Bulletin of the Korean Chemical Society

  • 제27권10호
  • /
  • Pages.1623-1632
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  • 2006
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Effect of Dispersed MoO3 Amount on Catalytic Activity of NiO-ZrO2 Modified with MoO3 for Acid Catalysis

  • Sohn, Jong-Rack (Department of Applied Chemistry, Engineering College, Kyungpook National University) ;
  • Lee, Sung-Gyu (Department of Applied Chemistry, Engineering College, Kyungpook National University) ;
  • Shin, Dong-Cheol (Department of Applied Chemistry, Engineering College, Kyungpook National University)
  • 발행 : 2006.10.20
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초록

NiO supported on zirconia modified with $MoO_3$ for acid catalysis was prepared by drying powdered $Ni(OH)_2-Zr(OH)_4$ with ammonium heptamolybdate aqueous solution, followed by calcining in air at high temperature. The characterization of prepared catalysts was performed using FTIR, Raman, XRD, and DSC. $MoO_3$ equal to or less than 15 wt% was dispersed on the surface of catalyst as two-dimensional polymolybdate or monomolybdate, while for $MoO_3$ above 15 wt%, crystalline orthorhombic phase of $MoO_3$ was formed, showing that the critical dispersion capacity of $MoO_3$ on the surface of catalyst is 0.18 g/g NiO-$ZrO_2$ on the basis of XRD analysis. Acidity and catalytic activities for acid catalysis increased with the amount of dispersed $MoO_3$. The high acid strength and acidity was responsible for the Mo=O bond nature of the complex formed by the interaction between $MoO_3$ and $ZrO_2$. The catalytic activity for acid catalysis was correlated with the acidity of the catalysts measured by the ammonia chemisorption method.

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