Kinetics of sodium bicarbonate decomposition

Hu, W
Smith , JM
Doğu, Timur
Doğu, Gülşen
A thermal gravimetric method was used to measure rates of decomposition of NAHCO3 particles. Such decomposition produces a highly porous Na2Co3 that reacts with SO2 rapidly and completely at moderate temperatures. Hence, NaHCO3 decomposition provides a reactant with attractive features for SO2 removal. The rapid rate of decomposition combined with the high heat effect prevented determining intrinsic rates by constant temperature runs when the temperature level was above 400 K. However, rising‐temperature runs, which allowed time for heat transfer to equilibrate temperatures of the thermocouple and particles, gave reliable results at high temperatures. The activation energy was 102 kJ/mol. Porosimeter data verified the large increase in pore volume (from 0.03 to 0.39 × 10−3 m3/kg) on converting the NaHCO3 particles to Na2CO3. First‐order kinetics were observed up to high conversions, after which the apparent order decreased. However, the sodium bicarbonate could be completely converted to Na2CO3

Citation Formats
W. Hu, J. Smith, T. Doğu, and G. Doğu, “Kinetics of sodium bicarbonate decomposition,” AIChE Journal, vol. 32, no. 9, pp. 1483–1490, 1986, Accessed: 00, 2020. [Online]. Available: