4.7 Article

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

Journal

RENEWABLE ENERGY
Volume 178, Issue -, Pages 334-343

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.06.084

Keywords

Waste-derived synthesis gas; Water-gas shift reaction; Sulfur; Pt/CeO2 catalyst; Oxygen storage capacity

Funding

  1. National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1A2B5B01002346]

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The study demonstrated the use of water-gas shift reaction to upcycle waste-derived synthesis gas containing sulfur impurities. Pt/CeO2 catalyst showed stable catalytic activity at high sulfur concentrations and exhibited rapid regeneration capabilities.
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. (C) 2021 Elsevier Ltd. All rights reserved.

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