Microwave-assisted reconstruction of Ni,Al hydrotalcite-like compounds
- Departamento de Quimica Inorganica, Universidad de Salamanca, 37008 Salamanca (Spain)
The microwave-assisted reconstruction of Ni,Al hydrotalcite-like compounds (HTlcs) with Ni/Al molar ratios 2/1 and 3/1 has been studied. Mixed oxides obtained after calcination of the HTlcs are immersed in three different solutions containing carbonate, distilled water and an aqueous NH{sub 3} solution, and then heated at different temperatures for increasing periods of time under microwave radiation. The evolution of the structure during the treatment is followed by powder X-ray diffraction, FT-IR and vis-UV spectroscopies and SEM and TEM microscopies. Full recovery of the original layered structure is achieved in short periods of time for the 2/1 samples when the calcined HTlcs are rehydrated in the Na{sub 2}CO{sub 3} solution, but more drastic conditions are necessary for the 3/1 samples and the reconstruction seems not to be complete. Finally, only a partial reconstruction is observed in distilled water or NH{sub 3} aqueous solution. - Graphical abstract: The microwave-assisted reconstruction of Ni,Al HTlcs with Ni/Al molar ratios 2/1 and 3/1 has been studied. Full recovering of the original layered structure is achieved in short periods of time for the 2/1 in the Na{sub 2}CO{sub 3} solution, but more drastic conditions are necessary for the 3/1 samples and the reconstruction seems not to be completed. Only a partial reconstruction is observed in distilled water or NH{sub 3} aqueous solution.
- OSTI ID:
- 21128274
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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