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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 12
BKCSDE 27(12)
December 20, 2006

Title	CeO₂-Promoted Highly Active Catalyst, NiSO₄/CeO₂-ZrO₂ for Ethylene Dimerization
Author	Young Il Pae, Dong Cheol Shin, Jong Rack Sohn*
Keywords	NiSO₄/CeO₂-ZrO₂ catalyst, Promoting effect of CeO₂, Acidic properties, Ethylene dimerization
Abstract	The NiSO₄/CeO₂-ZrO₂ catalysts containing different nickel sulfate and CeO₂ contents were prepared by the impregnation method, where support, CeO₂-ZrO₂ was prepared by the coprecipitation method using a mixed aqueous solution of zirconium oxychloride and cerium nitrate solution followed by adding an aqueous ammonia solution. No diffraction line of nickel sulfate was observed up to 20 wt %, indicating good dispersion of nickel sulfate on the surface of CeO₂-ZrO₂. The addition of nickel sulfate (or CeO₂) to ZrO₂ shifted the phase transition of ZrO₂ from amorphous to tetragonal to higher temperatures because of the interaction between nickel sulfate (or CeO₂) and ZrO₂. A catalyst (10-NiSO₄/1-CeO₂-ZrO₂) containing 10 wt % NiSO₄ and 1 mole % CeO₂, and calcined at 600 °C exhibited a maximum catalytic activity for ethylene dimerization. The catalytic activities were correlated with the acidity of catalysts measured by the ammonia chemisorption method. The role of CeO₂ was to form a thermally stable solid solution with zirconia and consequently to give high surface area, thermal stability and acidity of the sample.
Page	1989 - 1996
Full Text	PDF

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