Dual‐Functional Core‐Shell CNF@CuO <sub>x</sub> ‐CeO <sub>y</sub> Nanofiber for Efficient Simultaneous Low‐Temperature Catalytic Hydrolysis of Carbonyl Sulfide and Methyl Mercaptan
Lina Sun, Xin Song, Kai Li, Ping Ning
Abstract
Abstract Sulfur impurities, such as carbonyl sulfide (COS) and methyl mercaptan (CH 3 SH), lower the value of industrial furnace gas. Therefore, a deep desulfurization is necessary. In this study, core‐shell nanofiber catalysts are synthesized and employed for the catalytic hydrolysis of COS and CH 3 SH. The core‐shell nanofiber catalyst (CNF@CuO x ‐CeO y ) is shown to facilitate the 100% simultaneous removal of COS and CH 3 SH using a catalytic hydrolysis reaction at 200 °C. COS requires a lower hydrolysis reaction temperature than CH 3 SH. Copper oxide (CuO) and cerium oxide (CeO 2 ) have been identified as the primary catalytic hydrolysis active components for COS and CH 3 SH, respectively. The incorporation of Ce modifies the oxidation characteristics of CNF@CuO x ‐CeO y , thereby impacting the secondary oxidation of desulfurization products. Concurrently, the incorporation of Ce can enhance the formation of CuO and reduce oxidation, thereby mitigating the deactivation of the active components. Lattice oxygen promotes the production of hydroxyl groups. The ─OH, C─H, and ─CHO groups facilitate the catalytic hydrolysis of COS and CH 3 SH. The main hydrolysis products of COS are hydrogen sulfide (H 2 S) and carbon dioxide (CO 2 ), and the main hydrolysis products of CH 3 SH are methane (CH 4 ), H 2 S, CO 2, and hydrogen (H 2 ). Furthermore, COS and CH 3 SH have been identified as suitable candidates for hydrolysis reactions on CuO and CeO 2 surfaces, respectively.