Abstract
Abstract Real-time multiple-ion detection trend analysis mass spectrometry has been employed to study the temperature-programmed decomposition of AlNH 4 (SO 4 ) 2 · 12H 2 O in the temperature range 300–1200 K. Significant correlations are established with certain non-isothermal solid state kinetic rate expressions through the use of fraction release plots obtained from Evolved Gas Analysis Mass Spectra (EGA-MS). The EGA mass spectra clearly resolve the dehydration stage and various other stages associated with the thermal decomposition. The dehydration step is concomitant with stage I of a three-stage ammonia release followed by the final decomposition of Al 2 (SO 4 ) 3 . These stages are found to comply with models based on random nucleation and diffusion approaches. A change in rate-governing mechanism was noticed with increase in the heating rate for the dehydration step. Relevant Arrhenius parameters such as the activation energy and pre-exponential factor were determined for all the decomposition stages. The ultimate product resulting from the decomposition was confirmed as γ-alumina by X-ray diffraction studies.
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