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Título: | On the porous silicate HPM-5 |
Autor: | Jo, Donghui; Mayoral, Álvaro CSIC ORCID; Hong, Suk Bong; Camblor, Miguel Ángel CSIC ORCID | Palabras clave: | Zeolites Silicates Microporous materials Nanostructures Zeolite analogues |
Fecha de publicación: | 18-may-2017 | Editor: | John Wiley & Sons | Citación: | European Journal of Inorganic Chemistry 2017(19): 2525-2531 (2017) | Resumen: | 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 Si MAS NMR spectroscopy. H MAS NMR spectroscopy confirmed the existence of highly deshielded protons (δ = –11.6 ppm) assigned to hydrogen atoms in relatively strong Si–O–H···O–Si hydrogen bonds (O···O distance ≈ 2.64 Å) The calcined material shows limited microporosity (0.07–0.09 cm g). 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. | Versión del editor: | https://doi.org/10.1002/ejic.201700023 | URI: | http://hdl.handle.net/10261/188348 | DOI: | 10.1002/ejic.201700023 | Identificadores: | doi: 10.1002/ejic.201700023 e-issn: 1099-0682 1434-1948 |
Aparece en las colecciones: | (ICMM) Artículos |
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