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  4. The effect of the carbonization/activation procedure on the microporous texture of the subsequent chars and active carbons
 
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The effect of the carbonization/activation procedure on the microporous texture of the subsequent chars and active carbons

Auteur(s)
Cagnon, Benoît
Py, Xavier
Guillot, André
Stoeckli, Fritz 
Institut de physique 
Date de parution
2003
In
Microporous and Mesoporous Materials, Elsevier, 2003/57/3/273-282
Mots-clés
  • chars
  • carbonization
  • temperature
  • activated carbons
  • adsorption
  • chars

  • carbonization

  • temperature

  • activated carbons

  • adsorption

Résumé
Chars obtained by carbonizing coconut shells at different intermediate heat treatment temperatures (IHTT) between 400 and 800 °C were activated at 800 °C in a stream of N<sub>2</sub>+H<sub>2</sub>O, following two distinct procedures. In the first procedure, activation follows directly the carbonization, whereas in the second procedure, the sample was first brought back to 25 °C and subsequently heated again to the activation temperature of 800 °C. The data for CO<sub>2</sub> adsorption at 25 °C and N<sub>2</sub> at −196 °C with immersion calorimetry confirms that the activated carbons derived from chars obtained at low IHTT and in two steps, present a “gate effect” for burn-offs <20% or 25%, otherwise, the final carbons present similar structural characteristics for higher burn-offs. It also appears that the evolution of the average pore width <i>L</i><sub>0</sub> with the micropore volume <i>W</i><sub>0</sub> follows a general pattern outlined early.
Identifiants
https://libra.unine.ch/handle/123456789/16887
_
10.1016/S1387-1811(02)00597-8
Type de publication
journal article
Dossier(s) à télécharger
 main article: Cagnon_Beno_t_-_The_effect_of_the_carbonization_activation_20080414.pdf (343.59 KB)
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