AI Article Synopsis
- - The research focuses on nanocrystalline CeO (ceria) and how the oxygen species on its surface affect CO oxidation reactions, using infrared spectroscopy to detect surface superoxide species at room temperature.
- - Findings indicate that these surface O species have minimal impact on the overall reaction speed of CO oxidation, as shown by comparing the properties of CeO produced through different methods (precipitation vs. hydrothermal processes).
- - The study concludes that the interaction between CO and surface O is a rapid first step in the redox cycle, while the release of lattice oxygen from the surface is the slower, rate-determining step in the catalytic process.
Article Abstract
The oxygen species of CeO nanocatalysts plays a key role in the CO oxidation. In this work, nanocrystalline CeO with infrared spectroscopy detectable surface superoxide (O ) species at room temperature is fabricated and CO oxidation is used as a probe reaction for the exploration of the characteristics of surface O species on the CeO surface. We discover that the surface O species have ignorable influences on the overall reaction rate of CO oxidation on pure ceria by comparing P-CeO (CeO prepared by precipitation method) with HT-CeO (CeO prepared by hydrothermal method). It is concluded that the reaction between CO molecules and surface O species is the first and the fast step in the whole redox cycle, while the release of surface lattice oxygen is the second and the rate determining step of the catalysts. This work gives an intuitionistic exploration on the redox properties of pure nanocrystalline CeO with surface O species and reveals the influences of these species in the whole redox circle of CO oxidation.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9477017 | PMC |
| http://dx.doi.org/10.1039/d2ra03533b | DOI Listing |
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