Dynamic structure of active sites in ceria-supported Pt catalysts for the water gas shift reaction.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33568629.
- Also identified by DOI 10.1038/s41467-021-21132-4 and PMC identifier 7876036.
- 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
Oxide-supported noble metal catalysts have been extensively studied for decades for the water gas shift (WGS) reaction, a catalytic transformation central to a host of large volume processes that variously utilize or produce hydrogen. There remains considerable uncertainty as to how the specific features of the active metal-support interfacial bonding-perhaps most importantly the temporal dynamic changes occurring therein-serve to enable high activity and selectivity. Here we report the dynamic characteristics of a Pt/CeO<sub>2</sub> system at the atomic level for the WGS reaction and specifically reveal the synergistic effects of metal-support bonding at the perimeter region. We find that the perimeter Pt<sup>0</sup> - O vacancy-Ce<sup>3+</sup> sites are formed in the active structure, transformed at working temperatures and their appearance regulates the adsorbate behaviors. We find that the dynamic nature of this site is a key mechanistic step for the WGS reaction.