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Control of the spatial homogeneity of pore surface chemistry in particulate activated carbon

journal contribution
posted on 15.01.2016, 09:18 by Saeid Sedghi, S. Hadi Madani, Cheng Hu, Ana Silvestre-Albero, William Skinner, Philip Kwong, Phillip Pendleton, Ronald J. Smernik, Francisco Rodriguez-Reinoso, Mark Biggs
We show here that a physical activation process that is diffusion-controlled yields an activated carbon whose chemistry – both elemental and functional – varies radially through the particles. For the ∼100 μm particles considered here, diffusion-controlled activation in CO2 at 800 °C saw a halving in the oxygen concentration from the particle periphery to its center. It was also observed that this activation process leads to an increase in keto and quinone groups from the particle periphery towards the center and the inverse for other carbonyls as well as ether and hydroxyl groups, suggesting the two are formed under CO2-poor and -rich environments, respectively. In contrast to these observations, use of physical activation processes where diffusion-control is absent are shown to yield carbons whose chemistry is radially invariant. This suggests that a non-diffusion limited activation processes should be used if the performance of a carbon is dependent on having a specific optimal pore surface chemical composition.

History

School

  • Science

Department

  • Chemistry

Published in

CARBON

Volume

95

Pages

144 - 149 (6)

Citation

SEDGHI, S. ...et al., 2015. Control of the spatial homogeneity of pore surface chemistry in particulate activated carbon. Carbon, 95, pp. 144-149.

Publisher

© Elsevier

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

This paper is in closed access.

ISSN

0008-6223

Language

en

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