Abstract The new ZIF named UZAR-S13 is formed by Zn2+ and 4(5)-(hydroxymethyl)imidazolate. UZAR-S13 has two distinct phases according to SEM and XRD: amorphous spheres and sheet crystals. UZAR-S13 and byproducts, with no N2 adsorption, rendered a notable CO2 uptake (up to 3.8 mmol g−1 at 30 bar and 0 °C), approaching values of known ZIFs. The most promising materials were included as fillers in mixed matrix membranes based on copolyimide 6FDA-DAM to study the separation of CO2/CH4, CO2/N2, H2/CO2 and H2/CH4 mixtures. The pore blocking hindered the gas flow of bulky molecules (CH4, N2 and CO2). The high CO2 adsorption on sheet crystals also contributed to the decrease in the permeability of CH4, N2 and CO2, giving poor selectivities. In contrast, the MMMs improved both the H2/CH4 selectivity (8.9–12.7 vs. 7.2) and permeability of H2 (544–597 vs. 505 Barrer) of the bare 6FDA-DAM membrane. This emphasizes the potential application of the fillers in the separation by molecular sieving of gas mixtures without CO2.

中文翻译：

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一种新型沸石羟甲基咪唑酯材料及其在基于 6FDA-DAM 的混合基质膜中的气体分离应用

摘要 由Zn2+和4(5)-(羟甲基)咪唑酯形成新型ZIF，命名为UZAR-S13。根据 SEM 和 XRD，UZAR-S13 具有两个不同的相：无定形球体和片状晶体。UZAR-S13 和副产品，没有 N2 吸附，产生了显着的 CO2 吸收（在 30 bar 和 0 °C 下高达 3.8 mmol g-1），接近已知 ZIF 的值。最有前途的材料被包括在基于共聚酰亚胺 6FDA-DAM 的混合基质膜中作为填料，以研究 CO2/CH4、CO2/N2、H2/CO2 和 H2/CH4 混合物的分离。孔隙阻塞阻碍了大分子（CH4、N2 和 CO2）的气流。片状晶体上的高 CO2 吸附也导致 CH4、N2 和 CO2 渗透率的降低，从而导致选择性差。相比之下，MMM 提高了 H2/CH4 选择性（8.9-12.7 对 7.2）和 H2 渗透率（544-597 对 7.2）。505 Barrer) 的裸 6FDA-DAM 膜。这强调了填料在通过分子筛分分离不含 CO2 的气体混合物中的潜在应用。