AI Article Synopsis
- Single-atom catalysts face challenges when used on supports with insufficient defects, particularly in environmental catalysis.
- A new defect-enrichment strategy using H reduction pretreatment greatly enhances surface defects in CeO-based supports, improving the dispersion and activity of Pt catalysts.
- The Pt catalysts benefit from embedded single atoms on the defect-rich CA support, leading to more efficient CO adsorption and O activation, resulting in better low-temperature CO oxidation performance.
Article Abstract
Effective synthesis and application of single-atom catalysts on supports lacking enough defects remain a significant challenge in environmental catalysis. Herein, we present a universal defect-enrichment strategy to increase the surface defects of CeO-based supports through H reduction pretreatment. The Pt catalysts supported by defective CeO-based supports, including CeO, CeZrO, and CeO/AlO (CA), exhibit much higher Pt dispersion and CO oxidation activity upon reduction activation compared to their counterpart catalysts without defect enrichment. Specifically, Pt is present as embedded single atoms on the CA support with enriched surface defects (CA-HD) based on which the highly active catalyst showing embedded Pt clusters (Pt) with the bottom layer of Pt atoms substituting the Ce cations in the CeO surface lattice can be obtained through reduction activation. Embedded Pt can better facilitate CO adsorption and promote O activation at Pt-CeO interfaces, thereby contributing to the superior low-temperature CO oxidation activity of the Pt/CA-HD catalyst after activation.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11256741 | PMC |
| http://dx.doi.org/10.1021/acs.est.4c03078 | DOI Listing |
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