Defects-healing of SAPO-34 membrane by post-synthesis modification using organosilica for selective CO2 separation

Yibing Mu, Huanhao Chen, Huan Xiang, Lan Lan, Yan Shao, Xiaolei Fan, Christopher Hardacre

Research output: Journal PublicationArticlepeer-review

21 Citations (Scopus)

Abstract

It is challenging to avoid the formation of defects in zeolite membranes during their preparation. Herein, we present a facile vacuum-assisted deposition (VAD) method as a feasible solution to address this challenge. Defective SAPO-34 membranes supported on tubular porous alumina were healed using bis(triethoxysilyl)ethane (BTESE)-derived organosilica via VAD, showing an improved performance in the selective CO2 separation from an equimolar CO2/CH4 mixture. Specifically, by controlling the amount of organosilica deposited, the coating was able to heal the non-selective defects in SAPO-34 membranes without compromising the CO2 permeance, but increased the CO2/CH4 selectivity notably (by a factor of ca. 2.5 at 25 °C and 200 kPa). An excessive coating of organosilica by VAD resulted in a thick layer on top of the SAPO-34 membrane which led to a significant decrease in the CO2 permeance. Additionally, a modified membrane was also investigated for the CO2/CH4 gas feed with different CO2 concentrations from 20 to 50 mol.% and this showed that a relatively concentrated CO2 in the system could improve the seperation performance of the developed membrane.

Original languageEnglish
Pages (from-to)80-88
Number of pages9
JournalJournal of Membrane Science
Volume575
DOIs
Publication statusPublished - 1 Apr 2019
Externally publishedYes

Keywords

  • CO separation
  • Defects-healing
  • Organosilica
  • SAPO-34 membrane
  • Vacuum-assisted deposition (VAD)

ASJC Scopus subject areas

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

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