Abstract
The activation of CO2 on nickel surfaces is the first step of various CO2 conversion processes. Consequently, understanding the surface intermediates formed during this step and their adsorption sites is crucial for elucidating reaction mechanisms. In this study, we employ in situ infrared spectroscopy to investigate the interaction of 1 mbar CO2 with a model Ni(111) catalyst between 25°C and 300°C. Under these conditions, CO2 is activated via a direct dissociation into CO and atomic oxygen, while the oxidation state of the Ni(111) surface is primarily determined by residual H2 and O2. The high surface coverage of CO and oxygen at ambient CO2 pressure induces a competitive adsorption mechanism on the energetically favored hollow sites. This mechanism leads to a temperature-dependent distribution of CO between top and hollow sites, potentially explaining the effect of reaction conditions on the adsorption site of CO intermediates in CO2 conversion reactions.
Original language | English |
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Article number | 101890 |
Journal | Cell Reports Physical Science |
DOIs | |
Publication status | Published Online - 22 Mar 2024 |
Funding
This work was supported by the Israel Ministry of Energy and Infrastructure. R.B.D. acknowledges a doctoral fellowship from the Israel Ministry of Energy and Infrastructure. M.A.A. acknowledges the “la Caixa” Foundation postdoctoral fellowship. Publisher Copyright: © 2024 The Author(s)
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Materials Science
- General Engineering
- General Energy
- General Physics and Astronomy