Effect of alkali earth metal doping on the CuO/Al₂O₃ oxygen carrier agglomeration resistance during chemical looping combustion
The influence of alkali earth metals (AEMs, including Ca, Sr and Ba) doping on the performance of CuO/Al2O3 oxygen carrier (OC) in chemical looping combustion (CLC) was investigated. The OCs using solid-state synthesis method were evaluated in a fluidized bed reactor using municipal solid waste (MSW...
| Main Authors: | , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/160099 |
| _version_ | 1826130012125790208 |
|---|---|
| author | Liu, Guicai Chang, Chia Chyi Zhao, Ya Veksha, Andrei Giannis, Apostolos Lim, Teik-Thye Lisak, Grzegorz |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Liu, Guicai Chang, Chia Chyi Zhao, Ya Veksha, Andrei Giannis, Apostolos Lim, Teik-Thye Lisak, Grzegorz |
| author_sort | Liu, Guicai |
| collection | NTU |
| description | The influence of alkali earth metals (AEMs, including Ca, Sr and Ba) doping on the performance of CuO/Al2O3 oxygen carrier (OC) in chemical looping combustion (CLC) was investigated. The OCs using solid-state synthesis method were evaluated in a fluidized bed reactor using municipal solid waste (MSW) syngas as fuel for 50 redox cycles. It was found that the doping of AEMs enhanced the CLC performance on CuO/Al2O3. XRD characterization and TGA analysis showed that aluminates of AEMs were formed in the doped OCs leading to the segregation of CuO from CuAl2O4 spinel, thereby promoting the redox kinetics. The OCs doped with AEMs exhibited enhanced stability and agglomeration resistance throughout multiple redox cycles in the fluidized bed experiments. CuO/Al2O3 containing 40 wt% CuO suffered from severe agglomeration and deactivation during initial 5 cycles, while the OCs with Ba, Sr and Ca doping respectively deferred the agglomeration to 15-20th, 20-25th and >50th cycle. 5–10 wt% Ca-doping content exhibited great stability without deactivation or agglomeration issues during 50 cycles, but excess Ca doping (≥20 wt%) showed severe agglomeration. The agglomeration was attributed to the outward migration of Cu/CuO, leading to the segregation from CuAl2O4 and surface enrichment. The enhanced agglomeration resistance with AEM doping was mainly attributed to outward migration of AEM species and inward migration of Cu species during the synthesis process. |
| first_indexed | 2024-10-01T07:49:36Z |
| format | Journal Article |
| id | ntu-10356/160099 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:49:36Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1600992022-07-16T20:11:35Z Effect of alkali earth metal doping on the CuO/Al₂O₃ oxygen carrier agglomeration resistance during chemical looping combustion Liu, Guicai Chang, Chia Chyi Zhao, Ya Veksha, Andrei 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::Waste management Chemical Looping Oxygen Carrier The influence of alkali earth metals (AEMs, including Ca, Sr and Ba) doping on the performance of CuO/Al2O3 oxygen carrier (OC) in chemical looping combustion (CLC) was investigated. The OCs using solid-state synthesis method were evaluated in a fluidized bed reactor using municipal solid waste (MSW) syngas as fuel for 50 redox cycles. It was found that the doping of AEMs enhanced the CLC performance on CuO/Al2O3. XRD characterization and TGA analysis showed that aluminates of AEMs were formed in the doped OCs leading to the segregation of CuO from CuAl2O4 spinel, thereby promoting the redox kinetics. The OCs doped with AEMs exhibited enhanced stability and agglomeration resistance throughout multiple redox cycles in the fluidized bed experiments. CuO/Al2O3 containing 40 wt% CuO suffered from severe agglomeration and deactivation during initial 5 cycles, while the OCs with Ba, Sr and Ca doping respectively deferred the agglomeration to 15-20th, 20-25th and >50th cycle. 