Sulfurization- Desulfurization of Iron-Calcium Oxygen Carriers during Chemical Looping Combustion of Syngas
Abstract Chemical looping combustion of SO2-containing syngas with various fabricated iron-calcium oxygen carriers was studied to comprehend the sulfurization and desulfurization of oxygen carriers during combustion. Experimental results indicated calcium-iron oxygen carriers fabricated with CaO:Fe2...
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| Format: | Article |
| Language: | English |
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Springer
2023-09-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.220398 |
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| author | Yu-Lun Chen Young Ku Ya-Chun Chang |
| author_facet | Yu-Lun Chen Young Ku Ya-Chun Chang |
| author_sort | Yu-Lun Chen |
| collection | DOAJ |
| description | Abstract Chemical looping combustion of SO2-containing syngas with various fabricated iron-calcium oxygen carriers was studied to comprehend the sulfurization and desulfurization of oxygen carriers during combustion. Experimental results indicated calcium-iron oxygen carriers fabricated with CaO:Fe2O3 weight ratio of 3:7 and calcined at 800°C (CaFe-378) was suitable for chemical looping combustion of syngas. CaFe2O4 was noticed to be the dominant crystalline phase in CaFe-378 even after 10 redox operations. Reduction kinetics for chemical looping combustion of both H2 or CO in syngas with CaFe-378 were adequately described by the 2-dimension diffusion model. The activation energies of H2 and CO with CaFe-378 were determined to be 35.4 kJ mol−1 and 46.0 kJ mol−1, respectively. Calcium sulfide (CaS) was generated during the chemical looping combustion of SO2-containing syngas with CaFe-378. CaS was further oxidized to CaSO4 on the surface of CaFe-378 during air regeneration, which might inhibit the complete regeneration of iron oxides. Satisfactory regeneration of sulfurized oxygen carriers was accomplished by introducing hydrogen after the air-regeneration because of the reduction of calcium sulfate to calcium oxide. |
| format | Article |
| id | doaj-art-46f22fd98a17496285f8921c84686802 |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2023-09-01 |
| publisher | Springer |
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| series | Aerosol and Air Quality Research |
| spelling | doaj-art-46f22fd98a17496285f8921c846868022025-02-09T12:24:47ZengSpringerAerosol and Air Quality Research1680-85842071-14092023-09-0124211110.4209/aaqr.220398Sulfurization- Desulfurization of Iron-Calcium Oxygen Carriers during Chemical Looping Combustion of SyngasYu-Lun Chen0Young Ku1Ya-Chun Chang2Department of Chemical Engineering, National Taiwan University of Science and TechnologyDepartment of Chemical Engineering, National Taiwan University of Science and TechnologyDepartment of Chemical Engineering, National Taiwan University of Science and TechnologyAbstract Chemical looping combustion of SO2-containing syngas with various fabricated iron-calcium oxygen carriers was studied to comprehend the sulfurization and desulfurization of oxygen carriers during combustion. Experimental results indicated calcium-iron oxygen carriers fabricated with CaO:Fe2O3 weight ratio of 3:7 and calcined at 800°C (CaFe-378) was suitable for chemical looping combustion of syngas. CaFe2O4 was noticed to be the dominant crystalline phase in CaFe-378 even after 10 redox operations. Reduction kinetics for chemical looping combustion of both H2 or CO in syngas with CaFe-378 were adequately described by the 2-dimension diffusion model. The activation energies of H2 and CO with CaFe-378 were determined to be 35.4 kJ mol−1 and 46.0 kJ mol−1, respectively. Calcium sulfide (CaS) was generated during the chemical looping combustion of SO2-containing syngas with CaFe-378. CaS was further oxidized to CaSO4 on the surface of CaFe-378 during air regeneration, which might inhibit the complete regeneration of iron oxides. Satisfactory regeneration of sulfurized oxygen carriers was accomplished by introducing hydrogen after the air-regeneration because of the reduction of calcium sulfate to calcium oxide.https://doi.org/10.4209/aaqr.220398Chemical looping combustionCaO/Fe2O3 oxygen carrierSulfurization desulfurization |
| spellingShingle | Yu-Lun Chen Young Ku Ya-Chun Chang Sulfurization- Desulfurization of Iron-Calcium Oxygen Carriers during Chemical Looping Combustion of Syngas Aerosol and Air Quality Research Chemical looping combustion CaO/Fe2O3 oxygen carrier Sulfurization desulfurization |
| title | Sulfurization- Desulfurization of Iron-Calcium Oxygen Carriers during Chemical Looping Combustion of Syngas |
| title_full | Sulfurization- Desulfurization of Iron-Calcium Oxygen Carriers during Chemical Looping Combustion of Syngas |
| title_fullStr | Sulfurization- Desulfurization of Iron-Calcium Oxygen Carriers during Chemical Looping Combustion of Syngas |
| title_full_unstemmed | Sulfurization- Desulfurization of Iron-Calcium Oxygen Carriers during Chemical Looping Combustion of Syngas |
| title_short | Sulfurization- Desulfurization of Iron-Calcium Oxygen Carriers during Chemical Looping Combustion of Syngas |
| title_sort | sulfurization desulfurization of iron calcium oxygen carriers during chemical looping combustion of syngas |
| topic | Chemical looping combustion CaO/Fe2O3 oxygen carrier Sulfurization desulfurization |
| url | https://doi.org/10.4209/aaqr.220398 |
| work_keys_str_mv | AT yulunchen sulfurizationdesulfurizationofironcalciumoxygencarriersduringchemicalloopingcombustionofsyngas AT youngku sulfurizationdesulfurizationofironcalciumoxygencarriersduringchemicalloopingcombustionofsyngas AT yachunchang sulfurizationdesulfurizationofironcalciumoxygencarriersduringchemicalloopingcombustionofsyngas |