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PKU-21: A Novel Layered Germanate Built from Ge₇ and Ge₁₀ Clusters for CO₂ Separation

DOI: 10.1002/chem.201704573 DOI Help

Authors: Jie Liang (Beihang University) , Jie Su (Stockholm University) , Fei Peng (Stockholm University) , Yongfei Zeng (Tianjin Normal University) , Junliang Sun (Peking University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry - A European Journal

State: Published (Approved)
Published: November 2017
Diamond Proposal Number(s): 8833

Abstract: The attractive properties of layered inorganic materials, which make them suitable for numerous applications in chemical industries and life sciences, originated from their crystalline framework structures. Here we report a new layered germanate PKU-21, which was prepared by the hydrothermal synthesis method using 2-propanolamine (MIPA) as the structure-directing agent. The structure of PKU-21 was determined from synchrotron single crystal X-ray diffraction and synchrotron powder X-ray diffraction data. It reveals a complicated framework structure containing 18 unique Ge atoms in the asymmetric unit. PKU-21 is the first layered germanate built from both Ge₇ and Ge₁₀ clusters, following the 3-dimensional germanate PKU-17. The preparation and structure of PKU-21 are discussed in comparison with PKU-17, which provides new insight into the formation mechanism of germanates. Gas sorption experiments indicate that the layered PKU-21 sample exhibits a better CO₂ sorption selectivity over N₂ and CH₄ at 298 K than at 273 K, making it a promising candidate for CO₂ separation.

Journal Keywords: Layered germanates; Structure elucidation; crystal growth; cluster compounds; CO2 separation

Subject Areas: Chemistry

Instruments: I19-Small Molecule Single Crystal Diffraction

Added On: 17/11/2017 10:15

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