A multi-dimensional quasi-zeolite with 12 x 10 x 7-ring channels demonstrates high thermal stability and good gas adsorption selectivity
2016 (English)In: Chemical Science, ISSN 2041-6520, E-ISSN 2041-6539, Vol. 7, no 5, 3025-3030 p.Article in journal (Refereed) PublishedText
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.
Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016. Vol. 7, no 5, 3025-3030 p.
Molecular-Sieve, Crystal-Structure, Electron Crystallography, Hydrothermal Synthesis, Rietveld Refinement, Powder Diffraction, Framework, Phase, Octadecasil, Topology
IdentifiersURN: urn:nbn:se:kth:diva-187856DOI: 10.1039/c5sc04916dISI: 000374859300008ScopusID: 2-s2.0-84966430815OAI: oai:DiVA.org:kth-187856DiVA: diva2:931926
QC 201605312016-05-312016-05-302016-05-31Bibliographically approved