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Evaluation of CH4/N2 separation performances on ultra-microporous FDCA-based MOFs using experimental and numerical methods.
- Source :
-
Microporous & Mesoporous Materials . Jun2024, Vol. 373, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- A comprehensive investigation was conducted to explore the adsorption behaviors of CH 4 over N 2 on ultra-microporous Al/Zr-FDCA frameworks, which were synthesized specifically using the eco-friendly and bio-sourced 2,5-furandicarboxylic acid (FDCA). Characterization results revealed that both Al-FDCA and Zr-FDCA exhibited similar specific surface area and surface groups, leading to comparable methane uptake per-unit mass at atmospheric pressure. However, the presence of Zr nodes generated ultra-micropores around 0.43 nm in size, leading to a pronounced affinity for CH 4. Zr-FDCA demonstrated a higher CH 4 /N 2 selectivity (8.90) calculated from the isotherms compared to Al-FDCA (3.86). Furthermore, breakthrough experiments indicated that under the same dynamic conditions, Zr-FDCA exhibited 1.5 times higher CH 4 uptake per unit volume and 2.5 times higher CH 4 /N 2 selectivity when compared to Al-FDCA. Initially, a four-step VPSA process was simulated to investigate the separation of CH 4 /N 2 mixture, in which the effects of feed-gas flow rate, adsorption time, adsorption pressure, and desorption pressure in VPSA cycle were extensively evaluated to enhance the purity and recovery of methane. Subsequently, a six-step process was employed for further optimization, achieving a purity of 95.9 % and a recovery of 99.1 %. The obtained results demonstrated the reliability of the established model and highlighted the significant potential of Zr-FDCA for CH 4 /N 2 separation. [Display omitted] • Ultra-microporous Al/Zr-FDCA MOFs with bio-sourced ligand synthesized for nature gas upgrading. • Zr-FDCA exhibits an excellent CH 4 /N 2 selectivity of 9.0, as 2.3 times as that of Al-FDCA at 298 K and 1 bar. • Dynamic CH 4 uptake and selectivity of per unit volume Zr-FDCA are 1.5 and 2.5 times as those of Al-FDCA. • Zr nodes had a significant impact on the pore size distribution and adsorption strength with methane. • CH 4 recovery and purity of the optimized six-step VPSA cycle reach 95.9 % and 99.1 % for Zr-FDCA. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ATMOSPHERIC pressure
*SURFACE area
Subjects
Details
- Language :
- English
- ISSN :
- 13871811
- Volume :
- 373
- Database :
- Academic Search Index
- Journal :
- Microporous & Mesoporous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 177107146
- Full Text :
- https://doi.org/10.1016/j.micromeso.2024.113136