期刊
CHEMICAL SCIENCE
卷 7, 期 5, 页码 3025-3030出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sc04916d
关键词
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资金
- National Natural Science Foundation of China [21171009, 11275012, 21471009, 21321001]
- State Science and Technology Commission of China [2012CB224802, 2013CB933402]
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)(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 degrees 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.
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