Open AccessCharacterization of Cornstalk and Bituminous Coal Based on Kinetic and Thermodynamic Parameter for Co-pyrolysis
Author(s) -
Yuyuan He,
Yang Qu,
Qiong Liu,
Pan Li,
Shuqi Fang,
Junying Chen,
Chun Chang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/555/1/012001
Subject(s) - pyrolysis , thermogravimetric analysis , enthalpy , kinetic energy , thermodynamics , activation energy , gibbs free energy , coal , raw material , materials science , chemistry , organic chemistry , physics , quantum mechanics
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 (m BC /m RC =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 (Δ H ) 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 (Δ G ) 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 (Δ S ) loss.