Effective Macroporous Core-Shell Structure of Alumina-Supported Spinel Ferrite for Carbon Dioxide Splitting Based on Chemical Looping

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• 作者：Dr. Yu Fu ; Prof. Shenggang Li ; Dr. Jun Zhang and Prof. Yuhan Sun
• 刊名：Energy Technology
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：4
• 期：11
• 页码：1349-1357
• 全文大小：3354K
• ISSN：2194-4296

文摘

Spinel ferrite (NiFe₂O₄) supported on spherical Al₂O₃ was used to split CO₂ based on chemical looping. The NiFe₂O₄/Al₂O₃ material, which had a macroporous core–shell structure, was obtained by pretreating the Al₂O₃ support at 1200 °C. It displays the highest redox capacity and the best reproducibility during the chemical looping amongst all the samples tested. However, the pretreatment of the Al₂O₃ support at other temperatures leads to structures that are unfavorable for the diffusion of CO₂ and oxygen, which thus reduces the reactivity. N₂ adsorption–desorption isotherms, XRD, field-emission SEM, TEM, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy were used to elucidate the formation of the macroporous core–shell structure and the other unfavorable structures. The initial structure, phase of the Al₂O₃ support, and the process of spinel formation in solid solutions influence the structural evolution of the NiFe₂O₄/Al₂O₃ materials significantly.