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Synthesis of AlPO 4 and kinetics of thermal decomposition of AlPO 4 ·H 2 O-H4 precursor



The thermal decomposition of aluminum phosphate monohydrate AlPO 4 ·H 2 O-H4 was investigated in air using TG-DTG/DTA. The AlPO 4 ·H 2 O-H4 decomposes in one step and final decomposition product (AlPO 4 ) was studied by X-ray powder diffraction, FTIR and FT-Raman spectroscopy. The activation energies of dehydration reaction of AlPO 4 ·H 2 O-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 AlPO 4 ·H 2 O-H4 by different methods and techniques were found to be consistent. The kinetic model that better described the reaction of dehydration for AlPO 4 ·H 2 O-H4 was the F n 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)).



Journal of Thermal Analysis and CalorimetrySpringer Journals

Published: Feb 1, 2008

DOI: 10.1007/s10973-007-8420-1

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