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      Spectroscopic characterization of gold supported on tungstated zirconia

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      Author
      Kantcheva, M.
      Milanova, M.
      Avramova, I.
      Mametsheripov, S.
      Date
      2012
      Source Title
      Catalysis Today
      Print ISSN
      0920-5861
      Electronic ISSN
      1873-4308
      Publisher
      Elsevier
      Volume
      187
      Issue
      1
      Pages
      39 - 47
      Language
      English
      Type
      Article
      Item Usage Stats
      119
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      94
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      Abstract
      Gold catalysts supported on tungstated zirconia (containing 5–20 wt% WO3) are prepared by cationic adsorption from aqueous solution of [Au(en)2]Cl3 complex. The materials are characterized by XRD, DRUV–vis spectroscopy and XPS. The nature of the deposited gold species is studied by FT-IR spectroscopy of adsorbed CO. It is concluded that the gold particles occupy preferentially the WOx-free zirconia surface and the dispersion of gold depends on the amount of coodinatively unsaturated (cus) Zr4+ ions. Modification of zirconia by tungsten increases the gold uptake but at the same time causes decrease in the concentration of (cus) Zr4+ ions thus lowering the dispersion of gold clusters. According to the results of in situ FT-IR spectroscopy, the Au/WOx ZrO2 catalysts display higher activity in the CO oxidation in the low-temperature range (up to 150 ◦C) than the WOx-free Au/ZrO2 sample. The low-temperature activity of the W-containing catalysts could be associated with decreased basicity of the support oxide ions resulting in reduced accumulation of stable carbonate species.
      Keywords
      DR-UV-vis spectroscopy
      Gold supported on tungstated zirconia
      In situ FT-IR spectroscopy of adsorbed CO
      XPS
      XRD
      CO + O 2
      Permalink
      http://hdl.handle.net/11693/21422
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.cattod.2012.02.027
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