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Characterization of Nickel Sulfate Supported on SiO2–Al2O3 for Ethylene Dimerization and Its Relationship to Acidic Properties

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Abstract

A series of catalysts, NiSO4/SiO2–Al2O3, for ethylene dimerization were prepared by the impregnation method using aqueous solution of nickel sulfate. Although SiO2–Al2O3 without NiSO4 was inactive as catalyst for ethylene dimerization, the SiO2–Al2O3 with NiSO4 exhibited high catalytic activity even at room temperature. The high catalytic activity of NiSO4/SiO2–Al2O3 was closely correlated with the increase of acidity and acid strength due to the addition of NiSO4. The sample having 15 wt% of NiSO4 and calcined at 500 °C for 1.5 h exhibited maxima for catalytic activity and acidity. In view of IR results of CO adsorbed on NiSO4/SiO2–Al2O3, it is concluded that the active sites responsible for ethylene dimerization consist of a low-valent nickel, Ni+, and an acid.

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Authors and Affiliations

  1. Department of Industrial Chemistry, Engineering College, Kyungpook National University, Taegu, 702-701, Korea

    Jong Rack Sohn & Won Cheon Park

  2. Korea Research Institute of Chemical Technology, Taejon, 305-606, Korea

    Sang-Eon Park

Authors
  1. Jong Rack Sohn
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  2. Won Cheon Park
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  3. Sang-Eon Park
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Sohn, J.R., Park, W.C. & Park, SE. Characterization of Nickel Sulfate Supported on SiO2–Al2O3 for Ethylene Dimerization and Its Relationship to Acidic Properties. Catalysis Letters 81, 259–264 (2002). https://doi.org/10.1023/A:1016549727905

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