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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 10
BKCSDE 27(10)
October 20, 2006

Title	Effect of Dispersed MoO₃ Amount on Catalytic Activity of NiO-ZrO₂ Modified with MoO₃ for Acid Catalysis
Author	Jong Rack Sohn*, Sung Gyu Lee, Dong Cheol Shin
Keywords	NiO-ZrO₂/MoO₃ catalyst, MoO₃ dispersion, Acid catalysis, 2-Propanol dehydration, Cumene dealkylation
Abstract	NiO supported on zirconia modified with MoO3 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. MoO₃ equal to or less than 15 wt% was dispersed on the surface of catalyst as two-dimensional polymolybdate or monomolybdate, while for MoO₃ above 15 wt%, crystalline orthorhombic phase of MoO₃ was formed, showing that the critical dispersion capacity of MoO₃ on the surface of catalyst is 0.18 g/g NiO-ZrO₂ on the basis of XRD analysis. Acidity and catalytic activities for acid catalysis increased with the amount of dispersed MoO3. The high acid strength and acidity was responsible for the Mo=O bond nature of the complex formed by the interaction between MoO₃ and ZrO₂. The catalytic activity for acid catalysis was correlated with the acidity of the catalysts measured by the ammonia chemisorption method.
Page	1623 - 1632
Full Text	PDF

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