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- W874214892 abstract "A series of catalysts, NiO/CeO 2 -ZrO 2 /WO 3 , for ethylene dimerization was prepared by the precipitation and impregnation methods. For NiO/CeO 2 -ZrO 2 /WO 3 sample, no diffraction line of nickel oxide was observed up to 40wt%, indicating good dispersion of nickel oxide on the surface of catalyst. The hexagonal and monoclinic phases of WO 3 up to the calcination temperature of 500 °C were observed, whereas the hexagonal phase of WO 3 completely was transformed into monoclinic phase of WO 3 at 600 °C and above. The role of CeO 2 in the catalysts was to form a thermally stable solid solution with zirconia and consequently to give high surface area and acidity. The catalytic activities for ethylene dimerization were correlated with the acidity of catalysts measured by the ammonia chemisorption method. 25-NiO/5-CeO 2 -ZrO 2 /l 5-W03 containing 25 wt% NiO, 15 wt% WO 3 and 5 mol% CeO 2 , and calcined at 400 °C exhibited a maximum catalytic activity due to the effects of WO 3 modifying and CeO 2 doping." @default.
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- W874214892 date "2005-05-20" @default.
- W874214892 modified "2023-09-23" @default.
- W874214892 title "Preparation and Characterization of NiO/CeO2-ZrO2/WO3Catalyst for Ethylene Dimerization: Effect of CeO2Doping and WO3Modifying on Catalytic Activity" @default.
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- W874214892 doi "https://doi.org/10.5012/bkcs.2005.26.5.755" @default.
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