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Abstract
The pyrolysis characteristic of bituminous coal (BC) and raw cornstalk (RC) were investigated through thermogravimetric analysis from environment temperature to 900 °C with 5, 15 and 25 °C/min. The distributed activation energy model (DAEM) was applied to estimate the kinetic parameters of samples. The average activation energy (E a) of BC, RC and the blended sample (mBC/mRC=6/4) were 304.56, 207.77 and 226.26 kJ/mol, respectively. The heat energies of the experiment to be needed was lower than that of calculation during co-pyrolysis, comparing with the theoretical calculation E a. To further researcher the thermal behavior during co-pyrolysis, the closeness of change in Enthalpy (ΔH) values vs. E a values for the blend indicated that activated complex formation may be favored because of lower potential energy barrier. Moreover, Gibbs free energy (ΔG) for the blend varied from 108.40 to 275.93 kJ/mol, the pyrolysis process was converted to disordered-state from ordered-state, considering the changes of Entropies (ΔS) loss.
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Details
1 Department of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang, Henan, China
2 School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan, China; Henan Center for Outstanding Overseas Scientists, Zhengzhou, Henan, China