کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1333016 979063 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microwave-assisted reconstruction of Ni,Al hydrotalcite-like compounds
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Microwave-assisted reconstruction of Ni,Al hydrotalcite-like compounds
چکیده انگلیسی

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 NH3 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 Na2CO3 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 NH3 aqueous solution.

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 Na2CO3 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 NH3 aqueous solution.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 181, Issue 5, May 2008, Pages 987–996
نویسندگان
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