Abstract
The effect of pre-oxidation on the porosity evolution in heavy-oil fly ash subjected to activation with CO 2 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 CO 2 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 m 2/g at a 40% burn-off).
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