Mathematical modelling and kinetics of thermal decomposition of corn stover using thermogravimetry (TGA-DTG) technique
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Description
Lignocellulosic biomass could be pyrolytically converted into value-added
products and one of the steps during the pyrolysis is thermal decomposition
which involves multiple reactions. Therefore, mathematical modelling of
thermal decomposition could provide molecular insight into thermal
degradation reactions by providing accurate prediction of the phases of the
multi-component reactions in particular nucleation, growth and boundaryphase
reactions occurring under different working conditions. In this study,
thermal decomposition behaviour of Corn Stover was explored using
thermogravimetry technique (TGA-DTG) at heating rates of 20, 30, 40 and
50 °C/min under nitrogen gas flow (55 mL/min) and oxygen gas flow at 15 mL/min. The Flynn-Wall Ozawa (FWO) and Kissinger Akahira Sunose
(KAS) models were used to estimate the kinetic parameters such as apparent
activation energy, pre-exponential factor and order of reaction so as to be
able to design the pyrolytic reactor that could be used for the biomass
conversion. The hemicellulose maximum mass loss rate was at 300 °C,
cellulose at 410 °C and lignin decomposition from 190 °C to 620 °C. The
apparent activation energies calculated ranged from 44.39 -134.81 kJ/mol
using the FWO method while the KAS method gave 87.83 - 282.41 kJ/mol.
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TP Chemical technology