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PKU-20: A new silicogermanate constructed from sti and asv layers

DOI: 10.1016/j.micromeso.2015.12.052 DOI Help

Authors: Yanping Chen (College of Chemistry and Molecular Engineering, Peking University) , Jie Su (Stockholm University) , Shiliang Huang (Institute of Chemical Materials, China Academy of Engineering Physics) , Jie Liang (Peking University; Stockholm University) , Xiaohuan Lin (College of Chemistry and Molecular Engineering, Peking University) , Fuhui Liao (College of Chemistry and Molecular Engineering, Peking University) , Junliang Sun (Peking University; Stockholm University) , Yingxia Wang (College of Chemistry and Molecular Engineering, Peking University) , Jianhua Lin (College of Chemistry and Molecular Engineering, Peking University) , Hermann Gies (Department of Geology, Mineralogy and Geophysics, Ruhr University Bochum)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Microporous And Mesoporous Materials , VOL 224 , PAGES 384 - 391

State: Published (Approved)
Published: April 2016

Abstract: A new silicogermanate (PKU-20) was hydrothermally synthesized using triethylisopropylammonium cation as the structure directing agent in the presence of fluoride. Its structure was determined from a combination of synchrotron single crystal X-ray diffraction and powder X-ray diffraction data. PKU-20 crystallizes in the monoclinic space group C2/m, with the lattice parameters of a = 18.5901(6) Å, b = 13.9118 (4) Å, c = 22.2614 (7) Å and β = 100.1514 (12)°. The framework of PKU-20 is constructed from an alternate stacking of sti and asv layers. The sti layer is exactly the same as that in the STI framework,while the asv layer is a new layer sliced off from the ASV framework parallel to the (112) plane. The take-out scheme of the layer is discussed on the basis of a composite building unit “D4R-lau-D4R”. PKU-20 possesses a two-dimensional channel system, where the 10-ring channels parallel to the [010] direction are intercrossed by 12-ring pockets along the [101] direction.

Journal Keywords: PKU-20; STI framework; ASV framework; Silicogermanate; Hydrothermal synthesis

Subject Areas: Materials, Chemistry


Instruments: I19-Small Molecule Single Crystal Diffraction

Added On: 21/11/2016 11:29

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