Thermal Decomposition and Dehydration Kinetics of Tetra(piperidinium) Octamolybdate Tetrahydrate in Air |
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Authors: | Zong‐Jun KU Zhong‐Hai ZHANG Zhi‐Guo ZHANG Li‐Na WANG Ke‐Li ZHANG |
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Institution: | 1. College of Chemistry and Materials Sciences, Xiaogan University, Xiaogan, Hubei 432000, China;2. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China |
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Abstract: | Thermal decomposition of tetra(piperidinium) octamolybdate tetrahydrate, C5H10NH2]4Mo8O26]·4H2O, 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 C5H10NH2]4Mo8O26]·4H2O was 139.7 kJ/mol. The solid particles became smaller accompanied by the thermal decomposition of the title compound. |
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Keywords: | polyoxometalate octamolybdate TG‐DTA DSC thermal decomposition dehydration kinetics |
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