Preparation of modified active carbon from brown coal by ammoxidation

The technology of obtaining active carbon enriched in nitrogen from brown coal is described. The effect of ammoxidation by a mixture of ammonia and air at the ratio 1:3 at 300 and 350 °C, at each stage of the active carbon production has been tested. The amount of nitrogen introduced into the active...

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Bibliographic Details
Published in:Fuel processing technology 2007-04, Vol.88 (4), p.409-415
Main Authors: Pietrzak, R., Wachowska, H., Nowicki, P., Babeł, K.
Format: Article
Language:English
Subjects:
Activated carbon
Activation
Ammoxidation
Applied sciences
BET surface area
Brown coal
Chemical structure
Energy
Exact sciences and technology
Fuels
Processing
Wood. Peat. Brown coal
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Summary:The technology of obtaining active carbon enriched in nitrogen from brown coal is described. The effect of ammoxidation by a mixture of ammonia and air at the ratio 1:3 at 300 and 350 °C, at each stage of the active carbon production has been tested. The amount of nitrogen introduced into the active carbon has been proved to depend on the stage at which ammoxidation was performed. Carbonisation and activation with steam of the samples enriched in nitrogen have been found to lead to a significant decrease in its content and to cause an increase in the stability of the nitrogen groups. The ammoxidation of the active carbon has decreased their surface area, while the ammoxidation and high temperature of activation favour the formation of surface oxide groups of basic character.
ISSN:0378-3820
1873-7188
DOI:10.1016/j.fuproc.2006.11.001