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A multi-dimensional quasi-zeolite with 12 × 10 × 7-ring channels demonstrates 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 O2- anion is found to be encapsulated in the cage-like (Ge,Si)12O31 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 m2 g-1 and a good adsorption affinity toward CO2.

SUBMITTER: Liang J 

PROVIDER: S-EPMC6005135 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature

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A multi-dimensional quasi-zeolite with 12 × 10 × 7-ring channels demonstrates high thermal stability and good gas adsorption selectivity.

Liang Jie J   Xia Wei W   Sun Junliang J   Su Jie J   Dou Maofeng M   Zou Ruqiang R   Liao Fuhui F   Wang Yingxia Y   Lin Jianhua J  

Chemical science 20160125 5


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<sup>2-</sup> anion is found to be encapsulated in the cage-like (Ge,Si)<sub>12</sub>O<sub>31</sub> 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,  ...[more]

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