Preparation of activated carbons from corn cob catalyzed by potassium salts and subsequent gasification with CO2

Publication Type:

Journal Article


Bioresour Technol, Volume 78, Number 2, p.203-8 (2001)


0960-8524 (Print)

Accession Number:



Carbon Dioxide, Carbon/ isolation & purification, Carbonates, Charcoal/isolation & purification, Hydroxides, Potassium, Potassium Compounds, Surface Properties, Zea mays/ chemistry


In the present study, granular activated carbons were prepared from agricultural waste corn cob by chemical activation with potassium salts and/or physical activation with CO2. Under the experimental conditions investigated, potassium hydroxide (KOH) and potassium carbonate (K2CO3) were effective activating agents for chemical activation during a ramping period of 10 degrees C/min and subsequent gasification (i.e., physical activation) at a soaking period of 800 degrees C. Large BET surface areas (>1,600 m2/g) of activated carbons were thus obtained by the combined activation. In addition, this study clearly showed that the porosity created in the acid-unwashed carbon products is substantially lower than that of acid-washed carbon products due to potassium salts left in the pore structure.


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