Thermogravimetric Analysis and Chemical Kinetic for Regeneration of Sodium Carbonate Solid Sorbent

In this study, non-isothermal kinetic methods for the decomposition of the adsorbed CO₂ on pure sodium hydrogen carbonate (NaHCO₃) were investigated by a thermogravimetric analysis (TG) and differential thermogravimetry (DTG). Four different heating rates were measured to calculate the order of reaction (n), the pre-exponential factor (A) and activation energy (E_a) using three different models: Kissinger-Akahira-Sunose Method (KAS), Flynn-Wall-Ozawa (FWO) and analytical method. The results showed that KAS and FWO methods gave similar values due to the approximation of employed equation whereas the analytical method gave different values. The obtained parameters from those three methods then were used to calculate the chemical reaction conversion versus temperature and their R². The results showed that analytical method provided the most accurate results comparing with KAS and FWO methods.

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