Add time:07/23/2019 Source:sciencedirect.com
The thermal decomposition of Ammonium paratungstate (cas 11120-25-5) tetrahydrate has been studied in oxidising atmosphere at four heating rates employing the analytical techniques TG, DTG, DSC, and MS. In total, three endothermic and two exothermic effects have been detected. From the combined thermal and kinetic analysis based on the MS curves of water and ammonia, the decomposition path has been characterised as a system of consecutive and competing reactions. The activation energies of the five effects for water and ammonia were discussed. On the basis of the kinetic model and the quantified MS data the stoichiometry for the whole pathway of the thermal decomposition of the title compound was construed.
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