Highly sulfur tolerant and regenerable Pt/CeO2 catalyst for waste to energy

• Published in: Renewable energy Vol. 178; pp. 334 - 343
• Main Authors: Lee, Yeol-Lim, Kim, Kyoung-Jin, Hong, Ga-Ram, Ahn, Seon-Yong, Kim, Beom-Jun, Shim, Jae-Oh, Roh, Hyun-Seog
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2021
• Subjects: Oxygen storage capacity; Pt/CeO2 catalyst; Sulfur; Waste-derived synthesis gas; Water-gas shift reaction; Waste-derived synthesis gas; Pt/CeO2 catalyst; Sulfur; Water-gas shift reaction; Oxygen storage capacity
• ISSN: 0960-1481; 1879-0682
• DOI: 10.1016/j.renene.2021.06.084

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 H2S was injected to 100 ppm, and still showed a sulfur tolerance even after 1,000 ppm of H2S was injected. In particular, the catalytic activity was fully regenerated when the H2S injection was stopped, regardless of the H2S 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. •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.