Oxidation kinetics of typical high FeO ferrous spinels

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2024-04-21 DOI:10.1016/j.tca.2024.179758

Chenmei Tang , Congcong Yang , Jian Pan , Deqing Zhu , Zhengqi Guo

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Abstract

In this study, the isothermal oxidation kinetics of magnetite (OM), high-Mg magnetite (MM), titanomagnetite (TM), and chromite (CM) were investigated by applying thermogravimetry (TG) analysis at temperatures ranging from 1073 K to 1223 K. The results show that different high-FeO spinels possess distinct oxidizability. The oxidation process of OM in the temperature range from 1073 K to 1223 K is faster than others, followed by MM and TM. While CM exhibits the poorest oxidizability, and generally undergoes complex phase transitions. In the initial stage of oxidation, high FeO spinels have a higher oxidation rate due to the surface oxidation of spinel particles. However, the oxidation rate gradually declines in the later stages of oxidation due to increased internal diffusion resistance. The results of oxidation kinetics indicate that the initial oxidation stage of four spinels can be described as random nucleation and subsequent growth mechanism. The average apparent activation energies of the initial oxidation stage of OM, MM, TM, and CM are 25.09 kJ/mol, 32.39 kJ/mol, 58.10 kJ/mol, and 82.42 kJ/mol, respectively.

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典型高氧化铁尖晶石的氧化动力学

本研究通过热重分析法（TG）研究了磁铁矿（OM）、高镁磁铁矿（MM）、钛磁铁矿（TM）和铬铁矿（CM）在 1073 K 至 1223 K 温度范围内的等温氧化动力学。在 1073 K 至 1223 K 的温度范围内，OM 的氧化过程比其他材料快，其次是 MM 和 TM。而 CM 的氧化性最差，一般会发生复杂的相变。在氧化的初始阶段，由于尖晶石颗粒的表面氧化作用，高FeO尖晶石的氧化速率较高。但在氧化后期，由于内部扩散阻力增加，氧化率逐渐下降。氧化动力学结果表明，四种尖晶石的初始氧化阶段可描述为随机成核和随后的生长机制。OM、MM、TM 和 CM 初始氧化阶段的平均表观活化能分别为 25.09 kJ/mol、32.39 kJ/mol、58.10 kJ/mol 和 82.42 kJ/mol。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes