Yu Liang, Ullah Saif, Wang Hao, Xia Qibin, Thonhauser Timo, Li Jing
Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, 7098 Liuxian Blvd., Nanshan District, Shenzhen, Guangdong 518055, P. R. China.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
Angew Chem Int Ed Engl. 2022 Oct 17;61(42):e202211359. doi: 10.1002/anie.202211359. Epub 2022 Sep 20.
High-efficiency separation of C alkanes, particularly the mono- and dibranched isomers by using porous solids, is of paramount significance in the petrochemical industry and, remains a daunting challenge. In this work, we report the complete separation of linear/monobranched hexanes from their dibranched isomers through selective size-exclusion by a microporous MOF, Zn-tcpt (H tcpt=2,4,6-tris(4-carboxyphenoxy)-1,3,5-triazine), with a two-fold interpenetrated structure of hms nets. Importantly, its adsorption capacity and selectivity are notably higher than those of the previously reported adsorbents that can split mono- and dibranched alkane isomers. Dynamic breakthrough measurements verify the excellent separation of C alkane isomers by Zn-tcpt, and the size-exclusion based separation mechanism has been confirmed by ab initio materials modeling. The high-efficiency separation of alkane isomers by Zn-tcpt can be attributed to its optimal pore dimensions as well as high porosity.
使用多孔固体高效分离C烷烃，特别是单支链和双支链异构体，在石化工业中具有至关重要的意义，并且仍然是一项艰巨的挑战。在这项工作中，我们报告了通过具有hms网络双重互穿结构的微孔MOF Zn-tcpt（H tcpt = 2,4,6-三（4-羧基苯氧基）-1,3,5-三嗪）的选择性尺寸排阻，从其双支链异构体中完全分离线性/单支链己烷。重要的是，其吸附容量和选择性明显高于先前报道的能够分离单支链和双支链烷烃异构体的吸附剂。动态突破测量验证了Zn-tcpt对C烷烃异构体的优异分离效果，并且从头算材料建模证实了基于尺寸排阻的分离机制。Zn-tcpt对烷烃异构体的高效分离可归因于其最佳的孔径尺寸以及高孔隙率。
