The effect of pre-oxidation on the porosity evolution in heavy-oil fly ash subjected to activation with CO2 has been investigated. After preliminary acid leaching, used to reduce the mineral matter content, the leached fly ash has been oxidised in air at 250 °C for 36 h. Pyrolysis was conducted on the unoxidised and oxidised leached fly ash at 900 °C for 2 h and the resultant chars were activated with CO2 at 900 °C for different times. The activated samples have been characterised as regards the surface area and the pore volume. The pre-oxidation enhances the porosity development mainly in terms of mesoporosity leading to obtain activated products with higher surface area (about 270 m2/g at a 40% burn-off).
Effect of pre-oxidation on the porosity development in a heavy oil fly ash by CO2 activation
SEGGIANI, MAURIZIA;VITOLO, SANDRA;
2005-01-01
Abstract
The effect of pre-oxidation on the porosity evolution in heavy-oil fly ash subjected to activation with CO2 has been investigated. After preliminary acid leaching, used to reduce the mineral matter content, the leached fly ash has been oxidised in air at 250 °C for 36 h. Pyrolysis was conducted on the unoxidised and oxidised leached fly ash at 900 °C for 2 h and the resultant chars were activated with CO2 at 900 °C for different times. The activated samples have been characterised as regards the surface area and the pore volume. The pre-oxidation enhances the porosity development mainly in terms of mesoporosity leading to obtain activated products with higher surface area (about 270 m2/g at a 40% burn-off).File | Dimensione | Formato | |
---|---|---|---|
60/92471363136573039926886941474445944562
solo utenti autorizzati
Tipologia:
Versione finale editoriale
Licenza:
NON PUBBLICO - Accesso privato/ristretto
Dimensione
251.88 kB
Formato
Unknown
|
251.88 kB | Unknown | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.