On the Porous Silicate HPM-5
SCIE
SCOPUS
- Title
- On the Porous Silicate HPM-5
- Authors
- Jo, Donghui; Mayoral, Alavro; Hong, Suk Bong; Camblor, Miguel A.
- Date Issued
- 2017-03
- Publisher
- WILEY-V C H VERLAG GMBH
- Abstract
- HPM-5, a porous aluminosilicate with an intricate and so far unsolved structure, has been synthesized by using 1,2,3-trimethylimidazolium in hydroxide medium in the absence of fluoride anions. It consistently displays an ill-defined XRD pattern with broad and overlapped reflections and contains a large concentration of defects, as evidenced by IR and 29Si MAS NMR spectroscopy. 1H MAS NMR spectroscopy confirmed the existence of highly deshielded protons (delta = -11.6 ppm) assigned to hydrogen atoms in relatively strong Si-O-H---O-Si hydrogen bonds (O---O distance = 2.64 A) The calcined material shows limited microporosity (0.07-0.09 cm3 g-1). The results of a high-resolution transmission electron microscopy study suggest HPM-5 may be far more complicated than "standard" layered zeolites and may consist of low-density layers profusely decorated by holes. The resulting lace-like layers may be too unstable to withstand reactions characteristic of more conventional layered materials (both delamination and expansion by silylation); although the derivatives show an increase in the specific surface area, the layers are apparently disassembled and, at most, only ribbons remain.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50518
- DOI
- 10.1002/ejic.201700023
- ISSN
- 1434-1948
- Article Type
- Article
- Citation
- EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, vol. 2017, no. 19, page. 2525 - 2531, 2017-03
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