TY - JOUR
T1 - High-performance 7-channel monolith supported SSZ-13 membranes for high-pressure CO2/CH4 separations
AU - Li, Yanmei
AU - Wang, Yulei
AU - Guo, Mingyang
AU - Liu, Bo
AU - Zhou, Rongfei
AU - Lai, Zhiping
N1 - KAUST Repository Item: Exported on 2021-04-05
Acknowledgements: We gratefully acknowledge the financial support of this study from Natural Science Foundations of China (No. 21938007, 21576131 and 21921006).
PY - 2021/3/18
Y1 - 2021/3/18
N2 - Continuous SSZ-13 zeolite membranes were reproducibly synthesized on the inner surface of 7-channel monolith supports for the first time. Packing density and mechanical strength were much greater than those using normal tubular and disc membranes. The membrane in the central channel of monolith was thinner than these of the side channels. The best monolith supported SSZ-13 membrane (with spacers) showed a CO2/CH4 selectivity of 72 and a CO2 permeance of 163 × 10-8 mol/(m2 s Pa) at pressure drop of 2.0 MPa and feed flow rate of 20 standard L/min for an equimolar CO2/CH4 mixture. Such separation performance was higher than most of zeolite membranes prepared on single-channel tubes or discs. The effects of temperature, pressure drop and fluid state on separation performance of the membranes were investigated. The extent of concentration polarization through monolith supported membrane was modelled by the concentration polarization index (CPI). Increasing feed flow rate and inserting spacers into the channels were effective ways to reduce the negative influence of concentration polarization. The latter way was more effective for our monolith supported membranes than the former because the dead volume was reduced greatly. Carbon dioxide permeance and CO2/CH4 selectivity increased by 24% and 85%, respectively, when the CPI increased from 0.79 (without spacer) to 0.89 (with spacer) at feed flow rate of 20 standard L/min.
AB - Continuous SSZ-13 zeolite membranes were reproducibly synthesized on the inner surface of 7-channel monolith supports for the first time. Packing density and mechanical strength were much greater than those using normal tubular and disc membranes. The membrane in the central channel of monolith was thinner than these of the side channels. The best monolith supported SSZ-13 membrane (with spacers) showed a CO2/CH4 selectivity of 72 and a CO2 permeance of 163 × 10-8 mol/(m2 s Pa) at pressure drop of 2.0 MPa and feed flow rate of 20 standard L/min for an equimolar CO2/CH4 mixture. Such separation performance was higher than most of zeolite membranes prepared on single-channel tubes or discs. The effects of temperature, pressure drop and fluid state on separation performance of the membranes were investigated. The extent of concentration polarization through monolith supported membrane was modelled by the concentration polarization index (CPI). Increasing feed flow rate and inserting spacers into the channels were effective ways to reduce the negative influence of concentration polarization. The latter way was more effective for our monolith supported membranes than the former because the dead volume was reduced greatly. Carbon dioxide permeance and CO2/CH4 selectivity increased by 24% and 85%, respectively, when the CPI increased from 0.79 (without spacer) to 0.89 (with spacer) at feed flow rate of 20 standard L/min.
UR - http://hdl.handle.net/10754/668487
UR - https://linkinghub.elsevier.com/retrieve/pii/S0376738821002271
UR - http://www.scopus.com/inward/record.url?scp=85103115399&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2021.119277
DO - 10.1016/j.memsci.2021.119277
M3 - Article
SN - 1873-3123
VL - 629
SP - 119277
JO - Journal of Membrane Science
JF - Journal of Membrane Science
ER -