In this study, polyetherimide (Ultem) was chosen as a polymeric matrix, and micron-sized Ni²⁺-exchanged nano-porous NaX zeolite was selected as an inorganic filler to fabricate novel mixed matrix membranes (MMMs) for CO₂ separation. Fabricated membranes were evaluated by Differential scanning calorimeter, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray. The influences of filler loading (0–5 wt.%) and feed pressure (2–10 bar) on gas separation properties were surveyed. CO₂/N₂ ideal selectivity of 3 wt.% NiX loaded MMM (optimum MMM) was increased to 34 (about 36%) compared to 25 for the pristine membrane. Furthermore, CO₂ permeability was improved by about 45%, from 1.3 Barrer for the pure membrane to 1.88 Barrer for MMM containing 3 wt.% functionalized filler. These improvements originate from a combination of the inherent surface diffusion mechanism of zeolite X and reversible reaction between free orbitals of transition metal ions (Ni²⁺) and electron pairs of CO₂ molecules. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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结合 Ni2+ 交换沸石 X 的新型 Ultem 基混合基质膜的 CO2 分离

在这项研究中，选择聚醚酰亚胺（Ultem）作为聚合物基质，并选择微米尺寸的Ni ²⁺交换纳米多孔NaX沸石作为无机填料，制备用于CO ₂分离的新型混合基质膜（MMM）。通过差示扫描量热仪、傅里叶变换红外光谱、X射线衍射、扫描电子显微镜和能量色散X射线对制备的膜进行评估。调查了填料装载量（0-5 wt.%）和进料压力（2-10 bar）对气体分离性能的影响。与原始膜的 25 相比，3 wt.% NiX 负载 MMM（最佳 MMM）的CO ₂ /N ₂理想选择性增加到 34（约 36%）。此外，CO ₂渗透性提高了约 45%，从纯膜的 1.3 Barrer 到含有 3 wt.% 功能化填料的 MMM 的 1.88 Barrer。这些改进源于沸石X固有的表面扩散机制和过渡金属离子(Ni ^{2+ )的自由轨道与CO} ₂分子的电子对之间的可逆反应的结合。© 2021 化学工业协会和 John Wiley & Sons, Ltd.