TY - JOUR
T1 - Synthesis of tungsten-doped MFI zeolite membranes with improved performance for CO2/N2 separation
AU - Peng, Li
AU - Zhao, Li
AU - Pan, Guang
AU - Gu, Xuehong
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/6
Y1 - 2025/6
N2 - The separation of CO2 from N2 using MFI-type zeolite membranes relies on a mechanism dominated by adsorption and diffusion processes. In this investigation, we employed a tungsten (W) doping approach to elevate the CO2 separation selectivity of MFI zeolite membranes. Isothermal adsorption assessments demonstrated an elevated heat of adsorption (Qst) for CO2 and a reduced pore sizes after W doping, corroborating the enhanced CO2/N2 separation efficiency observed. Specifically, the W-doped MFI membrane exhibited a selectivity of 38.8 under dry conditions, a substantial improvement over the 8.7 selectivity achieved by the undoped Si-MFI membrane, while the CO2 permeance remained comparable (3.9 × 10−7 vs 4.5 × 10−7 mol m−2 s−1·Pa−1). Furthermore, the incorporation of tungsten curtails the formation of silanol groups by stabilizing the zeolite framework via energetically favorable W–O–Si linkages. These linkages diminish silanol-related defects, typically prone to water adsorption, thereby enhancing the membrane's hydrophobicity. Consequently, the W-doped MFI membrane maintains a CO2/N2 selectivity of 29.5 and a CO2 permeance of 1.8 × 10−7 mol m−2 s−1·Pa−1 in the humid environments, outperforming most reported zeolite membranes and showing potential ability for practical post-combustion carbon capture applications.
AB - The separation of CO2 from N2 using MFI-type zeolite membranes relies on a mechanism dominated by adsorption and diffusion processes. In this investigation, we employed a tungsten (W) doping approach to elevate the CO2 separation selectivity of MFI zeolite membranes. Isothermal adsorption assessments demonstrated an elevated heat of adsorption (Qst) for CO2 and a reduced pore sizes after W doping, corroborating the enhanced CO2/N2 separation efficiency observed. Specifically, the W-doped MFI membrane exhibited a selectivity of 38.8 under dry conditions, a substantial improvement over the 8.7 selectivity achieved by the undoped Si-MFI membrane, while the CO2 permeance remained comparable (3.9 × 10−7 vs 4.5 × 10−7 mol m−2 s−1·Pa−1). Furthermore, the incorporation of tungsten curtails the formation of silanol groups by stabilizing the zeolite framework via energetically favorable W–O–Si linkages. These linkages diminish silanol-related defects, typically prone to water adsorption, thereby enhancing the membrane's hydrophobicity. Consequently, the W-doped MFI membrane maintains a CO2/N2 selectivity of 29.5 and a CO2 permeance of 1.8 × 10−7 mol m−2 s−1·Pa−1 in the humid environments, outperforming most reported zeolite membranes and showing potential ability for practical post-combustion carbon capture applications.
KW - CO capture
KW - CO/N separation
KW - Humid condition
KW - MFI zeolite membrane
KW - Tungsten doping
UR - http://www.scopus.com/inward/record.url?scp=105004263980&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2025.124185
DO - 10.1016/j.memsci.2025.124185
M3 - 文章
AN - SCOPUS:105004263980
SN - 0376-7388
VL - 729
JO - Journal of Membrane Science
JF - Journal of Membrane Science
M1 - 124185
ER -