The thermal decomposition of (NH4)[VO(O2)2(NH3)] |
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Authors: | C A Strydom D de Waal |
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Institution: | (1) Department of Chemistry, University of Pretoria, 0002 Pretoria, South Africa |
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Abstract: | The compound, (NH4)VO(O2)2(NH3)], thermally decomposes to ammonium metavanadate, which then decomposes to vanadium pentoxide. Using a heating rate of 5 deg·min–1, the first decomposition step occurs between 74° and 102°C. The transformation degree dependence of the activation energy (-E) is shown to follow a decreasing convex form, indicating that the first decomposition step is a complex reaction with a change in the limiting stage of the reaction. Infrared spectra indicated that the decomposition proceeds via the gradual reduction of the ratio of the (NH4)2O to V2O5 units from the original 11 ratio in ammonium metavanadate, which may be written as (NH4)2O·V2O5, to V2O5.The assistance of Professor A. M. Heyns (University of Pretoria) and Professor K. L. Range (University of Regensburg) is gratefully acknowledged as well as the financial assistance of the University of Pretoria and the FRD. |
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Keywords: | kinetic investigations (NH4)[VO(O2)2(NH3)] |
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