화학공학소재연구정보센터
Inorganic Chemistry, Vol.59, No.6, 3912-3918, 2020
Zeolitic Metal Cluster Carboxylic Framework for Selective Carbon Dioxide Chemical Fixation through the Superlarge Cage
Metal-organic frameworks (MOFs) with zeolitic structure process fantastic structural metrics and display excellent applications in many aspects; however, they are difficult to assemble. Herein, on the basis of a tetrahedral Zn4O cluster and a 3,5-bis(2,4-dicarboxylphenyOnitrobenzene (H4L) ligand, a novel sodalite (SOD) zeolitic cluster framework (ZCF), {[Zn-4(O)(L)(2)]center dot 4DMF center dot 6H(2)O}(n) (ZCF-1; DMF = N,N-dimethylformamide), has been hydrothermally synthesized. Compared with the traditional SOD zeolitic framework of ZIF-8, the cage size of ZCF-1 is dramatically improved from 16.9 to 29.2 angstrom by the introduction of longer tetradentate carboxylic ligands. Moreover, because of the functional nitryl group in the ligand, ZCF-1 exhibits a high CO2/CH4 selectivity. Hence, further research on the chemical fixation of CO2 is implemented, which reveals excellent heterogeneous catalytic activity and durability. Especially, a unique selective catalytic performance with a high yield of 88.3% on a larger molecular size reactant (glycidyl phenyl ether) is observed, which is attributed to the stereoselection effect of the superlarge cage and abundant Zn4O catalytic clusters in ZCF-1.