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Kinetics of thermal degradation of wood biomass
Pyrolysis kinetics of a hardwood representative, beech ( Fagus sylvatica ), was investigated by two different kinetic approaches: model-free isoconversional method and model-fitting method. The model-free isoconversional method was used for the determination of apparent kinetic parameters, i.e. the...
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Published in: | Chemical papers 2014, Vol.68 (12), p.1725-1738 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Pyrolysis kinetics of a hardwood representative, beech (
Fagus sylvatica
), was investigated by two different kinetic approaches: model-free isoconversional method and model-fitting method. The model-free isoconversional method was used for the determination of apparent kinetic parameters, i.e. the activation energy and pre-exponential factor. The model fitting method was used for the optimization of kinetic parameters of the reaction pathways of three selected reaction mechanisms: one-step, two-step, and three-step one. In both approaches, thermo-gravimetric data were used at five heating rates: 2°C min
−1
, 5°C min
−1
, 10°C min
−1
, 15°C min
−1
and 20°C min
−1
. As the most suitable mechanism, the three-step mechanism containing the intermediate degradation step was chosen. This selection was supported by experimental results from the
13
C NMR analysis of solid residues prepared at the key temperatures within the range of 230–500°C. The progress of mass fraction values of each component in this mechanism was simulated. Conclusions from the simulation were confronted with experimental results from the
13
C NMR. |
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ISSN: | 0366-6352 1336-9075 |
DOI: | 10.2478/s11696-014-0622-y |