{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/158875"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/158875","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"CO₂ Capture with Lithium Oxide in Molten Salt Media : A Case Study of CO₂ Capture via Electrochemically Produced Metal Oxide","abstract":"As the unprecedented temperature rise originating from anthropogenic carbon dioxide (CO₂) emission intensifies, the development of post-combustion carbon capture technologies has been urged. Although its maturity, conventional thermal swing processes using aqueous amines, suffer from significant limitations, including high energy requirements and sorbent degradation. Electrochemical CO₂ capture technologies, which use electrical energy instead of thermal energy, have emerged as an energy efficient way to capture CO₂. This shift not only improves energy efficiency but also reduces reliance on fossil fuels, further contributing to reduction in CO₂ emissions. This work explored the potential of electrochemical metal oxide formation for CO₂ capture, a promising alternative to amine-based systems due to its exceptional sorbent (i.e., metal oxide) stability. Li₂O in eutectic mixture of potassium nitrate (KNO₃) and lithium nitrate (LiNO₃) was chosen as a case study due to the relatively well-understood chemistry of the system and the potential synergistic effects between metal oxide and the molten salt. Primarily, we investigated the synergistic effect of Li₂O in nitrate molten salt via thermal gravimetric analysis. Next, electrochemically produced Li₂O by reduction of oxygen gas was tested as a CO₂ sorbent while investigating parameters affecting its conversion to lithium carbonate (Li₂CO₃). Through this study, we suggested dissolution model as a crucial pathway for conversion. Lastly, we explored the effect of adding nitrite ion (NO₂⁻) to the molten salt. Irreversible side reaction between NO₂⁻ and CO₂ was confirmed with X-ray diffraction and NOₓ measurement. This thesis demonstrates the feasibility of electrochemical metal oxide-based CO₂ capture, highlighting some considerations in the capture step.","abstract_html":"As the unprecedented temperature rise originating from anthropogenic carbon dioxide (CO₂) emission intensifies, the development of post-combustion carbon capture technologies has been urged. Although its maturity, conventional thermal swing processes using aqueous amines, suffer from significant limitations, including high energy requirements and sorbent degradation. Electrochemical CO₂ capture technologies, which use electrical energy instead of thermal energy, have emerged as an energy efficient way to capture CO₂. This shift not only improves energy efficiency but also reduces reliance on fossil fuels, further contributing to reduction in CO₂ emissions. This work explored the potential of electrochemical metal oxide formation for CO₂ capture, a promising alternative to amine-based systems due to its exceptional sorbent (i.e., metal oxide) stability. Li₂O in eutectic mixture of potassium nitrate (KNO₃) and lithium nitrate (LiNO₃) was chosen as a case study due to the relatively well-understood chemistry of the system and the potential synergistic effects between metal oxide and the molten salt. Primarily, we investigated the synergistic effect of Li₂O in nitrate molten salt via thermal gravimetric analysis. Next, electrochemically produced Li₂O by reduction of oxygen gas was tested as a CO₂ sorbent while investigating parameters affecting its conversion to lithium carbonate (Li₂CO₃). Through this study, we suggested dissolution model as a crucial pathway for conversion. Lastly, we explored the effect of adding nitrite ion (NO₂⁻) to the molten salt. Irreversible side reaction between NO₂⁻ and CO₂ was confirmed with X-ray diffraction and NOₓ measurement. This thesis demonstrates the feasibility of electrochemical metal oxide-based CO₂ capture, highlighting some considerations in the capture step.","abstract_has_math":false,"creators":["Byun, Gi Hyun"],"institution":"Massachusetts Institute of Technology","degree_name":"Master","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Mechanical Engineering","school":null,"contributors":[],"advisors":["Gallant, Betar M."],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-02","date_published":"2025-02","updated_at":"2026-07-22T22:21:33Z","subjects":[],"languages":[],"rights":["Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)","Copyright retained by author(s)"],"rights_urls":["https://creativecommons.org/licenses/by-sa/4.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1721.1/158875","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Gallant, Betar M."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. Department of Mechanical Engineering"]},{"key":"dc:creator","label":"Author","values":["Byun, Gi Hyun"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-03-24T18:48:55Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-03-24T18:48:55Z"]},{"key":"dc:date.issued","label":"Date","values":["2025-02"]},{"key":"dc:publisher","label":"Institution","values":["Massachusetts Institute of Technology"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master","Master of Science in Mechanical Engineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)","Copyright retained by author(s)"]},{"key":"dc:rights.uri","label":"Rights URI","values":["https://creativecommons.org/licenses/by-sa/4.