In the present work, melem based catalysts with various functional groups were developed by the modification of melem oligomers and tested for the chemical fixation of CO₂ into cyclic carbonates. The characterization of these catalysts, by means of SEM, BET, XRD, IR, TG and XPS, verified the functional groups are successfully incorporated into the melem oligomers structure. Activity test demonstrated that melem oligomers grafted with both hydroxyl and quaternary ammonium groups (MOSB) presented the best catalytic performance. A propylene oxide conversion of 97.4% and propylene carbonate selectivity of 97.8% were obtained under the optimal reaction conditions. The simultaneous existence of edge defects, hydroxyl groups and quaternary ammonium groups in the structure of the catalyst are responsible for the high performance of MOSB. These three groups synergistically catalyzed the chemical fixation of CO₂ to proceed with high efficiency. Moreover, moderate yield could still be obtained after five cycles. A possible reaction mechanism was proposed for the cycloaddition of CO₂ with epoxides to form cyclic carbonates.

在目前的工作中，通过修饰melem低聚物开发了具有各种官能团的基于melem的催化剂，并测试了其对CO ₂的化学固定作用。变成环状碳酸盐。通过SEM，BET，XRD，IR，TG和XPS对这些催化剂进行表征，证实了官能团已成功地掺入了melem低聚物结构中。活性测试表明，同时接有羟基和季铵基团（MOSB）的蜜勒姆低聚物表现出最佳的催化性能。在最佳反应条件下，环氧丙烷的转化率为97.4％，碳酸丙烯酯的选择性为97.8％。催化剂结构中同时存在边缘缺陷，羟基和季铵基团是MOSB高性能的原因。这三个基团协同催化CO ₂的化学固定高效率地进行。而且，在五个循环后仍可获得中等产量。提出了一种可能的反应机理，用于将CO ₂与环氧化物环加成形成环状碳酸酯。