*Article* **Enhanced Carbon Dioxide Decomposition Using Activated SrFeO3**−<sup>δ</sup>

**Jaeyong Sim 1,2, Sang-Hyeok Kim 1,2, Jin-Yong Kim 1,2, Ki Bong Lee 2,\*, Sung-Chan Nam <sup>1</sup> and Chan Young Park 1,\***


Received: 28 September 2020; Accepted: 30 October 2020; Published: 3 November 2020

**Abstract:** 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, SrFeCo0.5Ox, in a continuous-flow system. In this study, we report enhanced efficiency, reliability under isothermal conditions, and catalytic reproducibility through cyclic tests using SrFeO3−<sup>δ</sup>. This ferrite needs an activation process, and 3.5 vol% H2/N2 was used in this experiment. Activated oxygen-deficient SrFeO3−<sup>δ</sup> can decompose CO2 into carbon monoxide (CO) and carbon (C). Although SrFeO3−<sup>δ</sup> is a well-known material in different fields, no studies have reported its use in CO2 decomposition applications. The efficiency of CO2 decomposition using SrFeO3−<sup>δ</sup> reached ≥90%, and decomposition (≥80%) 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.

**Keywords:** greenhouse gas; climate change; CO2 decomposition; CO2 utilization; SrFeO3−<sup>x</sup>
