Intrinsic kinetics of the thermal decomposition of sodium bicarbonate

Yee Lin Wu, Shin Min Shih

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19 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)177-186
Number of pages10
JournalThermochimica Acta
Issue numberC
Publication statusPublished - 1993 Aug 28

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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