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MOF‐on‐MOF Core–Shell Heterostructure With Synergistic Porous Interface for Highly Efficient Propane/Propylene Separation

Researchers have created a Ni‑MOF‑74@ZU‑609 core‑shell heterostructure that simultaneously delivers high propylene uptake and selectivity. Dynamic breakthrough tests show a record‑high selectivity of 5.51 and a capacity of 1.14 mmol g⁻¹ at 298 K and 1 bar, surpassing the performance of the individual parent MOFs. The synergistic interface between the adsorptive Ni‑MOF‑74 core and the ZU‑609 separation shell resolves the longstanding capacity‑selectivity trade‑off. This work establishes interfacial engineering as a versatile strategy for next‑generation gas‑separation materials.