Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Preparation and Characterization of Chromium Oxide Supported on Zirconia

  • Sohn Jong Rack (Department of Industrial Chemistry, Kyungpook National University) ;
  • Ryu, Sam Gon (Department of Industrial Chemistry, Kyungpook National University) ;
  • Park Man Young (Department of Industrial Chemistry, Kyungpook National University) ;
  • Pae Yeong Il (Department of Industrial Chemistry, National Science College Ulsan University)
  • Published : 1992.12.20
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Abstract

Chromium oxide/zirconia catalysts were prepared by dry impregnation of powdered $Zr(OH)_4$ with ($NH_4$)$_2$CrO$_4$aqueous solution. The characterization of prepared catalysts was performed using FTIR, XPS, XRD and DTA methods, and by the measurement of surface area. The addition of chromium oxide to zirconia shifted the transitions of $ZrO_2$ from amorphous to tetragonal phase and from tetragonal to monoclinic phase to higher temperature due to the strong interaction between chromium oxide and zirconia, and the specific surface area of catalysts increased in proportion to the chromium oxide content. Since the $ZrO_2$ stabilizes supported chromium oxide, chromium oxide was well dispersed on the surface of zirconia, and ${\alpha}$-$Cr_2O_3$ was observed only at the calcination temperature above 1173 K. Upon the addition of only small amount of chromium oxide (1 wt% Cr) to $ZrO_2$, both the acidity and acid strength of catalyst increased remarkably, showing the presence of two kinds of acid sites on the surface of $CrO_x$/$ZrO_4$-Bronsted and Lewis.

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Cited by

  1. ChemInform Abstract: Preparation and Characterization of Chromium Oxide Supported on Zirconia. vol.24, pp.18, 1992, https://doi.org/10.1002/chin.199318025