实现乙炔/乙烯分离在工业上是一个非常重要又极具挑战性的工作,是改善乙烯生产技术和提高产品质量的关键。目前使用的分离技术包括Pd催化剂进行乙炔氢化和有机溶剂萃取法，存在过度催化，高成本和高能耗等问题。具有裸露金属位点的金属M'-Salen在小分子识别和结构调整上彰显优势，本课题拟用它组装多孔混金属有机框架(Mixed metal-organic frameworks,M'MOFs)作为吸附剂，利用物理吸附实现乙炔/乙烯分离。但是M'-Salen的柔性造成材料稳定性差。我们独创性地提出通过改变高连接数金属M簇节点，获得刚性有机酸亚网格与柔性M'-Salen亚网格相互嵌套的模式，构筑稳定的三维框架。分别探寻嵌套式框架构建，裸露金属位点的识别效应和孔洞窗口的尺寸效应，以及它们之间的"协同关系"，优化合成路线，获得具有良好稳定性且分离材料显著的吸附材料。预期发表SCI 论文6-8篇，专利1-2项。

Separation of acetylene and ethylene is a very important but challenging industrial separation task. The highly separation techinque could improve the produt quality and the competitive ability for ethylene industry, a keystone of petrochemical industry. Current separation approaches include the partial hydrogenation of acetylene into ethylene over a supported Pd catalyst, and the extraction of cracked olefins using an organic solvent. Both routes are costly and energy consuming, especially the former may suffer from the over-hydrogenation to paraffins. This project aims to the self-assembly of microporous mixed metal-organic frameworks (M'MOFs) by empolying metal-Salen (M'-Salen) metalloligands, and their application in C2H4/C2H2 separation. Our previous work showed the M'MOFs on the base of the M'-Salen ligands exhibit impressive advantage in specific and selective recognization of the small gas molecules due to their open metal sites and structurally adjustable groups of M'-Salen, while the flexiblity of the M'-salen will make the frameworks distorded, even collapsed upon the removement of solvent. Heretofore, only few M'MOFs exhibit the permanent pores with N2 gas adsorption, and the N2 uptake is still very low. The instability of the M'MOFs limits their separation capacity and application. Our innovative and unique approach to reinforce frameworks and simultaneously improve separation capacity is to design Intersection Frameworks by modifying nodes of frameworks, wherein the subnets of rigid organic-acid ligands support the subnets of flexible M'-Salen metalloligands via sharing highly-connected metal (M)-cluster nodes. We will be focused on the preparation of the M'MOFs and the improvement of their C2H4/C2H2 separation capacity through the following considerations: 1) the construction of Interaction Frameworks, 2) the recognization of open metal sites, 3) size-exclusion effect of windows, and 4) the "collaborative effect" for the three aspects metioned. After the project is completed, we may publish 6-8 peer-reviewed papers in decent journals and file 1-2 patents.