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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 11
BKCSDE 26(11)
November 20, 2005 

NiSO4 Supported on FeO-promoted ZrO2 Catalyst for Ethylene Dimerization
Jong Rack Sohn*, Young Tae Kim, Dong Cheol Shin
FeO-promoted NiSO4 catalyst, Acid strength, Acidity, Ethylene dimerization
The NiSO4 supported on FeO-promoted ZrO2 catalysts were prepared by the impregnation method. FeOpromoted ZrO2 was prepared by the coprecipitation method using a mixed aqueous solution of zirconium oxychloride and iron nitrate solution followed by adding an aqueous ammonia solution. The addition of nickel sulfate (or FeO) to ZrO2 shifted the phase transition of ZrO2 (from amorphous to tetragonal) to higher temperatures because of the interaction between nickel sulfate (or FeO) and ZrO2. 10-NiSO4/5-FeO-ZrO2 containing 10 wt % NiSO4 and 5 mol % FeO, and calcined at 500 °C exhibited a maximum catalytic activity for ethylene dimerization. NiSO4/FeO-ZrO2 catalysts was very effective for ethylene dimerization even at room temperature, but FeO-ZrO2 without NiSO4 did not exhibit any catalytic activity at all. The catalytic activities were correlated with the acidity of catalysts measured by the ammonia chemisorption method. The addition of FeO up to 5 mol % enhanced the acidity, surface area, thermal property, and catalytic activities of catalysts gradually, due to the interaction between FeO and ZrO2 and due to consequent formation of Fe-O-Zr bond.
1749 - 1756
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