Synthesis and characterization of calcium–alumino-silicate hydrates from oil shale ash – Towards industrial applications
The influence of the alkaline medium on the hydrothermal activation of the oil shale fly ash with NaOH and KOH was studied using SEM/EDX, XRD, 29Si and 27Al high-resolution MAS-NMR spectra. In the presence of NaOH the silicon in the original fly ash was completely converted into calcium–aluminum–sil...
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| Veröffentlicht in: | Fuel (Guildford) 2008-08, Vol.87 (10-11), p.1998-2003 |
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| container_end_page | 2003 |
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| container_issue | 10-11 |
| container_start_page | 1998 |
| container_title | Fuel (Guildford) |
| container_volume | 87 |
| creator | Reinik, Janek Heinmaa, Ivo Mikkola, Jyri-Pekka Kirso, Uuve |
| description | The influence of the alkaline medium on the hydrothermal activation of the oil shale fly ash with NaOH and KOH was studied using SEM/EDX, XRD, 29Si and 27Al high-resolution MAS-NMR spectra. In the presence of NaOH the silicon in the original fly ash was completely converted into calcium–aluminum–silicate–hydrates, mainly into 1.1nm tobermorite structure during 24-h treatment at 160°C. At similar reaction conditions, the activation with KOH resulted only to the formation of amorphous calcium–silica-hydrate gel on the surface of ash particles at temperature. The results obtained in this study indicate that the oil shale fly ash can be used for production of Al-substituted tobermorites when strongly alkaline media (NaOH) is applied. The synthesized product was used in a catalytic d-lactose isomerization reaction. |
| doi_str_mv | 10.1016/j.fuel.2007.11.008 |
| format | Article |
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| ispartof | Fuel (Guildford), 2008-08, Vol.87 (10-11), p.1998-2003 |
| issn | 0016-2361 1873-7153 |
| language | eng |
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| source | Access via ScienceDirect (Elsevier) |
| subjects | Applied sciences Catalysis Energy Energy. Thermal use of fuels Exact sciences and technology Installations for energy generation and conversion: thermal and electrical energy Oil shale fly ash Thermal power plants Tobermorite synthesis |
| title | Synthesis and characterization of calcium–alumino-silicate hydrates from oil shale ash – Towards industrial applications |
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