Influence of Al2O3 support on the thermal decomposition of ammonium metavanadate |
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| Authors: | A A Said |
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| Affiliation: | (1) Department of Chemistry, Faculty of Science, United Arab Emirates University, P.O. Box 17551, Al-Ain, United Arab Emirates;(2) Present address: Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt |
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| Abstract: | The thermal decomposition of ammonium metavanadate (AMV) supported on aluminium oxide was investigated using differential thermal analysis, thermogravimetry, infrared and X-ray diffraction techniques. The results obtained revealed that the decomposition of AMV supported on alumina proceeded in three decomposition stages. Alumina was found to enhance only the decomposition of the intermediate ammonium hexavanadate to produce V2O5. In addition, the values of activation energies of the various decomposition stages were accompanied by a significant decrease on decreasing the concentration of AMV. The infrared spectra indicated that the band corresponds to the surface site V=O strongly affected by the presence of Al2O3. Finally, an interaction between Al2O3 and V2O5 occurred at 660 °C giving well-crystallized AlVO4. |
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