Evaluation of multi-cycle performance of chemical looping dry reforming using CO₂ as an oxidant with Fe-Ni bimetallic oxides

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• 作者：Zhen Huang^a ; ^{huangzhen@ms.giec.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Huanqi Jiang^a ; Fang He^b ; Dezhen Chen^a ; Guoqiang Wei^b ; Kun Zhao^b ; Anqing Zheng^b ; Yipeng Feng^b ; Zengli Zhao^b ; Haibin Li^b
• 关键词：Chemical looping ; Oxygen carrier ; Nickel ferrite ; CO2 utilization ; Multi-cycle performance
• 刊名：Journal of Energy Chemistry
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：25
• 期：1
• 页码：62-70
• 全文大小：1748 K

文摘

Chemical looping dry reforming (CLDR) is an innovative technology for CO₂ utilization using the chemical looping principle. The CLDR process consists of three stages, i.e. CH₄ reduction, CO₂ reforming, and air oxidation. Spinel nickel ferrite (NiFe₂O₄) was prepared and its multi-cycle performance as an oxygen carrier for CLDR was experimentally investigated. X-ray diffraction (XRD) and Laser Raman spectroscopy showed that a pure spinel crystalline phase (NiFe₂O₄) was obtained by a parallel flow co-precipitating method. NiFe₂O₄ was reduced into Fe–Ni alloy and wustite (Fe_xO) during the CH₄ reduction process. Subsequent oxidation of the reduced oxygen carrier was performed with CO₂ as an oxidant to form an intermediate state: a mixture of spinel Ni_1−xFe_2+xO₄, Fe_2+yO₄ and metallic Ni. And CO was generated in parallel during this stage. Approximate 185 mL of CO was generated for 1 g spinel NiFe₂O₄ in a single cycle. The intermediate oxygen carrier was fully oxidized in the air oxidation stage to form a mixture of Ni_1+xFe_2−xO₄ and Fe₂O₃. Although the original state of oxygen carrier (NiFe₂O₄) was not fully regenerated and agglomeration was observed, a good recyclability was shown in 10 successive redox cycles.