A multi-dimensional quasi-zeolite with 12 × 10 × 7-ring channels demonstrates high thermal stability and good gas adsorption selectivity† †Electronic supplementary information (ESI) available: Synthesis, detailed structure description, structure refinement, NMR spectra, and CIFs. CCDC 1059012. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5sc04916d

A quasi-zeolite with three-dimensional 12 × 10 × 7-ring channels is synthesised and exhibits high thermal stability and good gas adsorption selectivity. A novel quasi-zeolite PKU-15, with a rare 3-dimensional structure containing interconnected large (12-ring), medium (10-ring) and small (7-ring) mu...

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Published in:Chemical science (Cambridge) 2016-01, Vol.7 (5), p.3025-3030
Main Authors: Liang, Jie, Xia, Wei, Sun, Junliang, Su, Jie, Dou, Maofeng, Zou, Ruqiang, Liao, Fuhui, Wang, Yingxia, Lin, Jianhua
Format: Article
Language:English
Subjects:
Chemistry
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Summary:A quasi-zeolite with three-dimensional 12 × 10 × 7-ring channels is synthesised and exhibits high thermal stability and good gas adsorption selectivity. 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 O 31 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 CO 2 .
ISSN:2041-6520
2041-6539
DOI:10.1039/c5sc04916d