Thermal Decomposition and Dehydration Kinetics of Tetra(piperidinium) Octamolybdate Tetrahydrate in Air

✍ Scribed by Zong-Jun KU; Zhong-Hai ZHANG; Zhi-Guo ZHANG; Li-Na WANG; Ke-Li ZHANG

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 262 KB
• Volume: 26
• Category: Article
• ISSN: 0256-7660
• DOI: 10.1002/cjoc.200890161

✦ Synopsis

Thermal decomposition of tetra(piperidinium) octamolybdate tetrahydrate, [C 5 H 10 NH 2 ] 4 [Mo 8 O 26 ]•4H 2 O, was investigated in air by means of TG-DTG/DTA, DSC, TG-IR and SEM. TG-DTG/DTA curves showed that the decomposition proceeded through three well-defined steps with DTA peaks closely corresponding to mass loss obtained. Kinetics analysis of its dehydration step was performed under non-isothermal conditions. The dehydration activation energy was calculated through Friedman and Flynn-Wall-Ozawa (FWO) methods, and the best-fit dehydration kinetic model function was estimated through the multiple linear regression method. The activation energy for the dehydration step of [C 5 H 10 NH 2 ] 4 [Mo 8 O 26 ]•4H 2 O was 139.7 kJ/mol. The solid particles became smaller accompanied by the thermal decomposition of the title compound.