Enhanced Carbon Dioxide Decomposition Using Activated SrFeO_3−d

• Main Authors: Jaeyong Sim, Sang-Hyeok Kim, Jin-Yong Kim, Ki Bong Lee, Sung-Chan Nam, Chan Young Park
• Format: Article
• Language: English
• Published: MDPI AG 2020-11-01
• Series: Catalysts
• Subjects: greenhouse gas; climate change; CO₂ decomposition; CO₂ utilization; SrFeO_3−x
• Online Access: https://www.mdpi.com/2073-4344/10/11/1278

Today, climate change caused by global warming has become a worldwide problem with increasing greenhouse gas (GHG) emissions. Carbon capture and storage technologies have been developed to capture carbon dioxide (CO₂); however, CO₂ storage and utilization technologies are relatively less developed. In this light, we have reported efficient CO₂ decomposition results using a nonperovskite metal oxide, SrFeCo_0.5O_x, in a continuous-flow system. In this study, we report enhanced efficiency, reliability under isothermal conditions, and catalytic reproducibility through cyclic tests using SrFeO_3−d. This ferrite needs an activation process, and 3.5 vol% H₂/N₂ was used in this experiment. Activated oxygen-deficient SrFeO_3−d can decompose CO₂ into carbon monoxide (CO) and carbon (C). Although SrFeO_3−d is a well-known material in different fields, no studies have reported its use in CO₂ decomposition applications. The efficiency of CO₂ decomposition using SrFeO_3−d reached ³90%, and decomposition (³80%) lasted for approximately 170 min. We also describe isothermal and cyclic experimental data for realizing commercial applications. We expect that these results will contribute to the mitigation of GHG emissions.