Study of Dimensional Changes during Redox Cycling of Oxygen Carrier Materials for Chemical Looping Combustion

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• 作者：Anita Fossdal ; Ove Darell ; Arnold Lambert ; Erin Schols ; Elodie Comte ; Rebecca Leenman ; Richard Blom
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：January 15, 2015
• 年：2015
• 卷：29
• 期：1
• 页码：314-320
• 全文大小：621K
• ISSN：1520-5029

文摘

Dimensional and phase changes of four candidate oxygen carrier materials for chemical looping combustion are investigated by dilatometry and high-temperature X-ray diffraction during four redox cycles. NiO/Ni₂AlO₄ does not exhibit significant dimensional changes during cycling, and it is shown that the support material also contributes to the oxygen carrying capacity. CaMn_0.875Ti_0.125O₃ exhibited good chemical stability and small dimensional changes upon redox cycling. Cu_0.95Fe_1.05AlO₄ showed a one-dimensional expansion of 9% after the experiments, and significant phase changes were seen. The complex set of reactions occurring during redox cycling of ilmenite (FeTiO₃) was shown to be accompanied by dimensional changes, giving non-steady dimensional changes during the oxidation and reduction steps.