A comparative study on permeation and mechanical properties of random and oriented MFI-type zeolite membranes

Jessica O'Brien-Abraham, Masakoto Kanezashi, Y. S. Lin

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Changes to microstructure of a zeolite membrane can affect defect formation, degree of intergrowth, stability, and performance of the membrane. In this work, random, c- and h,0,h-oriented membranes are synthesized under similar conditions (i.e. same structure directing agent, seed layer solution, calcination procedure) and characterized with performance based methods. Moderate ideal selectivities for H2/SF6 around 20 were observed for those membranes most effected by defects induced during the template removal step including both the random and h,0,h-oriented membranes. In contrast, the c-oriented membrane was less susceptible to crack formation and showed H2/SF6 selectivity around 46. Single component pervaporation studies yielded no ideal selectivity for p-xylene over o-xylene for random membranes while a selectivity of 2-3 was observed for the oriented membranes. Furthermore, membrane degradation was observed in all microstructures of MFI membranes that were subjected to pervaporation experiments and subsequent heat treatment to remove the adsorbed xylenes. It is believed that this effect is due structural deformations induced by high loadings of adsorbed xylene which upon burn out cause permanent damage to the membrane.

Original languageEnglish (US)
Pages (from-to)140-148
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume105
Issue number1-2
DOIs
StatePublished - Sep 15 2007

Keywords

  • Gas permeation
  • MFI-type zeolite membranes
  • Microstructure
  • Pervaporation

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'A comparative study on permeation and mechanical properties of random and oriented MFI-type zeolite membranes'. Together they form a unique fingerprint.

  • Cite this