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http://dx.doi.org/10.5012/bkcs.2006.27.10.1623

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)
Publication Information
Bulletin of the Korean Chemical Society / v.27, no.10, 2006 , pp. 1623-1632 More about this Journal
Abstract
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.
Keywords
$NiO-ZrO_2/MoO_3$ catalyst; $MoO_3$ dispersion; Acid catalysis; 2-Propanol dehydration; Cumene dealkylation;
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