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  Supported Ag Nanoparticles and Clusters for CO Oxidation: Size Effects and Influence of the Silver–Oxygen Interactions

Lamoth, M., Plodinec, M., Scharfenberg, L., Wrabetz, S., Girgsdies, F., Jones, T., et al. (2019). Supported Ag Nanoparticles and Clusters for CO Oxidation: Size Effects and Influence of the Silver–Oxygen Interactions. ACS Applied Nano Materials, 2(5), 2909-2920. doi:10.1021/acsanm.9b00344.

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 Creators:
Lamoth, Maximilian1, Author              
Plodinec, Milivoj1, 2, Author              
Scharfenberg, Ludwig3, Author
Wrabetz, Sabine1, Author              
Girgsdies, Frank1, Author              
Jones, Travis1, Author              
Rosowski, Frank4, 5, Author
Horn, Raimund3, Author
Schlögl, Robert1, 6, Author              
Frei, Elias1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Division of Materials Physics, Rudjer Boskovic Institute, 10001 Zagreb, Croatia, ou_persistent22              
3Technische Universtität Hamburg, ou_persistent22              
4BasCat—UniCat BASF Joint Lab, Technical University Berlin, 10623 Berlin, Germany, ou_persistent22              
5Process Research and Chemical Engineering, Process Catalysis Research, BASF SE, 67056 Ludwigshafen, Germany, ou_persistent22              
6Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion , Stiftstr. 34 - 36 45470 Mülheim an der Ruhr, Germany, ou_persistent13              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2019-02-262019-04-102019-04-10
 Publication Status: Published online
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acsanm.9b00344
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Title: ACS Applied Nano Materials
  Abbreviation : ACS Appl. Nano Mater.
Source Genre: Journal
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Publ. Info: Washington, D.C., USA : American Chemical Society
Pages: 12 Volume / Issue: 2 (5) Sequence Number: - Start / End Page: 2909 - 2920 Identifier: ISSN: 2574-0970
CoNE: https://pure.mpg.de/cone/journals/resource/xx