title: Preparation of activated carbons from corn cob catalyzed by potassium salts and subsequent gasification with CO2.
abstract: 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.
authors.affiliation: Department of Environmental Engineering and Health, Chia Nan College of Pharmacy and Science, Taiwan, ROC. wwtsai@mail.chna.edu.tw
authors.forename: W T
authors.initials: WT
authors.lastname: Tsai
authors.forename: C Y
authors.initials: CY
authors.lastname: Chang
authors.forename: S Y
authors.initials: SY
authors.lastname: Wang
authors.forename: C F
authors.initials: CF
authors.lastname: Chang
authors.forename: S F
authors.initials: SF
authors.lastname: Chien
authors.forename: H F
authors.initials: HF
authors.lastname: Sun
mesh_terms: D002244:Carbon / Q000302:isolation & purification*; D002245:Carbon Dioxide; D002254:Carbonates; D002606:Charcoal / Q000302:isolation & purification; D006878:Hydroxides; D011188:Potassium; D017680:Potassium Compounds; D013499:Surface Properties; D003313:Zea mays / Q000737:chemistry*
chemical_list: D002254:Carbonates; D006878:Hydroxides; D017680:Potassium Compounds; D002245:Carbon Dioxide; D002606:Charcoal; D002244:Carbon; C037593:potassium carbonate; D011188:Potassium; C029943:potassium hydroxide