Probing the Atomistic Reaction Pathways in CuO/C Catalysts.
basic_science · Level V
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- Record sourced from PubMed, PMID 37807279.
- Also identified by DOI 10.1021/acs.nanolett.3c02651.
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Abstract
CuO<sub><i>x</i></sub>/C catalysts have been used in the selective catalytic reduction of NO<sub><i>x</i></sub> because of the exceptional low-temperature denitration (de-NO<sub><i>x</i></sub>) activity. A fundamental understanding of the reaction between CuO and C is critical for controlling the component of CuO<sub><i>x</i></sub>/C and thus optimizing the catalytic performance. In this study, a transmission electron microscope equipped with an <i>in situ</i> heating device was utilized to investigate the atomic-scale reaction between CuO and C. We report two reaction mechanisms relying on the volume ratio between C and CuO: (1) The reduction from CuO to Cu<sub>2</sub>O (when the ratio is < ∼31%); (2) the reduction of CuO into polycrystalline Cu (when the ratio is > ∼34%). The atomistic reduction pathway can be well interpreted by considering the diffusion of O vacancy through the first-principle calculations. The atomic-scale exploration of CuO/C offers ample prospects for the design of industrial de-NO<sub><i>x</i></sub> catalysts in the future.