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Li, Yuanyuan; Kottwitz, Matthew; Vincent, Joshua L; Enright, Michael J; Liu, Zongyuan; Zhang, Lihua; Huang, Jiahao; Senanayake, Sanjaya D; Yang, Wei-Chang D; Crozier, Peter A; Nuzzo, Ralph G; Frenkel, Anatoly I
Nature communications, 02/2021, Volume: 12, Issue: 1Journal Article
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 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 - O vacancy-Ce 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.
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