Zeolite (MFI) crystal morphology control using organic structure-directing agents

Griselda Bonilla, Isabel Díaz, Michael Tsapatsis, Hae Kwon Jeong, Yongjae Lee, Dionisios G. Vlachos

Research output: Contribution to journalArticlepeer-review

163 Citations (Scopus)


The effect of structure-directing agents (SDAs) on zeolite particle morphology and crystal structure was studied. Dimers and trimers of tetrapropylammonium hydroxide-the SDA of siliceous ZSM-5 (silicalite-1, structure type MFI)-lead to direct growth of the same framework but with drastically different crystal morphologies. Control over relative crystal growth rates along the three main crystallographic axes is demonstrated by obtaining crystals with their longest dimension along any of these axes. Unit cell dimensions and crystal structure were determined by refinement based on powder X-ray diffraction data and electron microscopy, respectively. The importance of the new morphologies in thin film molecular sieve technology along with possible crystal growth mechanisms is discussed.

Original languageEnglish
Pages (from-to)5697-5705
Number of pages9
JournalChemistry of Materials
Issue number26
Publication statusPublished - 2004 Dec 28

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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