An Extrinsic-Pore-Containing Molecular Sieve Film: A Robust, High-Throughput Membrane Filter

Sungwon Hong, Yanghwan Jeong, Hionsuck Baik, Nakwon Choi, Alex C.K. Yip, Jungkyu Choi

Research output: Contribution to journalArticlepeer-review

Abstract

MFI type zeolites with 10-membered-ring pores (ca. 0.55 nm) have the ability to separate p-xylene (ca. 0.58 nm) from its bulkier isomers. Here, we introduced non-zeolitic micropores (ca. 0.6–1.5 nm) and mesopores (ca. 2–7 nm) to a conventional microporous MFI type zeolite membrane, yielding an unprecedented hierarchical membrane structure. The uniform, embedded non-zeolitic pores decreased defect formation considerably and facilitated molecular transport, resulting in high p-xylene perm-selectivity and molar flux. Specifically, compared to a conventional, crack network-containing MFI membranes of similar thickness (ca. 1 μm), the mesoporous MFI membranes showed almost double p-xylene permeance (ca. 1.6±0.4×10−7 mol m−2 s−1 Pa−1) and a high p-/o-xylene separation factor (ca. 53.8±7.3 vs. 3.5±0.5 in the conventional MFI membrane) at 225 °C. The embedded non-zeolitic pores allowed for decreasing the separation performance degradation, which was apparently related to coke formation.

Original languageEnglish
Pages (from-to)1323-1331
Number of pages9
JournalAngewandte Chemie - International Edition
Volume60
Issue number3
DOIs
Publication statusPublished - 2021 Jan 18

Keywords

  • MFI type zeolite membranes
  • defect-free membranes
  • hierarchical porous structure
  • non-zeolitic-pore-containing film
  • p-/o-xylene separations

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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