Halite-structured (MgCoNiMnFe)Ox high entropy oxide (HEO) for chemical looping dry reforming of methane
The configurational disorder of high entropy oxides (HEOs) promotes the reversible exsolution–redissolution of constituent metal species. This unique feature could be exploited to facilitate cyclic lattice oxygen storage and exchange. Herein, we report an in situ generated, halite-structured (MgCoNi...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/179144 |
| _version_ | 1826122827191812096 |
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| author | Shao, Yu Wu, Chao Xi, Shibo Tan, Preston Wu, Xianyue Saqline, Syed Liu, Wen |
| author2 | School of Chemistry, Chemical Engineering and Biotechnology |
| author_facet | School of Chemistry, Chemical Engineering and Biotechnology Shao, Yu Wu, Chao Xi, Shibo Tan, Preston Wu, Xianyue Saqline, Syed Liu, Wen |
| author_sort | Shao, Yu |
| collection | NTU |
| description | The configurational disorder of high entropy oxides (HEOs) promotes the reversible exsolution–redissolution of constituent metal species. This unique feature could be exploited to facilitate cyclic lattice oxygen storage and exchange. Herein, we report an in situ generated, halite-structured (MgCoNiMnFe)Ox HEO, which simultaneously functions as a redox catalyst and an oxygen carrier for dry reforming of methane in a chemical looping process (CL–DRM). Accordingly, the (MgCoNiMnFe)Ox/ZrO2 HEO catalyst exhibits outstanding DRM activity, syngas selectivity and cyclic stability compared to medium-entropy oxides and bimetallic oxides over 100 CL–DRM cycles at 800 °C. XRD analysis verified the entropy-mediated preservation of the alloy/HEO/ZrO2 catalytic structure over CL–DRM cycles. XAFS studies revealed the reversible and cyclic evolution–dissolution of Ni, Fe, Co over redox cycles. The exsolved NiFeCo nanoalloy exhibited high efficiency in activating CH4. This study has demonstrated the potential applications of HEO-based catalysts in efficient chemical looping processes. |
| first_indexed | 2024-10-01T05:54:31Z |
| format | Journal Article |
| id | ntu-10356/179144 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:54:31Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1791442024-07-22T01:34:36Z Halite-structured (MgCoNiMnFe)Ox high entropy oxide (HEO) for chemical looping dry reforming of methane Shao, Yu Wu, Chao Xi, Shibo Tan, Preston Wu, Xianyue Saqline, Syed Liu, Wen School of Chemistry, Chemical Engineering and Biotechnology Cambridge Centre for Advanced Research and Education in Singapore Engineering High entropy oxides Chemical looping The configurational disorder of high entropy oxides (HEOs) promotes the reversible exsolution–redissolution of constituent metal species. This unique feature could be exploited to facilitate cyclic lattice oxygen storage and exchange. Herein, we report an in situ generated, halite-structured (MgCoNiMnFe)Ox HEO, which simultaneously functions as a redox catalyst and an oxygen carrier for dry reforming of methane in a chemical looping process (CL–DRM). Accordingly, the (MgCoNiMnFe)Ox/ZrO2 HEO catalyst exhibits outstanding DRM activity, syngas selectivity and cyclic stability compared to medium-entropy oxides and bimetallic oxides over 100 CL–DRM cycles at 800 °C. XRD analysis verified the entropy-mediated preservation of the alloy/HEO/ZrO2 catalytic structure over CL–DRM cycles. XAFS studies revealed the reversible and cyclic evolution–dissolution of Ni, Fe, Co over redox cycles. The exsolved NiFeCo nanoalloy exhibited high efficiency in activating CH4. This study has demonstrated the potential applications of HEO-based catalysts in efficient chemical looping processes. National Research Foundation (NRF) This research is funded by the National Research Foundation (NRF), Prime Minister’s Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) programme. 2024-07-22T01:34:36Z 2024-07-22T01:34:36Z 2024 Journal Article Shao, Y., Wu, C., Xi, S., Tan, P., Wu, X., Saqline, S. & Liu, W. (2024). Halite-structured (MgCoNiMnFe)Ox high entropy oxide (HEO) for chemical looping dry reforming of methane. Applied Catalysis B: Environment and Energy, 355, 124191-. https://dx.doi.org/10.1016/j.apcatb.2024.124191 0926-3373 https://hdl.handle.net/10356/179144 10.1016/j.apcatb.2024.124191 2-s2.0-85192788933 355 124191 en CREATE Applied Catalysis B: Environment and Energy © 2024 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies. |
| spellingShingle | Engineering High entropy oxides Chemical looping Shao, Yu Wu, Chao Xi, Shibo Tan, Preston Wu, Xianyue Saqline, Syed Liu, Wen Halite-structured (MgCoNiMnFe)Ox high entropy oxide (HEO) for chemical looping dry reforming of methane |
| title | Halite-structured (MgCoNiMnFe)Ox high entropy oxide (HEO) for chemical looping dry reforming of methane |
| title_full | Halite-structured (MgCoNiMnFe)Ox high entropy oxide (HEO) for chemical looping dry reforming of methane |
| title_fullStr | Halite-structured (MgCoNiMnFe)Ox high entropy oxide (HEO) for chemical looping dry reforming of methane |
| title_full_unstemmed | Halite-structured (MgCoNiMnFe)Ox high entropy oxide (HEO) for chemical looping dry reforming of methane |
| title_short | Halite-structured (MgCoNiMnFe)Ox high entropy oxide (HEO) for chemical looping dry reforming of methane |
| title_sort | halite structured mgconimnfe ox high entropy oxide heo for chemical looping dry reforming of methane |
| topic | Engineering High entropy oxides Chemical looping |
| url | https://hdl.handle.net/10356/179144 |
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