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Evaluation of Microstructural Changes and Performance Degradation in Iron-Based Oxygen Carriers during Redox Cycling for Chemical Looping Systems with Image Analysis
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2018-04-13 , DOI: 10.1021/acs.iecr.7b04966
Yuya Saito 1 , Fumihiko Kosaka 1 , Noriaki Kikuchi 1 , Hiroyuki Hatano 2 , Junichiro Otomo 1
Affiliation  

A coupled analysis of the reaction kinetics and microstructural changes of Fe2O3/Al2O3 oxygen carriers during redox reaction cycles for chemical looping systems was conducted. The microstructural changes in the oxygen carrier particles were investigated using an image analysis method with cross-sectional backscattered electron images, and microstructural information such as the particle size, porosity, and two-phase boundary between the iron oxide and pores was obtained. The microstructural changes and the degradation kinetics during redox cycles were investigated under various operating conditions (reaction temperatures, reduction times, oxygen partial pressures during the oxidation process, and weight ratios of the oxygen carriers). The degradation coefficient and the reaction enthalpy of the particles in the oxidation process are linearly related, implying that increasing the local temperature of the oxygen carriers causes the coarsening of iron oxide particles via sintering and microstructural changes. Our analysis contributes to the design of highly stable oxygen carrier particles and the improvement of the operating conditions for chemical looping systems.

中文翻译:

用图像分析评估化学循环系统氧化还原循环过程中铁基氧气载体的微观结构变化和性能下降

Fe 2 O 3 / Al 2 O 3的反应动力学与微观结构变化的耦合分析在用于化学回路系统的氧化还原反应循环中进行了氧载体的研究。使用具有截面背向散射电子图像的图像分析方法研究了氧载体颗粒的微观结构变化,并获得了诸如粒度,孔隙率以及氧化铁与孔隙之间的两相边界之类的微观结构信息。在各种操作条件(反应温度,还原时间,氧化过程中的氧气分压和氧气载体的重量比)下研究了氧化还原循环过程中的微观结构变化和降解动力学。氧化过程中颗粒的降解系数和反应焓呈线性关系,这意味着提高氧载体的局部温度会导致烧结和微观结构变化,从而使氧化铁颗粒变粗大。我们的分析有助于设计高度稳定的氧气载体颗粒,并改善化学循环系统的操作条件。
更新日期:2018-04-14
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