Preparation of nitrogen-doped porous carbon by ammonia gas treatment and the effects of N-doping on water adsorption

Horikawa, Toshihide, Sakao, Noriyuki, Sekida, Tomoki, Hayashi, Jun’ichi, Do, D.D. and Katoh, Masahiro (2012) Preparation of nitrogen-doped porous carbon by ammonia gas treatment and the effects of N-doping on water adsorption. Carbon, 50 5: 1833-1842. doi:10.1016/j.carbon.2011.12.033


Author Horikawa, Toshihide
Sakao, Noriyuki
Sekida, Tomoki
Hayashi, Jun’ichi
Do, D.D.
Katoh, Masahiro
Title Preparation of nitrogen-doped porous carbon by ammonia gas treatment and the effects of N-doping on water adsorption
Journal name Carbon   Check publisher's open access policy
ISSN 0008-6223
1873-3891
Publication date 2012-04-01
Sub-type Article (original research)
DOI 10.1016/j.carbon.2011.12.033
Volume 50
Issue 5
Start page 1833
End page 1842
Total pages 10
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2013
Language eng
Formatted abstract
Nitrogen-doped porous carbons (N-RFCC) were prepared by NH 3N 2 mixture gas treatment at high temperature during the carbonization process on resorcinol-formaldehyde cryogels. To show the role of N-doping on the adsorption behavior we carried out water adsorption, and it was found that the amount of water adsorbed is directly related to the nitrogen content over the low pressure region (P/P 0 < 0.3). Applying the theoretical water adsorption model, Horikawa-Do (HD) model, to the adsorption isotherms of N-RFCCs, we could analyze the effects of nitrogen-doping on the adsorption mechanism. Although the concentration of functional groups of N-RFCC is almost equal to that of the non-doped RFCC, which was measured by Boehm titration method, the water adsorbed amounts of N-RFCCs over the low pressure region were larger. This is due to part of the doped nitrogen atoms act as functional groups, contributing to the total concentration of functional groups. The saturated concentrations depend on the packing fraction of water molecules, which in turn depends on the pore size. The packing fractions of N-RFCCs are larger than those of RFCCs, and this could be attributed to the high affinity between water clusters and N-doped surfaces, resulting in a reduced hydrophobicity of the surface.
Keyword Oxidized Carbon-Fibers
Bpl Activated Carbon
Coal-Tar Pitch
Surface-Chemistry
Catalytic-Activity
Pyrolysis
Mechanism
Coadsorption
Formaldehyde
Precursors
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 23 December 2011.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2013 Collection
 
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