Journal of Industrial and Engineering Chemistry, Vol.6, No.5, 297-304, September, 2000
Characterization of Nickel Sulfate Supported on Zirconia and Its Acidic Properties
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Nickel sulfate supported on zirconia catalysts was prepared by drying the powdered Zr(OH)4 with aqueous solution of nickel sulfate followed by calcining in air at a high temperature. The characterization of the prepared catalysts was performed using Fourier transform infrared (FTIR), X-ray diffraction (XRD), temperature programmed desorption (TPD), differential scanning calorimetry (DSC), and by the measurement of the surface area. The addition of nickel sulfate to zirconia shifted the phase transition of ZrO2 from amorphous to tetragonal to a higher temperature due to the interaction between nickel sulfate and zirconia, plus the specific surface area and acidity of the catalysts increased in proportion to nickel sulfate content up to 15 wt% of NiSO4. On the basis of the XRD, DSC, surface area, and acidity results it was determined that the nickel sulfate monolayer content that covered most of the available zirconia was estimated to be 15 wt% both of NiSO4. The infrared spectra of the adsorbed ammonia on NiSO4/ZrO2 showed the presence of both Bronsted and Lewis acid sites on the NiSO4/ZrO2 surface.
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