期刊
ENERGY
卷 115, 期 -, 页码 931-941出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2016.09.033
关键词
Oil shale; Pyrolysis; Multistep kinetics; Thermal analysis; Mathematical deconvolution
资金
- research Grant of University of Mohammed V, Rabat (Morocco) [SCH04/09]
- Hassan II Academy of Science and Technology, Rabat (Morocco)
The kinetic analysis of the complex process of Moroccan Rif oil shale pyrolysis was studied in detail by thermogravimetric (TG) analysis and its derivative (DTG) under non-isothermal conditions. The investigated pyrolysis region, located between 325 and 600 degrees C, is formed by partially overlapping peaks and it was successfully separated into three discrete processes using the mathematical Fraser-Suzuki algorithm that accommodates asymmetric functions. For each separated process, the isoconversional differential and integral Model Free methods were used to evaluate activation energy and two Master plots fitting methods were explored to get reliable kinetic models. The main pyrolysis step of Moroccan Rif oil shale involves the devolatilization of organic matter including bitumen and kerogen respectively and subsequent decomposition of pyrite mineral FeS2. The first process represents the principal pyrolysis kinetic in accordance with dominance of bitumen products in the studied oil shale. By applying the nonlinear least square analysis to kinetic data, it was found that all processes were well described by n-th order kinetic equations, with n approximate to 1, for the first and third processes and n approximate to 1.67 for the second process. Besides, the thermodynamic functions of activated complexes (Delta S*, Delta H* and Delta G*) for the pyrolysis step of studied oil shale were calculated and discussed. (C) 2016 Elsevier Ltd. All rights reserved.
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