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Title: Atomically Dispersed Pd–O Species on CeO 2(111) as Highly Active Sites for Low-Temperature CO Oxidation

Ceria-supported Pd is a promising heterogeneous catalyst for CO oxidation relevant to environmental cleanup reactions. Pd loaded onto a nanorod form of ceria exposing predominantly (111) facets is already active at 50 °C. Here we report a combination of CO-FTIR spectroscopy and theoretical calculations that allows assigning different forms of Pd on the CeO 2(111) surface during reaction conditions. Single Pd atoms stabilized in the form of PdO and PdO 2 in a CO/O 2 atmosphere participate in a catalytic cycle involving very low activation barriers for CO oxidation. In conclusion, the presence of single Pd atoms on the Pd/CeO 2-nanorod, corroborated by aberration-corrected TEM and CO-FTIR spectroscopy, is considered pivotal to its high CO oxidation activity.
Authors:
 [1] ;  [1] ; ORCiD logo [1] ;  [2] ;  [2] ;  [2] ;  [2] ; ORCiD logo [1]
  1. Eindhoven Univ. of Technology, Eindhoven (The Netherlands)
  2. Univ. of New Mexico, Albuquerque, NM (United States)
Publication Date:
Grant/Contract Number:
FG02-05ER15712
Type:
Accepted Manuscript
Journal Name:
ACS Catalysis
Additional Journal Information:
Journal Volume: 7; Journal Issue: 10; Journal ID: ISSN 2155-5435
Publisher:
American Chemical Society (ACS)
Research Org:
The Netherlands Organization for Scientific Research (NWO) (The Netherlands)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; cerium oxide; CO oxidation; computational modeling; FTIR; mechanism; palladium; single site
OSTI Identifier:
1414915