Optimisation of syngas production from a novel two-step chemical looping reforming process using Fe-dolomite as oxygen carriers
The production of syngas from hydrogen carbon feedstocks such as natural gas and biomass is of high importance to the chemical industry. In conventional chemical looping steam reforming(CLSR), the composition of the syngas produced is limited by the chemical equilibrium of the water-gas-shift reacti...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/161702 |
| _version_ | 1824455529826615296 |
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| author | Xu, Tingting Wang, Xun Xiao, Bo Zhao, Haibo Liu, Wen |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Xu, Tingting Wang, Xun Xiao, Bo Zhao, Haibo Liu, Wen |
| author_sort | Xu, Tingting |
| collection | NTU |
| description | The production of syngas from hydrogen carbon feedstocks such as natural gas and biomass is of high importance to the chemical industry. In conventional chemical looping steam reforming(CLSR), the composition of the syngas produced is limited by the chemical equilibrium of the water-gas-shift reaction. In this study, we demonstrate that a two-step chemical looping reforming (TS-CLR) process is capable of alleviating the equilibrium limit to produce syngas of higher CO and H2 contents. For example, the total mole fraction of H2 and CO in the syngas produced from the conventional CLSR of toluene at 900 °C is limited to below 89.4 vol% (dry basis), whereas TS-CLR could produce syngas with >94 vol% of CO and H2 under the same condintions. The TS-CLR process is best carried out in a bed of Fe-dolomite oxygen carriers with a Ca:Fe ratio of 1:1 (denoted as C1F1). Compared to the pure Ca2Fe2O5 and Fe2O3/Al2O3 oxygen carriers, the C1F1 affords improvements in syngas yield, carbon conversion and syngas purity. The superior performance of C1F1 is attributed to the promotion of the lattice oxygen activities of Ca2Fe2O5 by MgO, as well as its excellent phase reversibility over redox cycles. |
| first_indexed | 2025-02-19T03:39:40Z |
| format | Journal Article |
| id | ntu-10356/161702 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:39:40Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1617022023-12-29T06:54:02Z Optimisation of syngas production from a novel two-step chemical looping reforming process using Fe-dolomite as oxygen carriers Xu, Tingting Wang, Xun Xiao, Bo Zhao, Haibo Liu, Wen School of Chemical and Biomedical Engineering Cambridge Centre for Advanced Research and Education in Singapore (CARES) Engineering::Chemical engineering Chemical Looping Syngas The production of syngas from hydrogen carbon feedstocks such as natural gas and biomass is of high importance to the chemical industry. In conventional chemical looping steam reforming(CLSR), the composition of the syngas produced is limited by the chemical equilibrium of the water-gas-shift reaction. In this study, we demonstrate that a two-step chemical looping reforming (TS-CLR) process is capable of alleviating the equilibrium limit to produce syngas of higher CO and H2 contents. For example, the total mole fraction of H2 and CO in the syngas produced from the conventional CLSR of toluene at 900 °C is limited to below 89.4 vol% (dry basis), whereas TS-CLR could produce syngas with >94 vol% of CO and H2 under the same condintions. The TS-CLR process is best carried out in a bed of Fe-dolomite oxygen carriers with a Ca:Fe ratio of 1:1 (denoted as C1F1). Compared to the pure Ca2Fe2O5 and Fe2O3/Al2O3 oxygen carriers, the C1F1 affords improvements in syngas yield, carbon conversion and syngas purity. The superior performance of C1F1 is attributed to the promotion of the lattice oxygen activities of Ca2Fe2O5 by MgO, as well as its excellent phase reversibility over redox cycles. Nanyang Technological University National Research Foundation (NRF) Submitted/Accepted version The research received financial support by National Natural Science Foundation of China (No. 22109048 and No. 22005112), China Postdoctoral Science Foundation (No. 2021M691121) and the National Science Foundation for Distinguished Young Scholars of China (Grant No. 52025063). The authors also acknowledge the Analytical and Testing Center of Huazhong University of Science & Technology (HUST) for the analyses of the samples. Tingting Xu and Wen Liu acknowledge financial support by National Research Foundation under its Campus for Research Excellence and Technological Enterprise (CREATE) programme. Wen Liu also thanks Nanyang Technological University for its Start-up Grant. 2022-09-15T07:44:00Z 2022-09-15T07:44:00Z 2022 Journal Article Xu, T., Wang, X., Xiao, B., Zhao, H. & Liu, W. (2022). Optimisation of syngas production from a novel two-step chemical looping reforming process using Fe-dolomite as oxygen carriers. Fuel Processing Technology, 228, 107169-. https://dx.doi.org/10.1016/j.fuproc.2022.107169 0378-3820 https://hdl.handle.net/10356/161702 10.1016/j.fuproc.2022.107169 2-s2.0-85123222233 228 107169 en Fuel Processing Technology © 2022 Elsevier B.V. All rights reserved. This paper was published in Fuel Processing Technology and is made available with permission of Elsevier B.V. application/pdf |
| spellingShingle | Engineering::Chemical engineering Chemical Looping Syngas Xu, Tingting Wang, Xun Xiao, Bo Zhao, Haibo Liu, Wen Optimisation of syngas production from a novel two-step chemical looping reforming process using Fe-dolomite as oxygen carriers |
| title | Optimisation of syngas production from a novel two-step chemical looping reforming process using Fe-dolomite as oxygen carriers |
| title_full | Optimisation of syngas production from a novel two-step chemical looping reforming process using Fe-dolomite as oxygen carriers |
| title_fullStr | Optimisation of syngas production from a novel two-step chemical looping reforming process using Fe-dolomite as oxygen carriers |
| title_full_unstemmed | Optimisation of syngas production from a novel two-step chemical looping reforming process using Fe-dolomite as oxygen carriers |
| title_short | Optimisation of syngas production from a novel two-step chemical looping reforming process using Fe-dolomite as oxygen carriers |
| title_sort | optimisation of syngas production from a novel two step chemical looping reforming process using fe dolomite as oxygen carriers |
| topic | Engineering::Chemical engineering Chemical Looping Syngas |
| url | https://hdl.handle.net/10356/161702 |
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