Alleviating inhibitory effect of H2 on low-temperature water-gas shift reaction activity of Pt/CeO2 catalyst by forming CeO2 nano-patches on Pt nano-particles
SCIE
SCOPUS
- Title
- Alleviating inhibitory effect of H2 on low-temperature water-gas shift reaction activity of Pt/CeO2 catalyst by forming CeO2 nano-patches on Pt nano-particles
- Authors
- Lee, Jaeha; Shin, Dongjae; Lee, Eunwon; Li, Chengbin; Kim, Ji Man; Han, Jeong Woo; Kim, Do Heui
- Date Issued
- 2022-05-15
- Publisher
- Elsevier BV
- Abstract
- Pt/CeO2 has gained much attention for their high activity in low-temperature (LT) water-gas shift (WGS) reaction. However, the inclusion of H2 in the feed as in the practical reaction condition significantly degrades the LT-WGS activity of the Pt/CeO2 catalysts. In this contribution, the activity of Pt/CeO2 catalyst under the feed gas containing excess H2 (20 vol% of H2) was enhanced more than three times by forming CeO2 nano-patches on Pt nano-particles. Both in-situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory calculation results indicate that dissociated H2 on the Pt nano-particle inhibits the activity of the Pt/CeO2 catalysts by occupying the active sites (Pt nano-particle-CeO2 interface). On the other hand, thin CeO2 nano-patches on Pt nano-particle suppressed the H2 dissociation. As a result, the WGS reactivity of the active Pt nano-particle-CeO2 interface was less affected by H2, granting the catalysts the high activity under the practical reaction conditions.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/109305
- DOI
- 10.1016/j.apcatb.2021.121038
- ISSN
- 0926-3373
- Article Type
- Article
- Citation
- Applied Catalysis B: Environmental, vol. 305, 2022-05-15
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