Issue 12, 1991

Thermal decomposition of solid wegscheiderite, Na2CO3· 3NaHCO3

Abstract

The thermal decomposition of solid wegscheiderite, Na2CO3· 3NaHCO3, has been studied over the temperature range 350–465 K in atmospheres of pure nitrogen and pure carbon dioxide. At high temperatures, in both gases, the decomposition is controlled by a phase-boundary process having an activation energy of ca. 30 kJ mol–1. The frequency factor for this process is very low in both gases. At low temperatures, nucleation-and-growth processes control the decomposition; in nitrogen the reaction follows Avrami–Erofeyev kinetics with n= 2, with an activation energy of 64 kJ mol–1, while in carbon dioxide a first-order mechanism is rate-controlling, with an activation energy of 94 kJ mol–1. Electron micrographs are presented which generally support the suggested mechanisms. Comparisons are made with the decomposition of sodium hydrogencarbonate.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans., 1991,87, 1911-1914

Thermal decomposition of solid wegscheiderite, Na2CO3· 3NaHCO3

M. C. Ball, A. N. Strachan and R. M. Strachan, J. Chem. Soc., Faraday Trans., 1991, 87, 1911 DOI: 10.1039/FT9918701911

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