Al-Mn-silicate nanobubbles phase as an intermediate in zeolite formation
| Autor: | Latifa Bergaoui, Amal Bejar, Jean-François Lambert, Semy Ben Chaabene, Maguy Jaber |
|---|---|
| Přispěvatelé: | Université de Tunis El Manar (UTM), Laboratoire d'Archéologie Moléculaire et Structurale (LAMS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Réactivité de Surface (LRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Analcime
Inorganic chemistry 020101 civil engineering 02 engineering and technology engineering.material 0201 civil engineering law.invention chemistry.chemical_compound Nanobubble X-ray photoelectron spectroscopy Geochemistry and Petrology law Kaolinite [CHIM]Chemical Sciences Lamellar structure Silicic acid Crystallization Zeolite Manganese silicate Geology 021001 nanoscience & nanotechnology Silicate Clay minerals chemistry engineering 0210 nano-technology |
| Zdroj: | Applied Clay Science Applied Clay Science, 2016, 123, pp.202-209. ⟨10.1016/j.clay.2016.01.025⟩ Applied Clay Science, Elsevier, 2016, 123, pp.202-209. ⟨10.1016/j.clay.2016.01.025⟩ |
| ISSN: | 0169-1317 |
| DOI: | 10.1016/j.clay.2016.01.025⟩ |
| Popis: | International audience; Manganese (II) carbonate, silicic acid and aluminum nitrate were treated hydrothermally at different temperatures (120–210°C) and for different durations (6–72 h) in an aqueous basic medium. Different compositions of starting mixtures were used. The synthetized materials were characterized by powder X-ray diffraction, FTIR-spectroscopy, N2 adsorption analysis, Transmission Electron Microscopy (TEM), energy dispersive X-ray analysis (EDX), thermal analysis (TG-DTG), Temperature-programmed reduction (TPR), X-fluorescence, X-ray photoelectron spectroscopy (XPS), electronic paramagnetic resonance (EPR) and 29Si and 27Al MAS-NMR spectroscopy. The formation of kaolinite, smectite-like and Mn-containing lamellar phases was observed, but only in minor amounts contrary to previous studies. The majority phase was an original Al–Mn silicate with nanobubble-like morphology, a high surface area and mesoporosity, containing both Mn(IV) in lattice positions and Mn2 + as exchangeable cations. This amorphous Al–Mn-silicate nanobubbles phase seems to be an intermediate in a zeolite formation. Indeed, the increase of the reaction temperature, the reaction time or the reagent concentrations promoted the crystallization of a zeolite of the analcime type by transformation of the Al–Mn-silicate nanobubbles. |
| Databáze: | OpenAIRE |
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