Ethanol/water mixture pervaporation performance of b-oriented silicalite-1 membranes made by gel-free secondary growth

Bahman Elyassi, Mi Young Jeon, Michael Tsapatsis, Katabathini Narasimharao, Sulaiman Nasir Basahel, Shaeel Al-Thabaiti

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

b-oriented silicalite-1 membranes on porous silica supports were synthesized using gel-free secondary growth. The porous silica supports were made by pressing crushed quartz fibers followed by sintering and polishing, and further modified by slip-coating three layers of Stöber silica particles (1000, 350, and 50 nm). The b-oriented seed layers were prepared by rubbing silicalite-1 particles (2 μm × 0.8 μm × 3 μm along a-, b-, and c-axis, respectively) after depositing a polymeric layer on the support. After silicalite-1 seed deposition, a final coating of spherical silica particles was applied. Well-intergrown, μm-thick, b-oriented membranes were obtained, which, after calcination, exhibited ethanol permselectivity in ethanol/water mixture pervaporation. At 60°C and for ∼5 wt % ethanol/water mixtures, the best membrane exhibited overall pervaporation separation factor of 85 (corresponding to membrane intrinsic selectivity of 7.7) and total flux of 2.1 kg/(m2·h). This performance is comparable to the best performing MFI membranes reported in the literature.

Original languageEnglish (US)
Pages (from-to)556-563
Number of pages8
JournalAIChE Journal
Volume62
Issue number2
DOIs
StatePublished - Feb 1 2016

Keywords

  • Ethanol
  • Gel-free crystal growth
  • Pervaporation
  • Silicalite-1
  • Zeolite membrane

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