Asymmetric pore windows in MOF membranes for natural gas valorization
KAUST DepartmentAdvanced Catalytic Materials (ACM), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
Physical Science and Engineering (PSE) Division
Advanced Membranes and Porous Materials Research Center
Imaging and Characterization Core Lab
Chemical Science Program
Chemical Engineering Program
KAUST Catalysis Center (KCC)
Embargo End Date2022-12-22
Permanent link to this recordhttp://hdl.handle.net/10754/679289
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AbstractTo use natural gas as a feedstock alternative to coal and oil, its main constituent, methane, needs to be isolated with high purity1. In particular, nitrogen dilutes the heating value of natural gas and is, therefore, of prime importance for removal2. However, the inertness of nitrogen and its similarities to methane in terms of kinetic size, polarizability and boiling point pose particular challenges for the development of energy-efficient nitrogen-removing processes3. Here we report a mixed-linker metal–organic framework (MOF) membrane based on fumarate (fum) and mesaconate (mes) linkers, Zr-fum67-mes33-fcu-MOF, with a pore aperture shape specific for effective nitrogen removal from natural gas. The deliberate introduction of asymmetry in the parent trefoil-shaped pore aperture induces a shape irregularity, blocking the transport of tetrahedral methane while allowing linear nitrogen to permeate. Zr-fum67-mes33-fcu-MOF membranes exhibit record-high nitrogen/methane selectivity and nitrogen permeance under practical pressures up to 50 bar, removing both carbon dioxide and nitrogen from natural gas. Techno-economic analysis shows that our membranes offer the potential to reduce methane purification costs by about 66% for nitrogen rejection and about 73% for simultaneous removal of carbon dioxide and nitrogen, relative to cryogenic distillation and amine-based carbon dioxide capture.
CitationZhou, S., Shekhah, O., Ramírez, A., Lyu, P., Abou-Hamad, E., Jia, J., Li, J., Bhatt, P. M., Huang, Z., Jiang, H., Jin, T., Maurin, G., Gascon, J., & Eddaoudi, M. (2022). Asymmetric pore windows in MOF membranes for natural gas valorization. Nature, 606(7915), 706–712. https://doi.org/10.1038/s41586-022-04763-5
SponsorsWe gratefully acknowledge funding from King Abdullah University of Science and Technology and the CCF programme 1972. This work was also granted access to the HPC resources of CINES under the allocation A0100907613 made by GENCI.
PublisherSpringer Science and Business Media LLC