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Dynamic Structure of Active Sites in Ceria-Supported Pt Catalysts for the Water Gas Shift Reaction

Published

Author(s)

Yuanyuan Li, Matthew Kottwitz, Joshua L. Vincent, Zongyuan Liu, Michael J. Enright, Lihua Zhang, Jiahao Huang, Sanjaya D. Senanayake, Wei-Chang Yang, Peter A. Crozier, Ralph G. Nuzzo, Anatoly I. Frenkel

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/CeO2 system at the atomic level for the WGS reaction and specifically reveal the synergistic effects of metal-support bonding at the perimeter region. We found that the perimeter Pt0−O vacancy−Ce3+ sites are formed in the active structure, transformed at working temperatures and its appearance regulates the adsorbate behaviors. We find that the dynamic nature of this site is a key mechanistic step for the WGS reaction.
Citation
Nature Communications
Volume
12
Issue
1

Keywords

in situ TEM, ETEM, water gas shift reaction, dynamic structure, catalysis

Citation

Li, Y. , Kottwitz, M. , Vincent, J. , Liu, Z. , Enright, M. , Zhang, L. , Huang, J. , Senanayake, S. , Yang, W. , Crozier, P. , Nuzzo, R. and Frenkel, A. (2021), Dynamic Structure of Active Sites in Ceria-Supported Pt Catalysts for the Water Gas Shift Reaction, Nature Communications, [online], https://dx.doi.org/10.1038/s41467-021-21132-4, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=931403 (Accessed October 22, 2021)
Created February 9, 2021, Updated October 12, 2021