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      Gold supported on ceria doped by Me3+ (Me = Al and Sm) for water gas shift reaction: Influence of dopant and preparation method

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      Author
      Andreeva, D.
      Kantcheva, M.
      Ivanov, I.
      Ilieva, L.
      Sobczak, J. W.
      Lisowski, W.
      Date
      2010
      Source Title
      Catalysis Today
      Print ISSN
      0920-5861
      Electronic ISSN
      1873-4308
      Volume
      158
      Issue
      1-2
      Pages
      69 - 77
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Gold catalysts supported on ceria doped by Sm and Al were studied. The influence of the preparation method, as well as the nature of dopants on the structure, properties and WGS activity are investigated. The applied methods of preparation cause the modification of ceria in a different extent. In the sample prepared by co-precipitation (CP) and doped by Al, the vacancies are located within the bulk of ceria structure, whereas in the corresponding AuCeSmCP sample the vacancies are located most likely around Sm and the ceria structure seems to be better ordered than the Al doped ceria. There is no distinct correlation between the reducibility and WGS activity of the studied catalysts. The Au 4f XPS spectra of fresh samples reveal higher contribution of dispersed form of Au for Sm doped catalysts than for the corresponding Al doped samples. The Ce 3d XPS spectra disclose also a higher concentration of Ce3+ evaluated before the catalytic operation for Sm doped catalysts as compared with the Al doped fresh samples. The observations by "in situ" FT-IR spectroscopy agree well with the model of active sites and the, mechanism of the WGS reaction proposed recently by some of us. The amount of formate species observed on the AuCeSmCP is higher than that on the AuCeAlCP catalyst and parallels the catalytic activity. The higher concentration of active sites on the surface of the AuCeSmCP catalyst facilitates the dissociation of water.
      Keywords
      Catalytic activity
      Preparation methods
      Sm and Al doped ceria
      WGS activity and mechanism
      Active site
      Al doped
      Ceria structure
      FTIR spectroscopy
      Gold catalysts
      In-situ
      Structure , properties
      Water gas shift reactions
      WGS reactions
      XPS spectra
      Aluminum
      Catalyst activity
      Cerium
      Cerium compounds
      Chemical shift
      Doping (additives)
      Gold
      X ray photoelectron spectroscopy
      Catalyst supports
      Permalink
      http://hdl.handle.net/11693/28424
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.cattod.2010.05.030
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