Kinetics of thermal decomposition of some metal oxalates

Palanisamy, T. ; Gopalakrishnan, J. ; Viswanathan, B. ; Srinivasan, V. ; Sastri, M. V. C. (1971) Kinetics of thermal decomposition of some metal oxalates Thermochimica Acta, 2 (3). pp. 265-273. ISSN 0040-6031

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The thermal decomposition kinetics of oxalates of ZnII, NiII and ThIV have been studied in air by isothermal and non-isothermal thermogravimetry. The isothermal kinetic results suggest that the mechanism of decomposition of the zinc compound involves rapid nucleation followed by two dimensional growth in the acceleratory region, while in the case of thorium oxalate, the initial nucleation occurs by a chain mechanism on the surface of the reactant followed by the growth of the product from the surface towards the interior. The results on nickel oxalate could not be interpreted in an unambiguous manner. The activation energy and the frequency factor obtained from TG curves compare well with those obtained from the isothermal method. The activation energies for the dehydration of these oxalates have also been evaluated from the thermogravimetric curves.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:12729
Deposited On:11 Nov 2010 09:04
Last Modified:16 May 2016 22:00

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