Mixed matrix membranes (MMM) based on poly(ether-b-amide) or Pebax® as the matrix and MIL-53(Al)/NH₂-MIL-53(Al) metal–organic frameworks (MOF) as fillers were prepared by solution casting. The objective of the work was to determine the effect of MOF functionalization and concentration on the permeability and selectivity of different gases (CH₄, N₂, H₂ and CO₂). Scanning electron microscopy (SEM) confirmed that good particle dispersion up to the optimum content was obtained, while Fourier transform infrared spectroscopy (FTIR) confirmed the successful MOF inclusion in MMM. The MMM thermal and mechanical stability were verified by thermogravimetric (TGA) and dynamic mechanical (DMA) analyses, respectively. Finally, the gas separation performances were investigated via single gas and mixed gas permeation tests at 35 °C and 10 bar. The results show that CO₂ single gas permeability, as well as CO₂/CH₄ and CO₂/N₂ ideal selectivity, were enhanced by introducing either MIL-53(Al) or NH₂-MIL-53 (Al), while the highest CO₂ permeability (149 Barrer) was obtained at 10 wt% NH₂-MIL-53 with a 174% improvement over the neat Pebax® value. The highest ideal selectivity for CO₂/CH₄ and CO₂/N₂ was 23.3 (51% increase) and 59.4 (49% increase) also at 10 wt% MIL-53, respectively. Higher CO₂ permeability and selectivity was attributed to high porosity introduced by the presence of MOF, as well as the selective adsorption of CO₂ on MOF. For mixed gas results, it was found that 20 wt% NH₂-MIL-53 had significant CO₂/CH₄ separation performance, particularly at low CO₂ volume fraction (20 vol%) with a separation factor as high as 69.4. Overall, the results showed that MOF surface modification can be necessary under specific conditions.

制备了以聚（醚-b-酰胺）或Pebax®为基质并以MIL-53（Al）/ NH ₂ -MIL-53（Al）金属-有机骨架（MOF）为填充剂的混合基质膜（MMM）通过溶液浇铸。该工作的目的是确定MOF功能化和浓度对不同气体（CH ₄，N ₂，H ₂和CO _2）的渗透性和选择性的影响。）。扫描电子显微镜（SEM）证实可以达到最佳含量的良好颗粒分散性，而傅立叶变换红外光谱（FTIR）证实了成功将MOF包含在MMM中。MMM的热稳定性和机械稳定性分别通过热重分析（TGA）和动态力学分析（DMA）进行了验证。最后，通过在35°C和10 bar下的单一气体和混合气体渗透测试研究了气体分离性能。结果表明，通过引入MIL-53（Al）或NH ₂ -MIL-53（Al）可以提高CO ₂单一气体渗透率以及CO ₂ / CH ₄和CO ₂ / N ₂理想选择性。最高CO ₂NH ₂ -MIL-53的含量为10 wt％时，通透性（149 Barrer）比纯Pebax值提高了174％。在10wt％的MIL-53下，CO ₂ / CH ₄和CO ₂ / N ₂的最高理想选择性分别为23.3（增加51％）和59.4（增加49％）。较高的CO ₂渗透性和选择性归因于MOF的存在引起的高孔隙率，以及CO ₂在MOF上的选择性吸附。对于混合气体结果，发现20 wt％NH ₂ -MIL-53具有显着的CO ₂ / CH ₄分离性能，尤其是在低CO _2下体积分数（20 vol％），分离系数高达69.4。总体而言，结果表明，在特定条件下可能需要进行MOF表面改性。