Highly sulfur tolerant and regenerable Pt/CeO2 catalyst for waste to energy. (November 2021)

• Record Type: Journal Article
• Authors: Lee, Yeol-Lim; Kim, Kyoung-Jin; Hong, Ga-Ram; Ahn, Seon-Yong; Kim, Beom-Jun; Shim, Jae-Oh; Roh, Hyun-Seog
• Is Part Of: Renewable energy. Volume 178(2021)
• Page Start: 334
• Page End: 343
• Publication Date: 2021-11
• Subjects: Waste-derived synthesis gas -- Water-gas shift reaction -- Sulfur -- Pt/CeO2 catalyst -- Oxygen storage capacity; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2021.06.084
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: Water-gas shift reaction was applied to upcycle a waste-derived synthesis gas, which contains sulfur as an impurity. Pt/CeO2 was chosen as an appropriate catalyst through a metal and support screening study. The Pt/CeO2 catalyst showed stable catalytic activity without any deactivation for 100 h when the H2 S was injected to 100 ppm, and still showed a sulfur tolerance even after 1, 000 ppm of H2 S was injected. In particular, the catalytic activity was fully regenerated when the H2 S injection was stopped, regardless of the H2 S concentration. The high sulfur tolerance and regeneration rate of Pt/CeO2 catalyst was due to the high oxygen storage capacity. This accelerates the redox mechanism of the water-gas shift reaction, and also helps the removal of the adsorbed sulfur on the Pt through the oxidation reaction with the mobile oxygen originated from the CeO2 . Highlights: Waste-derived syngas includes sulfur, which act as a poison to catalyst. Active metal and support screening study was conducted. Pt/CeO2 catalyst showed high sulfur tolerance and regeneration rate. High oxygen storage capacity of the Pt/CeO2 was the key of superior performance. Mobile oxygen attacked the adsorbed sulfur, resulting to the catalyst regeneration.