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Title: Correlation between the size and the magnetic properties of Ag2+ clusters loaded on ceria surface and their catalytic performance in the total oxidation of propylene. EPR study
Authors: Hany, Sara
Skaf, Mira
Aouad, Samer 
Gennequin, Cédric
Labaki, Madona
Abi Aad, Edmond
AbouKais, Antoine
Affiliations: Department of Chemistry 
Keywords: EPR
Redox properties
Catalytic activity
Issue Date: 2018
Part of: Journal of chemical physics
Volume: 502
Start page: 1
End page: 5
Three different types of Ag2+ ions ("a", "b", and "c") have been identified and examined by electron paramagnetic resonance (EPR) on 10% wt Ag/CeO2 prepared by impregnation method. One of them, Ag2+(b), behaves differently than the two others, Ag2+(a) and Ag2+(c), under redox atmospheres. The fact that, in reducing conditions (vacuum, propylene, hydrogen, and carbon black), Ag2+(a) and Ag2+(c) species were more easily reduced than Ag2+(b) ones, could not explain the catalytic performance and stability of this latter species compared to the first ones in the reaction of total oxidation of propylene. The EPR technique evidenced that Ag2+(b) species form, upon propene oxidation, a cluster. This cluster is composed of two parallel electron spins (dimer) and three nuclear spins (trimer). It seems that before propylene oxidation, Ag2+(b) clusters were ferromagnetic. This ferromagnetic character of Ag2+(b) species may explain their better catalytic performance, in propylene oxidation, than those of Ag2+(a) and Ag2+(c) ones.
DOI: 10.1016/j.chemphys.2018.01.001
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Chemistry

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