The intrinsic kinetics of the thermal decomposition of NaHCO3 to Na2CO3 has been studied by non-isothermal thermogravimetric analysis. NaHCO3 powder of 47 μm mean particle size was heated to decomposition at three constant heating rates (1.25, 2.5, and 5° C min-1) in flowing nitrogen. The range in which the decomposition occurred was about 360-450 K. A graphical method and Friedman's method were both used to analyze the experimental data: close agreement was obtained. The reaction rate showed a first-order dependence on the amount of unreacted NaHCO3 and the values for the activation energy and pre-exponential factor were 25.3 kcal mol-1 (105.8 kJmol-1) and 6.7 × 1012 min-1, re- spectively.
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