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, J.[Lee, J.]; Shin, D.[Shin, D.]; Lee, E.[Lee, E.]; Li, C.[Li, C.]; Kim, J.M.[Kim, J.M.]; Han, J.W.[Han, J.W.]; Kim, D.H.[Kim, D.H.]
- Issue Date
- 15-May-2022
- Publisher
- Elsevier B.V.
- Keywords
- CeO2 nano-patch; Excess H2; In-situ diffuse reflectance infrared Fourier transform spectroscopy; Low temperature water-gas shift reaction; Pt nano-particle
- Citation
- Applied Catalysis B: Environmental, v.305
- Indexed
- SCIE
SCOPUS
- Journal Title
- Applied Catalysis B: Environmental
- Volume
- 305
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/94715
- DOI
- 10.1016/j.apcatb.2021.121038
- ISSN
- 0926-3373
- 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. © 2021 Elsevier B.V.
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Collections - Graduate School > Chemistry > 1. Journal Articles
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