Synthesis of AlPO4 and kinetics of thermal decomposition of AlPO4·H2O-H4 precursor

• Published in: Journal of thermal analysis and calorimetry Vol. 91; no. 2; pp. 511 - 516
• Main Authors: Boonchom, B., Youngme, S., Srithanratana, T., Danvirutai, C.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.02.2008
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Inorganic Chemistry; Measurement Science and Instrumentation; Physical Chemistry; Polymer Sciences; H; non-isothermal dehydration kinetics; AlPO; O-H4; aluminum phosphate
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-007-8420-1

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)].