Mixed-matrix membranes have great potential for post-combustion carbon capture. To make membrane-based carbon capture economically viable, new formulations with high selectivity and CO₂ permeance must be identified. We demonstrate here the ability to break the permeability-selectivity trade-off by using multicomponent mixed-matrix membranes (McMMMs) with two, three, or four components. Each of these components has a specific function and is designed for compatibility and high separation performance. A highly permeable polymer of intrinsic microporosity, PIM-1, and a CO₂-selective polyphosphazene polymer, MEEP80, are chosen as polymer matrices. Chemical interaction between MOF nanoparticles and polymers is a key factor for optimizing the MOF-polymer interfacial compatibility. The systematic study of the impact of MOF pore size and the binding site is investigated to produce 10 different composite membranes. The permeability-selectivity values surpass the Robeson upper bound, while the predicted cost of carbon capture is reduced, which suggests the potential of these membranes for practical CO₂ separations.

混合基质膜具有燃烧后碳捕获的巨大潜力。为了使基于膜的碳捕集在经济上可行，必须确定具有高选择性和CO ₂渗透性的新配方。我们在这里展示了通过使用具有两个，三个或四个组件的多组分混合基质膜（McMMM）来打破渗透率-选择性折衷的能力。这些组件中的每一个都有特定的功能，旨在实现兼容性和高分离性能。具有固有微孔性，PIM-1和CO _2的高渗透性聚合物选择性聚磷腈聚合物MEEP80被选作聚合物基质。MOF纳米粒子与聚合物之间的化学相互作用是优化MOF-聚合物界面相容性的关键因素。系统研究了MOF孔径和结合位点的影响，以生产10种不同的复合膜。渗透率-选择性值超过了Robeson上限，同时降低了碳捕获的预计成本，这表明这些膜在实际CO ₂分离中的潜力。