Formation process of *BEA-type zeolite membrane under OSDA-free conditions and its separation property

Motomu Sakai, Naoyuki Fujimaki, Genki Kobayashi, Noriyuki Yasuda, Yoshikazu Oshima, Masahiro Seshimo, Masahiko Matsukata

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Tubular zeolite *BEA membrane was prepared by a hydrothermal secondary growth method in the absence of an organic structure directing agent (OSDA). Membrane formation process was carefully observed by using FE-SEM, XRD, and N 2 adsorption, and the role of seed crystals on the support surface was discussed. Seed crystals loaded on the outer surface of a tubular porous alumina support partially dissolved and a small amount of seeds remained in an amorphous layer formed on the support surface in the early stage of secondary growth step. Subsequently, crystal growth of remaining crystals occurred, and a continuous *BEA layer was obtained following crystallization for 7 days at 393 K. In the secondary growth step, the supported seed layer played an important role in inducing the formation of a high local concentration in the vicinity of the support surface. The prepared OSDA-free *BEA membrane was then applied in the separation of hydrocarbons. We found that this membrane contained very few defects, and exhibited a high ideal selectivity for cyclohexane/1,3,5-trimethylbenzene mixture of 100, with cyclohexane permeance of 1.0 × 10 −7 mol m −2 s −1 Pa −1 based on molecular sieving effect at 623 K.

Original languageEnglish
Pages (from-to)360-365
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume284
DOIs
Publication statusPublished - 2019 Aug 1

Keywords

  • *BEA zeolite
  • Hydrocarbon separation
  • Membrane separation
  • OSDA-free synthesis

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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