Effect of chemical composition and method of preparation of the physico – chemical properties of NiO/B2O3–Al2O3 and its catalytic activity in the ethylene oligomerization

Investigation of the influence of the chemical composition of support, substance and the method of nickel fixing on the physico-chemical and catalytic properties of the NiO/B2O3–Al2O3 system was conducted. Boron oxide content in the support was varied from 2 to 30 wt.% and a nickel content from 0,59 up to 3,18 wt.%. Catalyst samples were studied by X-ray phase analysis, thermoprogrammed desorption of ammonia, IR spectroscopy, including the adsorbed CO, as well as electronic diffuse reflectance spectroscopy. Tests of catalysts were carried out in the ethylene oligomerization in a flow reactor with a fixed catalyst bed at a temperature of 200 °С, pressure of 1 MPa, and a mass flow rate of ethylene of 0,5 hr–1. A gaseous mixture of ethylene-methane with ethylene content 30 wt.% was used as feed. The assumption was made that activity of NiO/B2O3–Al2O3 system in ethylene oligomerization process is associated with the formation of octahedral configuration Ni2+ cations surrounded by borate anions on the surface of the catalyst system. The most active catalysts containing 3,2 wt.% Ni and 10–20 wt.% B2O3 in the composition of the support. Method of preparation (adsorption binding or impregnation) had a little effect on the state of nickel in NiO/B2O3–Al2O3 system samples and their catalytic properties. The resulting catalysts are characterized by simplicity of preparation, low cost and availability of feed in comparison with the known ones.

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