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Structural pillar effect of Sn substitution in SrFe 1- x Sn x O 3-δ catalysts for oxidative decomposition of 1,2-dichloroethane

Year: 2026
Type: article
Abstract: Chlorination-induced structural degradation limits the durability of perovskite catalysts for the oxidative decomposition of chlorinated organic compounds. Here, a series of SrFe 1−x Sn x O 3−δ (x = 0, 0.25, 0.50, 0.75 and 1.0) was investigated for oxidation of 1,2-dichloroethane (1,2-DCE), with emphasis on the relationship between activity, structural stability and regenerability. Partial Sn substitution improved light-off performance relative to SrFeO 3−δ , whereas SrSnO 3 exhibited little catalytic activity. Although SrFe 0.50 Sn 0.50 O 3−δ gave the highest conversion during temperature-programmed oxidation, SrFe 0.25 Sn 0.75 O 3−δ (SFSO75) exhibited a more favorable balance between activity and structural stability. Independent exposure tests to CO 2 and HCl revealed that Sn substitution enhanced resistance to carbonate and chloride formation, particularly after oxidative pretreatment. Under a dry reaction feed at 450 °C, SFSO75 retained approximately 40% conversion of 1,2-DCE after 12 h, exceeding that of unsubstituted SrFeO 3−δ . Calcination of spent SFSO75 in air effectively restored its perovskite structure, and the regenerated catalyst maintained conversion at approximately 60% during a subsequent reaction of 12 h despite its lower surface area compared with the fresh catalyst. These results demonstrate the roles of Sn in enhancing activity and stabilizing and regenerating the perovskite structure as an effective approach to sustaining the performance of strontium ferrate for 1,2-DCE oxidation. Furthermore, with cofeeding 2.7% water vapor, fresh SFSO75 maintained conversion near 70% over 12 h and largely preserved the perovskite structure.
DOI: 10.1039/d6cy01559j
Institution: Hokkaido University
Language: English
Open Access status: green
OpenAlex ID: W7223146206
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