Characterization of Supported NiSO4 and Effect of TiO2–ZrO2 Composition on Catalytic Activity for Acid Catalysis |
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Authors: | Jong Rack Sohn Si Hoon Lee |
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Affiliation: | (1) Department of Applied Chemistry, Engineering College, Kyungpook National University, Taegu, 702-701, Korea;(2) Environment Research Team, Research Institute of Industrial Science and Technology, Pohang, 790-330, Korea |
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Abstract: | A series of catalysts, NiSO4/TiO2–ZrO2 having different TiO2–ZrO2 composition, for acid catalysis was prepared by the impregnation method using an aqueous solution of nickel sulfate. The
addition of TiO2 to ZrO2 improved the surface area of the catalyst and enhanced its acidity remarkably because of the formation of new acid sites
through the charge imbalance of Ti–O–Zr bonding. The binary oxide, TiO2–ZrO2 calcined above 600 °C resulted in the formation of crystalline orthorhombic phase of ZrTiO4. Therefore, NiSO4/TiO2–ZrO2 calcined at 500 °C exhibited a maximum catalytic activity for acid catalysis, and then the catalytic activity decreased with
the calcination temperature. The correlation between catalytic activity and acidity held for both reaction, 2-propanol dehydration
and cumene dealkylation. NiSO4 supported on 50TiO2–50ZrO2 (TiO2/ZrO2 ratio = 1) among TiO2–ZrO2 binary oxides exhibited the highest catalytic activity for acid catalysis. |
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Keywords: | NiSO4/TiO2– ZrO2 Acidity TiO2– ZrO2 composition ZrTiO4 phase Cumene dealkylation 2-Propanol dehydration |
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