A compact ZSM-5 membrane prepared without structure-directing agent

G. Li, E. Kikuchi, M. Matsukata

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Abstract

Compact ZSM-5 zeolite membranes have been prepared on the outer surface of a porous α-alumina tube without structure-directing agents (SDAs) by the seed-assisted crystallization method. An SDA-free gel and an SDA-free clear solution were used for the membrane preparation, respectively. ZSM-5 membranes prepared from the SDA-free gel showed the H2/i-C4H 10 ideal selectivity of 13.8 at 200°C, but it decreased to be 2.1 after the pretreatment at 300°C, indicating the limited thermal stability of this kind of ZSM-5 membrane. On the other hand, ZSM-5 membranes prepared from the SDA-free clear solution showed high thermal stability and good separation properties. After the pretreatment at 400°C, the H2/i-C 4H10 ideal selectivity was as high as 61 at 270°C. The maximum of the n/i-C4H10 ideal selectivity was 36 at 300°C and the separation factor was as high as 12.7 at 400°C for a 50/50 n/i-C4H10 mixture.

Original languageEnglish
Pages (from-to)620-625
Number of pages6
JournalStudies in Surface Science and Catalysis
Volume154 A
Publication statusPublished - 2004 Jan 1

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Keywords

  • Gas separation
  • High temperature
  • SDA-free
  • ZSM-5
  • Zeolite membrane

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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