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Publisher DOI: 10.1021/acsanm.9b00344
Title: Supported Ag nanoparticles and clusters for CO oxidation: size effects and influence of the silver-oxygen interactions
Language: English
Authors: Lamoth, Maximilian 
Plodinec, Milivoj 
Scharfenberg, Ludwig 
Wrabetz, Sabine 
Girgsdies, Frank 
Jones, Travis 
Rosowski, Frank 
Horn, Raimund 
Schlögl, Robert 
Frei, Elias 
Keywords: Ag nanoparticles/clusters;Ag-oxygen interaction;apparent Ag surface area, size effect;CO oxidation
Issue Date: 10-Apr-2019
Publisher: ACS Publications
Source: ACS Applied Nano Materials 5 (2): 2909-2920 (2019-05-24)
Journal or Series Name: ACS applied nano materials 
Abstract (english): Supported Ag catalysts on silica and corundum have been synthesized applying an improved impregnation technique. The resulting Ag particle sizes can be divided into three categories concerning: (I) bulk-like, (II) nanoparticles of 1-6 nm, and (III) in situ created Ag clusters below 1 nm. Ag nanoparticles and bulk-like Ag are investigated concerning their pretreatment dependence for CO oxidation showing that harsher pretreatment conditions need to be applied for smaller particle sizes, based on their tendency to form Ag2CO3. A particle size effect for Ag in oxidation reactions is investigated using CO oxidation as a test reaction. The CO oxidation performance is increasing with decreasing particle size with Ag clusters showing the highest activity. A novel method based on the adsorption of ethylene (C2H4) as sensor molecule is further used to discriminate the silver-oxygen (Ag-O) interaction strength of bulk-like Ag, Ag nanoparticles, and Ag clusters, showing a distinct Ag-O chemistry for the three individual particle size regimes. By application of C2H4 breakthrough curve measurements, the available Ag surface area is determined which enables a correlation of Ag surface area and CO oxidation rate. Correlations of Ag-O interaction strength, Ag surface area, and CO oxidation activity are discussed within the scope of this work.
DOI: 10.15480/882.2632
ISSN: 2574-0970
Institute: Chemische Reaktionstechnik V-2 
Type: (wissenschaftlicher) Artikel
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