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      in situ X-ray Absorption Spectroscopic Analysis of Gold-Palladium Bimetallic Nanoparticle Catalysts

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      In-Situ Paper_revised2_final_nohilights.docx (2.109Mb)
      Date
      2013
      Author
      MacLennan, Aimee
      Banerjee, Abhinandan
      Hu, Yongfeng
      Miller, Jeffrey T
      Scott, Robert WJ
      Publisher
      American Chemical Society
      Type
      Article
      Peer Reviewed Status
      Peer Reviewed
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      Abstract
      Gold–palladium core–shell nanoparticles have been previously shown to be extremely effective catalysts for a number of oxidation reactions including the aerobic oxidation of alcohols. However, the novel activity and durability of such catalysts are still poorly understood, and there are several putative mechanisms by which oxidation reactions can proceed. Previously we showed that Pd(II) salts in the presence of Au nanoparticles were also effective catalysts for the room temperature oxidation of crotyl alcohol. Herein we show an in situ X-ray absorption spectroscopy (XAS) study at both the Pd–K and Pd-LIII edges of Au nanoparticle/Pd(II) salt solutions in the presence of crotyl alcohol. Liquid cells with X-ray permeable windows were used to obtain quick-scan XAS data during the oxidation of crotyl alcohol, allowing for time-resolved Pd speciation information and information about the reaction mechanism and kinetics. XAS measurements definitively show that the first step of this reaction involves Pd reduction onto the Au nanoparticles; in addition, further studies of the stability of the resulting Au–Pd core–shell nanoparticles toward oxygen gas suggests that the role of Au in such catalysts is to prevent the reoxidation of the catalytically active surface Pd atoms. Catalytic crotyl alcohol oxidation measurements were done which validated that the in situ reduction of Pd(II) in the presence of Au nanoparticles did indeed result in catalytically active AuPd bimetallic catalysts.
      Citation
      A. MacLennan, A. Banerjee, Y. Hu, J. T. Miller, R. W. J. Scott ACS Catalysis, 2013, 3, 1411–1419.
      URI
      http://hdl.handle.net/10388/11538
      DOI
      10.1021/cs400230t
      Subject
      Bimetallic
      X-ray absorption spectroscopy
      In situ
      Catalysis
      Oxidation
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