Liang Jie, Xia Wei, Sun Junliang, Su Jie, Dou Maofeng, Zou Ruqiang, Liao Fuhui, Wang Yingxia, Lin Jianhua
College of Chemistry and Molecular Engineering , Peking University , Beijing , 100871 , China . Email:
Berzelii Center EXSELENT on Porous Materials and Inorganic and Structural Chemistry , Department of Materials and Environmental Chemistry , Stockholm University , Stockholm , 10691 , Sweden.
Chem Sci. 2016 May 1;7(5):3025-3030. doi: 10.1039/c5sc04916d. Epub 2016 Jan 25.
A novel quasi-zeolite PKU-15, with a rare 3-dimensional structure containing interconnected large (12-ring), medium (10-ring) and small (7-ring) multi-pore channels, was hydrothermally synthesised and characterised. A unique tri-bridging O anion is found to be encapsulated in the cage-like (Ge,Si)O building unit and energetically stabilises the PKU-15 framework. The removal of this oxygen atom would convert PKU-15 into a hypothetical zeolite PKU-15H. Thus, PKU-15 can be considered as a unique 'quasi-zeolite', which bridges porous germanates and zeolites. Owing to the absence of terminal Ge-OH groups in its structure, PKU-15 shows a remarkably high thermal stability of up to 600 °C. PKU-15 is also the first microporous germanate that exhibits permanent porosity, with a BET area of 428 m g and a good adsorption affinity toward CO.
一种新型的准沸石PKU - 15通过水热合成法制备并进行了表征，它具有罕见的三维结构，包含相互连接的大孔（12元环）、中孔（10元环）和小孔（7元环）多孔隙通道。研究发现一种独特的三桥连O阴离子被包裹在笼状的（Ge,Si）O构筑单元中，并在能量上稳定了PKU - 15骨架。去除这个氧原子会将PKU - 15转化为一种假设的沸石PKU - 15H。因此，PKU - 15可被视为一种独特的“准沸石”，它架起了多孔锗酸盐和沸石之间的桥梁。由于其结构中不存在末端Ge - OH基团，PKU - 15表现出高达600℃的显著高热稳定性。PKU - 15也是第一种表现出永久孔隙率的微孔锗酸盐，其BET比表面积为428 m²/g，对CO具有良好的吸附亲和力。
