TY - JOUR
T1 - Ferrierite-poly(vinyl acetate) mixed matrix membranes for gas separation
T2 - A comparative study
AU - Atalay-Oral,
AU - Tokay, B.
AU - Erdem-Ṣenatalar, A.
AU - Tantekin-Ersolmaz, B.
N1 - Publisher Copyright:
© 2017 Elsevier Inc.
PY - 2018
Y1 - 2018
N2 - Ferrierite/PVAc mixed matrix membranes (MMMs) were prepared for O2/N2, CO2/CH4, and CO2/N2 separations and their performances were compared to those of silicalite-1, 4A, and 5A-filled PVAc membranes. The MMMs were characterized by XRD, SEM, and single gas permeation. The MMMs with 20% zeolite content was prepared without visible defects at the zeolite-polymer interface. Priming was employed at 40% zeolite loading to enhance zeolite-polymer adhesion except in the case of silicalite-1; silicalite-1 filled MMMs exhibited no significant defects even at 40 wt% loading without priming. Ferrierite addition into the PVAc matrix improved CO2 and CH4 permeabilities and CO2/N2 ideal selectivity with respect to the neat polymer, while O2 and N2 permeabilities decreased and O2/N2 and CO2/CH4 selectivities slightly increased with ferrierite addition. Ferrierite-PVAc MMMs at 40% loading yielded a CO2 permeability of 4 Barrer and a remarkably high CO2/N2 ideal selectivity of 80, possibly due to the strong interaction of CO2 molecules with the framework cations in ferrierite. Although the highest ideal O2/N2 selectivity was obtained for 4A-PVAc membranes, Si-PVAc membranes also exhibited high selectivity (8.1) towards O2 that was accompanied by a relatively higher O2 permeability, possibly due to solvent being trapped in the pores of the organophilic silicalite-1. This study shows that ferrierite, a zeolite more hydrophobic than zeolites 4A and 5A and with a pore aperture smaller than 5A and silicalite-1, is a promising candidate to be used as the dispersed phase in MMM fabrication for gas separation, in particular, separation of CO2 from industrial streams. Ferrierite may be promising especially in the case of humid feeds where hydrophilic zeolites and MOFs may fail or do not exhibit satisfactory performance.
AB - Ferrierite/PVAc mixed matrix membranes (MMMs) were prepared for O2/N2, CO2/CH4, and CO2/N2 separations and their performances were compared to those of silicalite-1, 4A, and 5A-filled PVAc membranes. The MMMs were characterized by XRD, SEM, and single gas permeation. The MMMs with 20% zeolite content was prepared without visible defects at the zeolite-polymer interface. Priming was employed at 40% zeolite loading to enhance zeolite-polymer adhesion except in the case of silicalite-1; silicalite-1 filled MMMs exhibited no significant defects even at 40 wt% loading without priming. Ferrierite addition into the PVAc matrix improved CO2 and CH4 permeabilities and CO2/N2 ideal selectivity with respect to the neat polymer, while O2 and N2 permeabilities decreased and O2/N2 and CO2/CH4 selectivities slightly increased with ferrierite addition. Ferrierite-PVAc MMMs at 40% loading yielded a CO2 permeability of 4 Barrer and a remarkably high CO2/N2 ideal selectivity of 80, possibly due to the strong interaction of CO2 molecules with the framework cations in ferrierite. Although the highest ideal O2/N2 selectivity was obtained for 4A-PVAc membranes, Si-PVAc membranes also exhibited high selectivity (8.1) towards O2 that was accompanied by a relatively higher O2 permeability, possibly due to solvent being trapped in the pores of the organophilic silicalite-1. This study shows that ferrierite, a zeolite more hydrophobic than zeolites 4A and 5A and with a pore aperture smaller than 5A and silicalite-1, is a promising candidate to be used as the dispersed phase in MMM fabrication for gas separation, in particular, separation of CO2 from industrial streams. Ferrierite may be promising especially in the case of humid feeds where hydrophilic zeolites and MOFs may fail or do not exhibit satisfactory performance.
KW - Ferrierite
KW - Gas separation
KW - Mixed matrix membranes
KW - Poly(vinyl acetate)
KW - Silicalite-1
KW - Zeolite A
UR - http://www.scopus.com/inward/record.url?scp=85030455776&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2017.09.026
DO - 10.1016/j.micromeso.2017.09.026
M3 - Article
AN - SCOPUS:85030455776
SN - 1387-1811
VL - 259
SP - 17
EP - 25
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -