Zhu, Yafei and Zhou, Jingsong and Du, Yanping and Liu, Zhou and Zhou, Fei and Sun, Zhenchang and Lu, Wei and Xiong, Zhibo (2026) Influence of Hydrothermal Treatment on the Interaction of Active Components and Following COS + CS 2 Sulfation of Ce 0.5 Fe 0.5 O x ‐CP Catalyst for NH 3 ‐SCR Reaction. Applied Organometallic Chemistry, 40 (3): e70529. ISSN 0268-2605
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Abstract
Herein, the methods of co‐precipitation and hydrothermal treatment were proposed to regulate the promotional effect of COS + CS 2 sulfation on the NH 3 ‐SCR activity of Ce 0.5 Fe 0.5 O x catalyst. The results indicated that the co‐precipitation method contributed to the formation of Ce‐Fe solid solution in Ce 0.5 Fe 0.5 O x ‐CP catalyst, but the further hydrothermal treatment depressed the incorporation of Fe 3+ into cubic fluorite CeO 2 , promoting the formation of Fe 2 O 3 crystals while decreasing the defective sites of catalyst. Furthermore, the different interaction of active components not only influenced the NH 3 ‐SCR activity of Ce 0.5 Fe 0.5 O x ‐CP and Ce 0.5 Fe 0.5 O x ‐HT catalysts but also regulated the sulfation of COS + CS 2 on the catalysts surface. The further hydrothermal treatment decreased the concentration of iron species but increased the concentration of cerium species on the Ce 0.5 Fe 0.5 O x ‐CP catalyst surface. COS + CS 2 sulfation increased the surface Ce 3+ /(Ce 3+ +Ce 4+ ) and Fe 2+ /(Fe 3+ +Fe 2+ ) molar ratios of Ce 0.5 Fe 0.5 O x ‐HT effectively but decreased the calculated corresponding values of Ce 0.5 Fe 0.5 O x ‐CP. Furthermore, Ce 0.5 Fe 0.5 O x ‐HT‐S exhibited larger deposited surface sulfate, stronger medium–strong acid sites, and more active oxygen than Ce 0.5 Fe 0.5 O x ‐CP‐S due to the better surface conversion of COS + CS 2 .