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In-Situ Microscopic Study of Morphology Changes in Natural Hematite and Cu-Spinel Particles During Cyclic Redox Gas Exposures for Chemical Looping Applications

机译:循环氧化还原天然气曝光过程中天然赤铁矿和Cu - 尖晶石颗粒的形态学变化的原位显微镜研究

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Efficiency of the chemical looping combustion technology is adversely influenced by surface properties of oxygen carrier materials during oxidation-reduction process changes at elevated temperatures. In this work, natural hematite (Fe_2O_3) and alumina (Al_2O_3) supported Cu-spinel (CuFe_2O_4) oxygen carrier particles were isothermally exposed to redox gas cycles (air and 10 vol% CO-90 vol% Ar) at approximately 800°C and studied using a high temperature confocal scanning laser microscope for real time alterations in surface morphology, roughness, and particle volume. 3D topological scans from each cyclic gas exposure indicated hematite particles exhibited noticeable volume expansion in reduction and shrinkage in oxidation, corresponding to respective phase transformations. Materials surface changes during the redox gas cycles are discussed.
机译:化学循环燃烧技术的效率受到氧化过程中氧载体材料在升高的温度变化过程中的表面性质的不利影响。在该工作中,天然赤铁矿(Fe_2O_3)和氧化铝(Al_2O_3)支撑的Cu - 尖晶石(CuFe_2O_4)氧载体颗粒在约800℃和约800℃的氧化还原气体循环(空气和10Vol%CO-90VOL%AR)上是等温的。使用高温共焦扫描激光显微镜研究了表面形态,粗糙度和粒子体积的实时改变。来自每个循环气体暴露的3D拓扑扫描指示的赤铁矿颗粒在氧化中表现出明显的体积膨胀,对应于各自的相变。讨论了氧化还原气体循环期间的材料表面改变。

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