Synthesis of mesoporous alumina microfibres by ammonium carbonate precipitation
| Autor: | Y X Chen, L T Sun, L W Bi, Z D Zhao, Peng Wang, Liqun Zhang |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Ammonium carbonate
Materials science Mechanical Engineering Inorganic chemistry Condensed Matter Physics Aluminium nitrate law.invention chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Aluminium carbonate law Hydroxide General Materials Science Ammonium Calcination Mesoporous material Gibbsite |
| Zdroj: | Materials Research Innovations. 16:121-125 |
| ISSN: | 1433-075X 1432-8917 |
| DOI: | 10.1179/1433075x11y.0000000033 |
| Popis: | Mesoporous alumina microfibres were successfully synthesised through a facile ammonium carbonate precipitation route. X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectrometry, thermal gravimetry–differential scanning calorimetry, N2 adsorption and desorption as well as transmission electron microscopy were used to characterise the samples. It was observed that the phases of the samples transformed from gibbsite into ammonium aluminium carbonate hydroxide with an increase in aging time from 0 to 18 h, while the molar ratio of ammonium carbonate to aluminium nitrate nonahydrate was 3. At the same time, well dispersed ammonium aluminium carbonate hydroxide microfibres with a layer by layer packing structure were obtained. The fibrous morphology was maintained after the calcination. The calcined alumina microfibres possessed wormhole-like mesopores with a pore diameter of ∼4 nm. The Brunauer–Emmett–Teller surface area of the alumina microfibres was 298·7 m2 g−1, and the... |
| Databáze: | OpenAIRE |
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