Kinetic study of wood chips decomposition by TGA
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Lukáš Gašparovič
,
Zuzana Koreňová
Abstract
Pyrolysis of a wood chips mixture and main wood compounds such as hemicellulose, cellulose and lignin was investigated by thermogravimetry. The investigation was carried out in inert nitrogen atmosphere with temperatures ranging from 20°C to 900°C for four heating rates: 2 K min−1, 5 K min−1, 10 K min−1, and 15 K min−1. Hemicellulose, cellulose, and lignin were used as the main compounds of biomass. TGA and DTG temperature dependencies were evaluated. Decomposition processes proceed in three main stages: water evaporation, and active and passive pyrolysis. The decomposition of hemicellulose and cellulose takes place in the temperature range of 200–380°C and 250–380°C, while lignin decomposition seems to be ranging from 180°C up to 900°C. The isoconversional method was used to determine kinetic parameters such as activation energy and pre-exponential factor mainly in the stage of active pyrolysis and partially in the passive stage. It was found that, at the end of the decomposition process, the value of activation energy decreases. Reaction order does not have a significant influence on the process because of the high value of the pre-exponential factor. Obtained kinetic parameters were used to calculate simulated decompositions at different heating rates. Experimental data compared with the simulation ones were in good accordance at all heating rates. From the pyrolysis of hemicellulose, cellulose, and lignin it is clear that the decomposition process of wood is dependent on the composition and concentration of the main compounds.
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© 2009 Institute of Chemistry, Slovak Academy of Sciences
Articles in the same Issue
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- Comparison of anoxic granulation in USB reactors with various inocula
- A study of selected phytoestrogens retention by reverse osmosis and nanofiltration membranes - the role of fouling and scaling
- Displacement washing of kraft pulp cooked from a blend of hardwoods
- Solid suspension and gas dispersion in gas-solid-liquid agitated systems
- Implementation of marginal quantities in management of cogeneration units operating in liberal market environment
- Kinetic study of wood chips decomposition by TGA
- LES and URANS modelling of turbulent liquid-liquid flow in a static mixer: Turbulent kinetic energy and turbulence dissipation rate
- Steady state and dynamic simulation of a hybrid reactive separation process
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- Development of β and α isotactic polypropylene polymorphs in injection molded structural foams
- Effect of time on the metal-support (Fe-MgO) interaction in CVD synthesis of single-walled carbon nanotubes
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Articles in the same Issue
- Co-digestion of agricultural and industrial wastes
- Comparison of anoxic granulation in USB reactors with various inocula
- A study of selected phytoestrogens retention by reverse osmosis and nanofiltration membranes - the role of fouling and scaling
- Displacement washing of kraft pulp cooked from a blend of hardwoods
- Solid suspension and gas dispersion in gas-solid-liquid agitated systems
- Implementation of marginal quantities in management of cogeneration units operating in liberal market environment
- Kinetic study of wood chips decomposition by TGA
- LES and URANS modelling of turbulent liquid-liquid flow in a static mixer: Turbulent kinetic energy and turbulence dissipation rate
- Steady state and dynamic simulation of a hybrid reactive separation process
- Prediction of liquid-liquid flow in an SMX static mixer using large eddy simulations
- Simulation of a hybrid fermentation-separation process for production of butyric acid
- Simulation of aerobic landfill in laboratory scale lysimeters — effect of aeration rate
- Application of anoxic fixed film and aerobic CSTR bioreactor in treatment of nanofiltration concentrate of real textile wastewater
- Pretreatment of landfill leachate by chemical oxidation processes
- Development of β and α isotactic polypropylene polymorphs in injection molded structural foams
- Effect of time on the metal-support (Fe-MgO) interaction in CVD synthesis of single-walled carbon nanotubes
- Unique role of water content in enzymatic synthesis of ethyl lactate using ionic liquid as solvent
- Autothermal biodrying of municipal solid waste with high moisture content
- Kinetics of nitric oxide oxidation
