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Preparation and Characterization of KOH-Activated Carbons Developed from Petroleum Coke

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2009, 10(4), pp.293-299
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General

S. A. Sayed Ahmed 1 Reham M. M. Abo El-enin 1 Th. El-Nabarawy 1

1National Research Centre

Candidate

ABSTRACT

Potassium hydroxide activated carbons were prepared from Egyptian petroleum cokes with different KOH/coke ratios and at different activation temperatures and times. The textural properties were determined by adsorption of nitrogen at −196oC. The adsorption of iodine and methylene blue was also investigated at 30oC. The surface area and the non-micropore volume increased whereas the micropore volume decreased with the increase of the ratio KOH/coke. Also the surface area and porosity increased with the rise of activation temperature from 500 to 800oC. Textural parameter considerably increased with the increase of activation time from 1 to 3 h. Further increasing of activation time from 3 to 4 h was associated with a less pronounced increase in textural parameters. The adsorption of iodine shows the same trend of surface area and porosity change exhibited by nitrogen adsorption, with KOH/coke ratio and temperature of activation. Adsorption of methylene blue follows pseudo-first-order kinetics and its equilibrium adsorption follows Langmuir and D-R models.

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