The use of strontium ferrite perovskite as an oxygen carrier in the chemical looping epoxidation of ethylene
The use of strontium ferrite perovskite as an oxygen carrier in the chemical looping epoxidation of ethylene
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DOI：
10.1016/j.apcatb.2020.119821
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发表时间：
2021-06
期刊：
影响因子：
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通讯作者：
S. Gabra;Ewa J. Marek;S. Poulston;G. Williams;J. S. Dennis
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文献类型：
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作者：
S. Gabra;Ewa J. Marek;S. Poulston;G. Williams;J. S. Dennis
在利用化学环将乙烯环氧化成环氧乙烷的过程中，Ag负载在锶铁氧体钙钛矿上，其中Ag充当催化剂，而钙钛矿充当氧载体。本研究探讨了基于锶铁氧体的各种氧载体如何影响化学链环氧化。通过结合不同比例的两种钙钛矿相：立方 SrFeO3 和层状 Ruddlesden-Popper (RP) 相：Sr3Fe2O7，来改变氧载体的结构。 SrFeO3:RP 比例为 1:1 的样品获得了最大环氧乙烷产率，与仅使用 SrFeO3 相比，环氧乙烷产率增加了约 4 倍（即 0.4-1.6% 环氧乙烷产率）。这些结果证实了设计用于化学链环氧化的氧载体以获得最佳性能的可能性。这种设计方法可以扩展到其他化学循环过程，以调整所讨论反应的氧载体的性能。
In the epoxidation of ethylene to ethylene oxide using chemical looping, Ag is supported on strontium ferrite perovskite, where Ag acts as the catalyst while the perovskite acts as an oxygen carrier. This study explores how various oxygen carriers based on strontium ferrite affect chemical looping epoxidation. The structure of the oxygen carrier was varied by incorporating different ratios of two perovskite phases: cubic SrFeO3, and a layered Ruddlesden-Popper (RP) phase: Sr3Fe2O7. Maximum yield of ethylene oxide was obtained for the sample with 1:1 SrFeO3:RP ratio, leading to an increase in the yield of ethylene oxide around 4 times, compared to only SrFeO3(i.e.0.4–1.6% ethylene oxide yield). These results confirm a possibility of designing the oxygen carriers used in chemical looping epoxidation towards optimal performance. Such a design approach can be expanded to other chemical looping processes to tune the performance of oxygen carrier for the reaction in question.