Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 3709 - 3716 (1986)
Update date:2022-08-11
Topics:
Ball, Matthew C.
Snelling, Christine M.
Strachan, Alec N.
Strachan, Rebecca M.
The thermal decomposition of solid sodium bicarbonate has been studied in the temperature range 360-500 K over a range of partial pressures of carbon dioxide.The effect of water vapour has also been studied.Above 440 K the reaction follows contracting-cube kinetics with an activation energy of 32 kJ mol-1 and a frequency factor of 101 s-1.In this temperature range the presence of water or carbon dioxide has little effect on the kinetics.Below 390 K the reaction follows first-order kinetics.In nitrogen, the activation energy is ca. 64 kJ mol-1, the frequency factor is 105 s-1 and water vapour has little effect.High partial pressures of carbon dioxide increase the activation energy to ca. 130 kJ mol-1 and the frequency factor to 1013.5 s-1.The results of microscopic examination generally confirm the kinetics but show that at low temperatures in nitrogen and carbon dioxide the process are different in detail.
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