التفاصيل البيبلوغرافية
| العنوان: |
Oxidation behavior of FeV2O4 and FeCr2O4 particles in the air: Nonisothermal kinetic and reaction mechanism. |
| المؤلفون: |
Xiang, Junyi, Lu, Xi, Bai, Luwei, Rao, Hongru, Liu, Sheng, Huang, Qingyun, Zhang, Shengqin, Pei, Guishang, Lü, Xuewei |
| المصدر: |
International Journal of Minerals, Metallurgy & Materials; Aug2024, Vol. 31 Issue 8, p1839-1848, 10p |
| مستخلص: |
High-temperature oxidation behavior of ferrovanadium (FeV2O4) and ferrochrome (FeCr2O4) spinels is crucial for the application of spinel as an energy material, as well as for the clean usage of high-chromium vanadium slag. Herein, the nonisothermal oxidation behavior of FeV2O4 and FeCr2O4 prepared by high-temperature solid-state reaction was examined by thermogravimetry and X-ray diffraction (XRD) at heating rates of 5, 10, and 15 K/min. The apparent activation energy was determined by the Kissinger–Akahira–Sunose (KAS) method, whereas the mechanism function was elucidated by the Malek method. Moreover, in-situ XRD was conducted to deduce the phase transformation of the oxidation mechanism for FeV2O4 and FeCr2O4. The results reveal a gradual increase in the overall apparent activation energies for FeV2O4 and FeCr2O4 during oxidation. Four stages of the oxidation process are observed based on the oxidation conversion rate of each compound. The oxidation mechanisms of FeV2O4 and FeCr2O4 are complex and have distinct mechanisms. In particular, the chemical reaction controls the entire oxidation process for FeV2O4, whereas that for FeCr2O4 transitions from a three-dimensional diffusion model to a chemical reaction model. According to the in-situ XRD results, numerous intermediate products are observed during the oxidation process of both compounds, eventually resulting in the final products FeVO4 and V2O5 for FeV2O4 and Fe2O3 and Cr2O3 for FeCr2O4, respectively. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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