Solid-state facilitated transport of carbon monoxide through mixed matrix membranes

Cheol Hun Park, Jae Hun Lee, Na Un Kim, Chang In Kong, Jeong Hoon Kim, Jong Hak Kim

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Abstract

Carbon monoxide (CO), along with CO2 and N2, forms a significant byproduct gas from steel mills. Here, we report, for the first time to the best of our knowledge, solid-state facilitated transport of CO based on mixed matrix membrane (MMM) consisting of comb copolymer-silver salt-MgO nanosheet (MgO-NS) complexes as solid-state CO carriers for the separation of CO/N2 and CO/CO2 mixtures. In particular, the structure and composition of the comb copolymer are crucial to membrane operation, and the desired structure is achieved by synthesizing poly(ethylene glycol) behenyl ether methacrylate-poly(methacrylic acid) (PEGBEM-PMA) comb copolymer. Subsequently, we compare its gas separation performance with those of poly(ethylene glycol) behenyl ether methacrylate-poly(oxyethylene methacrylate) (PEGBEM-POEM) comb copolymer and the commercial PEBAX block copolymer. The use of MgO-NS as the metal oxide enhances the activity and stability of silver ions via electrostatic interactions. We find that the PEGBEM-PMA membrane with a 7:3 wt ratio of AgBF4 and MgO-NS exhibits the highest CO separation performance with a CO permeance of 79 GPU (1 GPU = 10−6 cm3 (STP)/(s·cm2·cmHg)), CO/N2 selectivity of 14.7, and CO/CO2 selectivity of 12.0, which is the highest CO separation performance ever reported. The observed high CO/CO2 selectivity is an anomalous behavior that results from increased CO solubility by silver ions stabilized by MgO-NS and decreased CO2 permeance due to the presence of CO2-phobic PMA chains.

Original languageEnglish
Article number117373
JournalJournal of Membrane Science
Volume592
DOIs
Publication statusPublished - 2019 Dec 15

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All Science Journal Classification (ASJC) codes

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

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