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1721.1/158875"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["As the unprecedented temperature rise originating from anthropogenic carbon dioxide (CO₂) emission intensifies, the development of post-combustion carbon capture technologies has been urged. Although its maturity, conventional thermal swing processes using aqueous amines, suffer from significant limitations, including high energy requirements and sorbent degradation. Electrochemical CO₂ capture technologies, which use electrical energy instead of thermal energy, have emerged as an energy efficient way to capture CO₂. This shift not only improves energy efficiency but also reduces reliance on fossil fuels, further contributing to reduction in CO₂ emissions. This work explored the potential of electrochemical metal oxide formation for CO₂ capture, a promising alternative to amine-based systems due to its exceptional sorbent (i.e., metal oxide) stability. Li₂O in eutectic mixture of potassium nitrate (KNO₃) and lithium nitrate (LiNO₃) was chosen as a case study due to the relatively well-understood chemistry of the system and the potential synergistic effects between metal oxide and the molten salt. Primarily, we investigated the synergistic effect of Li₂O in nitrate molten salt via thermal gravimetric analysis. Next, electrochemically produced Li₂O by reduction of oxygen gas was tested as a CO₂ sorbent while investigating parameters affecting its conversion to lithium carbonate (Li₂CO₃). Through this study, we suggested dissolution model as a crucial pathway for conversion. Lastly, we explored the effect of adding nitrite ion (NO₂⁻) to the molten salt. Irreversible side reaction between NO₂⁻ and CO₂ was confirmed with X-ray diffraction and NOₓ measurement. This thesis demonstrates the feasibility of electrochemical metal oxide-based CO₂ capture, highlighting some considerations in the capture step."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.M."]},{"key":"dc:title","label":"Title","values":["CO₂ Capture with Lithium Oxide in Molten Salt Media : A Case Study of CO₂ Capture via Electrochemically Produced Metal Oxide"]}]}],"canonical_facts":{"dc:contributor.advisor":["Gallant, Betar M."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Mechanical Engineering"],"dc:creator":["Byun, Gi Hyun"],"dc:date.accessioned":["2025-03-24T18:48:55Z"],"dc:date.available":["2025-03-24T18:48:55Z"],"dc:date.issued":["2025-02"],"dc:description.abstract":["As the unprecedented temperature rise originating from anthropogenic carbon dioxide (CO₂) emission intensifies, the development of post-combustion carbon capture technologies has been urged. Although its maturity, conventional thermal swing processes using aqueous amines, suffer from significant limitations, including high energy requirements and sorbent degradation. Electrochemical CO₂ capture technologies, which use electrical energy instead of thermal energy, have emerged as an energy efficient way to capture CO₂. This shift not only improves energy efficiency but also reduces reliance on fossil fuels, further contributing to reduction in CO₂ emissions. This work explored the potential of electrochemical metal oxide formation for CO₂ capture, a promising alternative to amine-based systems due to its exceptional sorbent (i.e., metal oxide) stability. Li₂O in eutectic mixture of potassium nitrate (KNO₃) and lithium nitrate (LiNO₃) was chosen as a case study due to the relatively well-understood chemistry of the system and the potential synergistic effects between metal oxide and the molten salt. Primarily, we investigated the synergistic effect of Li₂O in nitrate molten salt via thermal gravimetric analysis. Next, electrochemically produced Li₂O by reduction of oxygen gas was tested as a CO₂ sorbent while investigating parameters affecting its conversion to lithium carbonate (Li₂CO₃). Through this study, we suggested dissolution model as a crucial pathway for conversion. Lastly, we explored the effect of adding nitrite ion (NO₂⁻) to the molten salt. Irreversible side reaction between NO₂⁻ and CO₂ was confirmed with X-ray diffraction and NOₓ measurement. This thesis demonstrates the feasibility of electrochemical metal oxide-based CO₂ capture, highlighting some considerations in the capture step."],"dc:description.degree":["S.M."],"dc:identifier.uri":["https://hdl.handle.net/1721.1/158875"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)","Copyright retained by author(s)"],"dc:rights.uri":["https://creativecommons.org/licenses/by-sa/4.0/"],"dc:title":["CO₂ Capture with Lithium Oxide in Molten Salt Media : A Case Study of CO₂ Capture via Electrochemically Produced Metal Oxide"],"dc:type":["Thesis"],"thesis:degree_name":["Master","Master of Science in Mechanical Engineering"]},"updated_at":"2026-07-22T22:21:33Z"}