5–10 wt% Ca-doping content exhibited great stability without deactivation or agglomeration issues during 50 cycles, but excess Ca doping (≥20 wt%) showed severe agglomeration. The agglomeration was attributed to the outward migration of Cu/CuO, leading to the segregation from CuAl2O4 and surface enrichment. The enhanced agglomeration resistance with AEM doping was mainly attributed to outward migration of AEM species and inward migration of Cu species during the synthesis process. Economic Development Board (EDB) National Environmental Agency (NEA) Submitted/Accepted version This work is supported by the National Environment Agency, Ministry of Sustainability and Environment, 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. 2022-07-13T04:53:46Z 2022-07-13T04:53:46Z 2022 Journal Article Liu, G., Chang, C. C., Zhao, Y., Veksha, A., Giannis, A., Lim, T. & Lisak, G. (2022). Effect of alkali earth metal doping on the CuO/Al₂O₃ oxygen carrier agglomeration resistance during chemical looping combustion. Journal of Cleaner Production, 366, 132970-. https://dx.doi.org/10.1016/j.jclepro.2022.132970 0959-6526 https://hdl.handle.net/10356/160099 10.1016/j.jclepro.2022.132970 366 132970 en WTE CRP 1701 105 Journal of Cleaner Production © 2022 Elsevier Ltd. All rights reserved. This paper was published in Journal of Cleaner Production and is made available with permission of Elsevier Ltd. application/pdf |
| spellingShingle | Engineering::Environmental engineering::Waste management Chemical Looping Oxygen Carrier Liu, Guicai Chang, Chia Chyi Zhao, Ya Veksha, Andrei Giannis, Apostolos Lim, Teik-Thye Lisak, Grzegorz Effect of alkali earth metal doping on the CuO/Al₂O₃ oxygen carrier agglomeration resistance during chemical looping combustion |
| title | Effect of alkali earth metal doping on the CuO/Al₂O₃ oxygen carrier agglomeration resistance during chemical looping combustion |
| title_full | Effect of alkali earth metal doping on the CuO/Al₂O₃ oxygen carrier agglomeration resistance during chemical looping combustion |
| title_fullStr | Effect of alkali earth metal doping on the CuO/Al₂O₃ oxygen carrier agglomeration resistance during chemical looping combustion |
| title_full_unstemmed | Effect of alkali earth metal doping on the CuO/Al₂O₃ oxygen carrier agglomeration resistance during chemical looping combustion |
| title_short | Effect of alkali earth metal doping on the CuO/Al₂O₃ oxygen carrier agglomeration resistance during chemical looping combustion |
| title_sort | effect of alkali earth metal doping on the cuo al₂o₃ oxygen carrier agglomeration resistance during chemical looping combustion |
| topic | Engineering::Environmental engineering::Waste management Chemical Looping Oxygen Carrier |
| url | https://hdl.handle.net/10356/160099 |
| work_keys_str_mv | AT liuguicai effectofalkaliearthmetaldopingonthecuoal2o3oxygencarrieragglomerationresistanceduringchemicalloopingcombustion AT changchiachyi effectofalkaliearthmetaldopingonthecuoal2o3oxygencarrieragglomerationresistanceduringchemicalloopingcombustion AT zhaoya effectofalkaliearthmetaldopingonthecuoal2o3oxygencarrieragglomerationresistanceduringchemicalloopingcombustion AT vekshaandrei effectofalkaliearthmetaldopingonthecuoal2o3oxygencarrieragglomerationresistanceduringchemicalloopingcombustion AT giannisapostolos effectofalkaliearthmetaldopingonthecuoal2o3oxygencarrieragglomerationresistanceduringchemicalloopingcombustion AT limteikthye effectofalkaliearthmetaldopingonthecuoal2o3oxygencarrieragglomerationresistanceduringchemicalloopingcombustion AT lisakgrzegorz effectofalkaliearthmetaldopingonthecuoal2o3oxygencarrieragglomerationresistanceduringchemicalloopingcombustion |