A multi-dimensional quasi-zeolite with 12 × 10 × 7-ring channels demonstrates high thermal stability and good gas adsorption selectivity. Issue 5 (1st February 2016)

• Record Type: Journal Article
• Authors: Liang, Jie; Xia, Wei; Sun, Junliang; Su, Jie; Dou, Maofeng; Zou, Ruqiang; Liao, Fuhui; Wang, Yingxia; Lin, Jianhua
• Is Part Of: Chemical science. Volume 7:Issue 5(2016:May)
• Page Start: 3025
• Page End: 3030
• Publication Date: 2016-02-01
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5sc04916d
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : A quasi-zeolite with three-dimensional 12 × 10 × 7-ring channels is synthesised and exhibits high thermal stability and good gas adsorption selectivity. Abstract : 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 2− anion is found to be encapsulated in the cage-like (Ge, Si)12 O31 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 2 g −1 and a good adsorption affinity toward CO2 .