Probing the role of surface activated oxygen species of CeO₂ nanocatalyst during the redox cycle in CO oxidation.

ABSTRACT: The oxygen species of CeO₂ nanocatalysts plays a key role in the CO oxidation. In this work, nanocrystalline CeO₂ with infrared spectroscopy detectable surface superoxide (O₂ ^-) species at room temperature is fabricated and CO oxidation is used as a probe reaction for the exploration of the characteristics of surface O₂ ^- species on the CeO₂ surface. We discover that the surface O₂ ^- species have ignorable influences on the overall reaction rate of CO oxidation on pure ceria by comparing P-CeO₂ (CeO₂ prepared by precipitation method) with HT-CeO₂ (CeO₂ prepared by hydrothermal method). It is concluded that the reaction between CO molecules and surfa

SUBMITTER: Zhang R 

PROVIDER: S-EPMC9477017 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature