Journal of the Chemical Society - Faraday Transactions p. 631 - 636 (1992)
Update date:2022-08-29
Topics:
Ball, Matthew C.
Snelling, Christine M.
Strachan, Alec N.
Strachan, Rebecca M.
The thermal decomposition of solid sodium sesquicarbonate has been studied at temperatures between 350 and 487 K in nitrogen and carbon dioxide atmospheres.In nitrogen, a single-stage decomposition to sodium carbonate occurs, following Avrami-Erofeyev kinetics (n = 2), with an inflexion at ca. 390 K.The activation energies are 24 kJ mol-1 for the high-temperature region and 58 kJ mol-1 for the low-temperature region.In carbon dioxide above 435 K, the single-stage reaction follows contracting disc kinetics with an activation energy of 29 kJ mol-1.In carbon dioxide at low temperatures, wegscheiderite (Na2CO3*3NaHCO3) and sodium carbonate monohydrate (Na2CO3*H2O) are formed, and this reaction follows first-order kinetics, withb an activation energy of 67 kJ mol-1.Microscopic evidence is also presented.Relationships between the decomposition of sesquicarbonate and other related compounds are discussed.
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