Unique structure of active platinum-bismuth site for oxidation of carbon monoxide.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34099668.
- Also identified by DOI 10.1038/s41467-021-23696-7 and PMC identifier 8184822.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
As the technology development, the future advanced combustion engines must be designed to perform at a low temperature. Thus, it is a great challenge to synthesize high active and stable catalysts to resolve exhaust below 100 °C. Here, we report that bismuth as a dopant is added to form platinum-bismuth cluster on silica for CO oxidation. The highly reducible oxygen species provided by surface metal-oxide (M-O) interface could be activated by CO at low temperature (~50 °C) with a high CO<sub>2</sub> production rate of 487 μmol<sub>CO2</sub>·g<sub>Pt</sub><sup>-1</sup>·s<sup>-1</sup> at 110 °C. Experiment data combined with density functional calculation (DFT) results demonstrate that Pt cluster with surface Pt-O-Bi structure is the active site for CO oxidation via providing moderate CO adsorption and activating CO molecules with electron transformation between platinum atom and carbon monoxide. These findings provide a unique and general approach towards design of potential excellent performance catalysts for redox reaction.