Abstract
The thermal decomposition of aluminum phosphate monohydrate AlPO4·H2O-H4 was investigated in air using TG-DTG/DTA. The AlPO4·H2O-H4 decomposes in one step and final decomposition product (AlPO4) was studied by X-ray powder diffraction, FTIR and FT-Raman spectroscopy. The activation energies of dehydration reaction of AlPO4·H2O-H4 were calculated through the isoconversional methods of Ozawa and Kissinger-Akahira-Sunose (KAS), and the possible conversion functions have been estimated through the comparative methods. The activation energy calculated for the decomposition of AlPO4·H2O-H4 by different methods and techniques were found to be consistent. The kinetic model that better described the reaction of dehydration for AlPO4·H2O-H4 was the Fn model as simple n-order reaction and the corresponding function is f(α)=(1-α)2.75 and g(α)=-[1-(1-a)-1.75/(1.75)].
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