Inserting V-Shaped Bidentate Partition Agent into MIL-88-Type Framework for Acetylene Separation from Acetylene-Containing Mixtures
作者:Ting Chen、Yingxiang Ye、Ming Yin、Liangji Chen、Zhijun Ke、Junzhi Guo、Mengxin Zhang、Zizhu Yao、Zhangjing Zhang、Shengchang Xiang
DOI:10.1021/acs.cgd.9b01735
日期:2020.3.4
The separation of light hydrocarbon mixtures, especially for acetylene-containing mixtures, is in urgent demand to prepare chemical feedstocks and fuels. Here, we have prepared a new 8-connected metal–organic framework (termed as FJU-99), by employ the well-defined pore space partition (PSP) strategy. Unlike the pacs (partitioned acs net) framework using C3-symmetric partition agent, this framework uses a V-shaped bidentate partition agent (ADPT = 2-amino-4,6-dipyriadl-1,3,5-triazines). After inserting the V-shaped bidentate ligand, the large hexagonal channel has been divided into numerous finite segments. Notably, the activated FJU-99a features permanent porosity with a Brunauer–Emmett–Teller (BET) surface area of 802.5 m2 g–1, remarkably higher than the mother framework MIL-88. Ideal adsorbed solution theory (IAST) reveals that FJU-99a shows excellent selectivity toward C2H2/CH4 and C2H2/CO2 at 296 K. Laboratorial breakthrough experiments also attested that the PSP framework is promising for the separation of C2H2/CH4 and C2H2/CO2.
分离轻烃混合物,特别是含乙炔的混合物,是制备化学原料和燃料的迫切需要。在此,我们采用定义明确的孔隙空间分区(PSP)策略,制备了一种新的 8 连接金属有机框架(称为 FJU-99)。与使用 C3 对称分区剂的 pacs(partitioned acs net)框架不同,该框架使用的是 V 形双叉分区剂(ADPT = 2-氨基-4,6-二(dipyriadl)-1,3,5-三嗪)。插入 V 形双齿配体后,大六边形通道被分割成许多有限的片段。值得注意的是,活化的 FJU-99a 具有永久孔隙率,其布鲁纳-埃美特-泰勒(BET)比表面积为 802.5 m2 g-1,明显高于母框架 MIL-88。理想吸附溶液理论(IAST)显示,FJU-99a 在 296 K 时对 C2H2/CH4 和 C2H2/CO2 具有极佳的选择性。