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

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 p...

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Bibliographic Details
Published in:ChemCatChem 2019-12, Vol.12 (3)
Main Authors: Jimenez, Juan D., Wen, Cun, Royko, Michael M., Kropf, Arthur J., Segre, Carlo, Lauterbach, Jochen
Format: Article
Language:English
Subjects:
CO2 hydrogenation
CO2 methanation
Cobalt
Cobalt single-site catalysts
Ensemble effects
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Ostwald Ripening
XAFS
XPS
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Summary: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).
ISSN:1867-3880
1867-3899