Ba–Al-decorated iron ore as bifunctional oxygen carrier and HCl sorbent for chemical looping combustion of syngas
The simultaneous high-temperature HCl removal and chemical looping combustion (CLC) of syngas over barium-decorated oxygen carriers (OCs) was investigated. An iron ore was coated with a layer of sorbent (5 wt%) containing Ba and Al compounds (molar ratios Al:Ba = 0.5, 2.0, 4.5, 8.0, 12) and used for...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/152307 |
| _version_ | 1826124254256562176 |
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| author | Liu, Guicai Wang, Haiming Deplazes, Severin Veksha, Andrei Wirz-Töndury, Christian Giannis, Apostolos Lim, Teik-Thye Lisak, Grzegorz |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Liu, Guicai Wang, Haiming Deplazes, Severin Veksha, Andrei Wirz-Töndury, Christian Giannis, Apostolos Lim, Teik-Thye Lisak, Grzegorz |
| author_sort | Liu, Guicai |
| collection | NTU |
| description | The simultaneous high-temperature HCl removal and chemical looping combustion (CLC) of syngas over barium-decorated oxygen carriers (OCs) was investigated. An iron ore was coated with a layer of sorbent (5 wt%) containing Ba and Al compounds (molar ratios Al:Ba = 0.5, 2.0, 4.5, 8.0, 12) and used for model syngas combustion at 800 °C. It was found that the synthesized materials can effectively remove HCl from the syngas. The HCl removal capacity increased with the Ba loading, and the HCl breakthrough capacity can reach 0.0345 mmol/g for the OC with Al:Ba = 0.5, resulting in the formation of BaCl₂. The conversion of Ba species into BaCl₂ was 17.3%. Besides the HCl sorption, the coating with Ba and Al compounds enhanced the activity of lattice oxygen and improved the reducibility of OCs during CLC due to the Ba–Fe composite formed on the OCs surface. Compared to the iron ore, the combustion efficiencies of the coated OC with Al:Ba = 4.5 for CO and H₂ increased from 62.2% and 87.2% to 99.6% and 95.9%, respectively. Through fluidized bed experiments and thermodynamic calculations, the feasibility of sorbent regeneration was demonstrated by treating OCs with a mixture of CO₂ and H₂O at 800–1000 °C. The HCl desorption rate increased with temperature and nearly complete sorbent regeneration (99.6%) could be achieved at 1000 °C. These findings demonstrate that Ba–Al-decorated iron ore can be used as bifunctional material in CLC process since it enables simultaneous high-temperature HCl removal and syngas combustion. |
| first_indexed | 2024-10-01T06:17:39Z |
| format | Journal Article |
| id | ntu-10356/152307 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:17:39Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1523072021-08-02T02:13:32Z Ba–Al-decorated iron ore as bifunctional oxygen carrier and HCl sorbent for chemical looping combustion of syngas Liu, Guicai Wang, Haiming Deplazes, Severin Veksha, Andrei Wirz-Töndury, Christian Giannis, Apostolos Lim, Teik-Thye Lisak, Grzegorz School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Residues and Resource Reclamation Centre Engineering::Environmental engineering Municipal Solid Waste Syngas Hydrogen Chloride Sorbent The simultaneous high-temperature HCl removal and chemical looping combustion (CLC) of syngas over barium-decorated oxygen carriers (OCs) was investigated. An iron ore was coated with a layer of sorbent (5 wt%) containing Ba and Al compounds (molar ratios Al:Ba = 0.5, 2.0, 4.5, 8.0, 12) and used for model syngas combustion at 800 °C. It was found that the synthesized materials can effectively remove HCl from the syngas. The HCl removal capacity increased with the Ba loading, and the HCl breakthrough capacity can reach 0.0345 mmol/g for the OC with Al:Ba = 0.5, resulting in the formation of BaCl₂. The conversion of Ba species into BaCl₂ was 17.3%. Besides the HCl sorption, the coating with Ba and Al compounds enhanced the activity of lattice oxygen and improved the reducibility of OCs during CLC due to the Ba–Fe composite formed on the OCs surface. Compared to the iron ore, the combustion efficiencies of the coated OC with Al:Ba = 4.5 for CO and H₂ increased from 62.2% and 87.2% to 99.6% and 95.9%, respectively. Through fluidized bed experiments and thermodynamic calculations, the feasibility of sorbent regeneration was demonstrated by treating OCs with a mixture of CO₂ and H₂O at 800–1000 °C. The HCl desorption rate increased with temperature and nearly complete sorbent regeneration (99.6%) could be achieved at 1000 °C. These findings demonstrate that Ba–Al-decorated iron ore can be used as bifunctional material in CLC process since it enables simultaneous high-temperature HCl removal and syngas combustion. Economic Development Board (EDB) Ministry of the Environment and Water Resources Nanyang Technological University National Environmental Agency (NEA) This work is supported by the National Environment Agency, Ministry of the Environment and Water Resources, Singapore, under the Waste-to-Energy Competitive Research Programme (WTE CRP 1701 105). The authors also acknowledge the management of Nanyang Environment and Water Research Institute and Economic Development Board, Singapore for the support. 2021-08-02T02:13:32Z 2021-08-02T02:13:32Z 2021 Journal Article Liu, G., Wang, H., Deplazes, S., Veksha, A., Wirz-Töndury, C., Giannis, A., Lim, T. & Lisak, G. (2021). Ba–Al-decorated iron ore as bifunctional oxygen carrier and HCl sorbent for chemical looping combustion of syngas. Combustion and Flame, 223, 230-242. https://dx.doi.org/10.1016/j.combustflame.2020.09.021 0010-2180 https://hdl.handle.net/10356/152307 10.1016/j.combustflame.2020.09.021 2-s2.0-85092445445 223 230 242 en WTE CRP 1701 105 Combustion and Flame © 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved. |
| spellingShingle | Engineering::Environmental engineering Municipal Solid Waste Syngas Hydrogen Chloride Sorbent Liu, Guicai Wang, Haiming Deplazes, Severin Veksha, Andrei Wirz-Töndury, Christian Giannis, Apostolos Lim, Teik-Thye Lisak, Grzegorz Ba–Al-decorated iron ore as bifunctional oxygen carrier and HCl sorbent for chemical looping combustion of syngas |
| title | Ba–Al-decorated iron ore as bifunctional oxygen carrier and HCl sorbent for chemical looping combustion of syngas |
| title_full | Ba–Al-decorated iron ore as bifunctional oxygen carrier and HCl sorbent for chemical looping combustion of syngas |
| title_fullStr | Ba–Al-decorated iron ore as bifunctional oxygen carrier and HCl sorbent for chemical looping combustion of syngas |
| title_full_unstemmed | Ba–Al-decorated iron ore as bifunctional oxygen carrier and HCl sorbent for chemical looping combustion of syngas |
| title_short | Ba–Al-decorated iron ore as bifunctional oxygen carrier and HCl sorbent for chemical looping combustion of syngas |
| title_sort | ba al decorated iron ore as bifunctional oxygen carrier and hcl sorbent for chemical looping combustion of syngas |
| topic | Engineering::Environmental engineering Municipal Solid Waste Syngas Hydrogen Chloride Sorbent |
| url | https://hdl.handle.net/10356/152307 |
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