H[subscript 2]-assisted CO[subscript 2] thermochemical reduction on La[subscript 0.9]Ca[subscript 0.1]FeO[subscript 3-δ] membranes: a kinetics study
Kinetics data for CO2 thermochemical reduction in an isothermal membrane reactor is required to identify the rate-limiting steps. Here, we report a detailed reaction kinetics study on this process supported by an La0.9Ca0.1FeO3-δ (LCF-91) membrane. The dependence of CO2 reduction rate on various ope...
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Wiley Blackwell
2017
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| Online Access: | http://hdl.handle.net/1721.1/112311 https://orcid.org/0000-0003-4084-3662 https://orcid.org/0000-0001-8730-272X |
| _version_ | 1826205638889308160 |
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| author | Wu, Xiaoyu Ghoniem, Ahmed F |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Wu, Xiaoyu Ghoniem, Ahmed F |
| author_sort | Wu, Xiaoyu |
| collection | MIT |
| description | Kinetics data for CO2 thermochemical reduction in an isothermal membrane reactor is required to identify the rate-limiting steps. Here, we report a detailed reaction kinetics study on this process supported by an La0.9Ca0.1FeO3-δ (LCF-91) membrane. The dependence of CO2 reduction rate on various operating conditions is examined such as CO2 concentration on the feed side, fuel concentrations on the sweep side and temperatures. CO2 reduction rate is proportional to the oxygen flux across the membrane, and the measured maximum fluxes are 0.191 and 0.164 μmol cm-2 s-1 with 9.5% H2 and 11.6% CO on the sweep side at 990oC, respectively. Fuel is used to maintain the chemical potential gradient across the membrane and CO is used by construction to derive the surface reaction kinetics. This membrane also exhibits stable performances for 106 hours. A resistance-network model is developed to describe the oxygen transport process and the kinetics data are parameterized using the experimental values. The model shows a transition of the rate limiting step between the surface reactions on the feed side and the sweep side depending on the operating conditions. |
| first_indexed | 2024-09-23T13:16:16Z |
| format | Article |
| id | mit-1721.1/112311 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T13:16:16Z |
| publishDate | 2017 |
| publisher | Wiley Blackwell |
| record_format | dspace |
| spelling | mit-1721.1/1123112022-10-01T14:11:07Z H[subscript 2]-assisted CO[subscript 2] thermochemical reduction on La[subscript 0.9]Ca[subscript 0.1]FeO[subscript 3-δ] membranes: a kinetics study Wu, Xiaoyu Ghoniem, Ahmed F Massachusetts Institute of Technology. Department of Mechanical Engineering Wu, Xiaoyu Ghoniem, Ahmed F Kinetics data for CO2 thermochemical reduction in an isothermal membrane reactor is required to identify the rate-limiting steps. Here, we report a detailed reaction kinetics study on this process supported by an La0.9Ca0.1FeO3-δ (LCF-91) membrane. The dependence of CO2 reduction rate on various operating conditions is examined such as CO2 concentration on the feed side, fuel concentrations on the sweep side and temperatures. CO2 reduction rate is proportional to the oxygen flux across the membrane, and the measured maximum fluxes are 0.191 and 0.164 μmol cm-2 s-1 with 9.5% H2 and 11.6% CO on the sweep side at 990oC, respectively. Fuel is used to maintain the chemical potential gradient across the membrane and CO is used by construction to derive the surface reaction kinetics. This membrane also exhibits stable performances for 106 hours. A resistance-network model is developed to describe the oxygen transport process and the kinetics data are parameterized using the experimental values. The model shows a transition of the rate limiting step between the surface reactions on the feed side and the sweep side depending on the operating conditions. 2017-11-28T19:46:06Z 2017-11-28T19:46:06Z 2017-11 2017-09 2017-11-28T19:08:52Z Article http://purl.org/eprint/type/JournalArticle 1864-5631 1864-564X http://hdl.handle.net/1721.1/112311 Wu, Xiao-Yu, and Ahmed F. Ghoniem. “H[subscript 2]-assisted CO[subscript 2] thermochemical reduction on La[subscript 0.9]Ca[subscript 0.1]FeO[subscript 3-δ] membranes: a kinetics study.” ChemSusChem (November 2017) © 2017 WILEY-VCH https://orcid.org/0000-0003-4084-3662 https://orcid.org/0000-0001-8730-272X http://dx.doi.org/10.1002/cssc.201701372 ChemSusChem Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Wiley Blackwell Xiaoyu Wu |
| spellingShingle | Wu, Xiaoyu Ghoniem, Ahmed F H[subscript 2]-assisted CO[subscript 2] thermochemical reduction on La[subscript 0.9]Ca[subscript 0.1]FeO[subscript 3-δ] membranes: a kinetics study |
| title | H[subscript 2]-assisted CO[subscript 2] thermochemical reduction on La[subscript 0.9]Ca[subscript 0.1]FeO[subscript 3-δ] membranes: a kinetics study |
| title_full | H[subscript 2]-assisted CO[subscript 2] thermochemical reduction on La[subscript 0.9]Ca[subscript 0.1]FeO[subscript 3-δ] membranes: a kinetics study |
| title_fullStr | H[subscript 2]-assisted CO[subscript 2] thermochemical reduction on La[subscript 0.9]Ca[subscript 0.1]FeO[subscript 3-δ] membranes: a kinetics study |
| title_full_unstemmed | H[subscript 2]-assisted CO[subscript 2] thermochemical reduction on La[subscript 0.9]Ca[subscript 0.1]FeO[subscript 3-δ] membranes: a kinetics study |
| title_short | H[subscript 2]-assisted CO[subscript 2] thermochemical reduction on La[subscript 0.9]Ca[subscript 0.1]FeO[subscript 3-δ] membranes: a kinetics study |
| title_sort | h subscript 2 assisted co subscript 2 thermochemical reduction on la subscript 0 9 ca subscript 0 1 feo subscript 3 δ membranes a kinetics study |
| url | http://hdl.handle.net/1721.1/112311 https://orcid.org/0000-0003-4084-3662 https://orcid.org/0000-0001-8730-272X |
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