Enhancement of CO2/CH4 separation performances of 6FDA-based co-polyimides mixed matrix membranes embedded with UiO-66 nanoparticles

Zamidi Ahmad, M. ; Navarro, M. ; Lhotka, M. ; Zornoza, B. (Universidad de Zaragoza) ; Téllez, C. (Universidad de Zaragoza) ; Fila, V. ; Coronas, J. (Universidad de Zaragoza)

Resumen: Metal-organic frameworks (MOFs) incorporation into mixed matrix membranes (MMMs) is gaining more attention due to the combined advantages of high separation performance and easy processability. Nanoparticles (NPs) of CO2-philic MOF UiO-66 (Zr-BDC) were synthesized with high surface area and ca. 50 nm particle size (and also for comparison with 100 and 200 nm sizes). They were incorporated into three 6FDA-based co-polyimides (namely 6FDA-BisP, 6FDA-ODA, and 6FDA-DAM), forming MMMs with loadings in the 4–23 wt% range. The NPs and MMMs were characterized accordingly by XRD, BET, SEM, TEM, FTIR, and TGA. CO2 and CH4 isotherms on the NPs were measured by a static volumetric method at the pressure up to 10 bar. Fractional free volume (FFV) was calculated using solid density, measured by pycnometer. Gas separation performance was evaluated using a feed composition of 50%:50% CO2:CH4 binary mixture at 35 °C and a pressure difference of 2 bar. The presence of UiO-66 NPs in the continuous 6FDA-BisP and 6FDA-ODA co-polyimides improved both CO2 permeability and CO2/CH4 selectivity by 50–180% and 70–220%, respectively. In the case of 6FDA-DAM MMMs, the CO2 permeability was significantly improved by 92%, while maintaining the CO2/CH4 selectivity. The best results in terms of CO2/CH4 selectivity were 41.9 for 6FDA-BisP (17 wt% filler loading, 108 Barrer of CO2), 57.0 for 6FDA-ODA (7 wt% filler loading, 43.3 Barrer of CO2) and 32.0 for 6FDA-DAM (8 wt% filler loading, 1728 Barrer of CO2).

Idioma: Inglés

DOI: 10.1016/j.seppur.2017.10.039

Año: 2018

Publicado en: SEPARATION AND PURIFICATION TECHNOLOGY 192 (2018), 465-474
ISSN: 1383-5866

Factor impacto JCR: 5.107 (2018)

Categ. JCR: ENGINEERING, CHEMICAL rank: 14 / 138 = 0.101 (2018) - Q1 - T1

Factor impacto SCIMAGO: 1.158 - Filtration and Separation (Q1) - Analytical Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/FSE
Financiación: info:eu-repo/grantAgreement/ES/DGA/T05
Financiación: info:eu-repo/grantAgreement/EUR/EACEA-EC/ERASMUS MUNDUS-2009-2013
Financiación: info:eu-repo/grantAgreement/EUR/EACEA-EC/FPA-2011-0014
Financiación: info:eu-repo/grantAgreement/EUR/EACEA-EC/SGA-2012-1719
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2016-77290-R

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)