Effect of Dispersed MoO3 Amount on Catalytic Activity of NiO-ZrO2 Modified with MoO3 for Acid Catalysis

Abstract

NiO supported on zirconia modified with for acid catalysis was prepared by drying powdered 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. equal to or less than 15 wt% was dispersed on the surface of catalyst as two-dimensional polymolybdate or monomolybdate, while for above 15 wt%, crystalline orthorhombic phase of was formed, showing that the critical dispersion capacity of on the surface of catalyst is 0.18 g/g NiO- on the basis of XRD analysis. Acidity and catalytic activities for acid catalysis increased with the amount of dispersed . The high acid strength and acidity was responsible for the Mo=O bond nature of the complex formed by the interaction between and . The catalytic activity for acid catalysis was correlated with the acidity of the catalysts measured by the ammonia chemisorption method.