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Title: Influence of Coordination Environment of Anchored Single-Site Cobalt Catalyst on CO2 Hydrogenation

Journal Article · · ChemCatChem
 [1];  [1];  [1];  [2];  [3]; ORCiD logo [1]
  1. Univ. of South Carolina, Columbia, SC (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States); Illinois Institute of Technology, Chicago, IL (United States). Center for Synchrotron Research and Instrumentation

Heterogeneous catalysts generally have a variety of active-site structures due to the innate heterogeneity of the surface,resulting in complicated correlations between activity and active-site structure. Single site heterogeneous cobalt catalysts with a uniform catalytic surface were utilized as a platform to probe surface sensitive reactions; in this case CO2 hydrogenation. It was found that atomically isolated cobalt single sites, which exist solely in the tetrahedral Co2+ coordination, exclusively form CO under typical CO2 methanation conditions,while cobalt clusters yielded the highest rate of CO2 reactionand began to form methane. Utilizing the principles of Ostwald Ripening to probe the ensemble effects for CO2 hydrogenation, the transition from atomic isolation to small clusters of atoms to nanoparticles was explored. Furthermore, the chemical structure of the cobalt was elucidated primarily via X-Ray Absorption Spectroscopy (XANES/EXAFS) and X-Ray Photoelectron Spectroscopy (XPS).

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1763652
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 3 Vol. 12; ISSN 1867-3880
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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