Fe-Doped γ-Al 2 O 3 Catalysts Derived from Waste PET and Cans for Selective COS Hydrolysis

High Resolution Image Download MS PowerPoint Slide Waste PET bottles, aluminum cans, and tinplate cans were successfully upcycled into Fe-doped γ-Al 2 O 3 catalysts via a one-pot hydrothermal process, followed by calcination. The resulting Fe/Al 2 O 3 -f catalyst exhibited a mesoporous structure with uniformly dispersed Fe species and enhanced surface basicity. Comprehensive characterization confirmed the stable incorporation of Fe into the alumina lattice, contributing to a high structural integrity and abundant reactive sites. Catalytic tests showed nearly complete COS conversion and H 2 S selectivity at 400 °C under optimized water vapor concentration, with excellent stability maintained over 24 h. Kinetic analysis revealed a low apparent activation energy of 21.89 kJ/mol, indicating a favorable energy profile for the COS activation. Postreaction XPS analysis verified the retention of Fe 3+ species, surface hydroxyl enrichment, and minimal sulfate accumulation, supporting a Langmuir–Hinshelwood mechanism involving coadsorbed COS and hydroxyl groups. This study provides a scalable and sustainable approach for fabricating high-performance catalysts from municipal solid wastes, offering a low-cost solution for sulfur-containing gas purification and advancing circular economy practices in environmental catalysis.