Synthesis and gas permeation properties of sodalite membranes

Zhenkun Zheng, Vadim Guliants, Jerry Lin, Mark A. Snyder, Dionisios G. Vlachos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Sodalite (SOD) zeolite membranes are highly promising for hydrogen separation from larger gas molecules due to the presence of small ∼2.8Å pores formed by the six-membered rings of the SOD cages. Low-silica (Si/Al =1) SOD membranes were synthesized on alpha-alumina supports by in-situ crystallization from the Na2O-SiO2-Al2O3-H2O solutions employing different aluminum chemical sources and different support positions. The SOD membrane layers exhibited spherical and cubic crystal shapes. XRD, SEM/EDS, and TGA were used to investigate the phase composition, microstructure and thermal behavior of sodalite membranes and powders. In addition, fluorescence confocal optical microscopy (FCOM), a non destructive imaging technique, was employed to collect serial optical images as a function of distance from the top surface of the SOD membranes in order to visualize their detailed microstructure and infer their growth mechanism as a function of time. After dehydration the membranes were characterized by single-gas H2, N2 and CO2 permeation at 323-473K and exhibited the H2/N2 and H2/CO2 permselectivity of ∼3 and ∼4, respectively. The low H2/N2 and H2/CO2 selectivities observed indicated the presence of macroscopic defects confirmed by SEM and FCOM that were caused by the presence of zeolite impurities and dehydration behavior of these membranes.

Original languageEnglish (US)
Title of host publicationAIChE Annual Meeting, Conference Proceedings
Pages2285
Number of pages1
StatePublished - 2005
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: Oct 30 2005Nov 4 2005

Other

Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
CountryUnited States
CityCincinnati, OH
Period10/30/0511/4/05

Keywords

  • Confocal microscopy
  • Hydrogen separation
  • Permeance
  • Sodalite membrane

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Zheng, Z., Guliants, V., Lin, J., Snyder, M. A., & Vlachos, D. G. (2005). Synthesis and gas permeation properties of sodalite membranes. In AIChE Annual Meeting, Conference Proceedings (pp. 2285)