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PKU‐21: A Novel Layered Germanate Built from Ge 7 and Ge 10 Clusters for CO 2 Separation
Author(s) -
Liang Jie,
Su Jie,
Peng Fei,
Zeng Yongfei,
Sun Junliang
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201704573
Subject(s) - germanate , sorption , diffraction , materials science , crystallography , synchrotron , crystal structure , x ray crystallography , hydrothermal circulation , chemistry , chemical engineering , adsorption , optics , optoelectronics , physics , doping , engineering
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 Ge 7 and Ge 10 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 CO 2 sorption selectivity over N 2 and CH 4 at 298 K than at 273 K, making it a promising candidate for CO 2 separation.