • Mixing
  • Non-invasive measurement
  • Zeolite synthesis

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