Highly Ordered Nanochannels in a Nanosheet-Directed Thin Zeolite Nanofilm for Precise and Fast CO2 Separation

Bin Wang, Tangyin Wu, Miao Yu, Shiguang Li, Rongfei Zhou, Weihong Xing

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Precise molecular and ion separations depend largely on the size and uniformity of the nanochannels in a defect-free microporous nanofilm. Ordered and perpendicular nanochannels with uniform pore size are assembled into a continuous and defect-free film by a “gel nuclei-less” route. The ultrathin (<50 nm) zeolite nanosheets seeding layer induces the formation of defect-free zeolite nanofilms (500–800 nm) with preferential [100] orientation well-aligned to the transport pathway. The large-area and thin silicoaluminophosphate-34 (SAPO-34) nanofilm consisting of uniform and straight nanochannels shows a milestone CO2 permeance of ≈1.0 × 10−5 mol (m2 s Pa)−1 and high CO2/CH4 and CO2/N2 selectivities of 135 and 41 in equimolar binary mixtures at room temperature and 0.2 MPa feed pressure, respectively. These results suggest that highly oriented and thin SAPO-34 nanofilms prepared from nanosheets might have great potential for CO2 capture from natural gas, biogas, and flue gas.

Original languageEnglish
Article number2002836
JournalSmall
Volume16
Issue number41
DOIs
StatePublished - 1 Oct 2020

Keywords

  • CO separation
  • nanochannels
  • nanosheets
  • orientation
  • zeolite nanofilms

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