Microstructural control of a SSZ-13 zeolite film via rapid thermal processing

Jinseong Kim, Eunhee Jang, Sungwon Hong, Dongjae Kim, Eunjoo Kim, Hannes Ricther, Adrian Simon, Nakwon Choi, Danil Korelskiy, Shahpar Fouladvand, Jaewook Nam, Jungkyu Choi

Research output: Contribution to journalArticle

Abstract

A SSZ-13 zeolite (CHA type zeolite having a pore size of 0.37 × 0.42 nm2) can separate CO2 (0.33 nm) from larger molecules (N2 (0.364 nm) or CH4 (0.38 nm)) because of the molecular size differences. However, methods to control the non-zeolitic defects of SSZ-13 membranes are lacking. Here, we demonstrate that rapid thermal processing (RTP) of as-synthesized SSZ-13 films tunes their microstructural defect properties and increases their CO2 separation ability. The maximum CO2/N2 separation factor (SF) at 30 °C increased from ~2.9 to ~4.8 due to RTP because the defective region was reduced. Furthermore, the addition of water vapor (the third main component of coal-fired power plant flue gas) to the feed markedly improved the CO2/N2 SF of the RTP-treated SSZ-13 membrane; from ~4.3 at 50 °C (a representative flue gas stream temperature) under dry conditions to ~10.1 under wet conditions (vs. ~1.6 across the conventionally calcined counterpart). Furthermore, the less-defective RTP-treated SSZ-13 membranes achieved a CO2/CH4 SF as high as ~43.7 under wet conditions at 50 °C. Fluorescence confocal optical microscopy analyses complemented with the permeation modeling revealed that the reduced defect size after RTP (~2.2 nm against ~3.9 nm for the conventionally calcined counterpart) improved the CO2 permselectivity, even though the defect porosities were low (~0.1%).

Original languageEnglish
Article number117342
JournalJournal of Membrane Science
Volume591
DOIs
Publication statusPublished - 2019 Dec 1

Keywords

  • Biogas separations
  • Post-combustion carbon capture
  • Rapid thermal processing
  • Secondary growth
  • SSZ-13 (CHA type) zeolite film

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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