A Study on the Redox Characteristics of Oxygen Carriers CaSnO3 and Materials Partially Substituted with Co and Ce for Chemical Looping Combustion

• Published in: The Korean journal of chemical engineering Vol. 42; no. 4; pp. 791 - 801
• Main Authors: Baek, Seung Hun, Park, Sang Jun, Kim, Hyang-Dong, Sohn, Jung Min
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2025; Springer Nature B.V; 한국화학공학회
• Subjects: Biotechnology; Catalysis; Chemical engineering; Chemical reduction; Chemistry; Chemistry and Materials Science; Completion time; Fluidized bed combustion; Industrial Chemistry/Chemical Engineering; Materials Science; Melting points; Original Article; Oxygen transfer; Perovskite structure; Perovskites; Structural stability; Substitutes; Transition metals; 화학공학; Chemical looping combustion (CLC); Oxygen carrier (OC); Ca–Sn-based metal oxide; Perovskite structure
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-024-00337-5

As a transition metal to be used for oxygen carrier, Sn-based oxides were expected to have high theoretical oxygen transfer capacity and have potential, and despite the low melting point, cycle stability was secured by forming a Ca–Sn perovskite structure. Nevertheless, it was also confirmed that high structural stability leads to a lower oxygen transfer rate compared to other oxygen carriers, that is, a relatively late reduction reaction completion time. In this study, in order to improve the oxygen transfer rate in the reduction reaction of Ca–Sn oxygen carriers, it was confirmed whether it was actually improved by partially replacing Co and Ce at the Ca site and whether it was applicable as oxygen carriers. It was confirmed that the substances that partially substituted Ce did not improve the oxygen transfer rate, and at the same time, the oxygen transfer capacity was partially reduced compared to CaSnO 3 . However, Ca 0.9 Co 0.1 SnO 3 reduced the reduction reaction time by 20% compared to CaSnO 3 . These findings suggest that Co is a promising candidate for improving the oxygen transfer rate of CaSnO 3 -based oxygen carriers in CLC processes.