Effect of chemical composition and method of preparation on the physicochemical properties of the NiO/B2O3-Al2O3 system and its catalytic activity in ethylene oligomerization

The effect the chemical composition of a support, the content of nickel, and the method of its binding has on the physicochemical and catalytic properties of the NiO/B 2 O 3 -Al 2 O 3 system is studied. The boron oxide content in the support is varied from 2 to 30 wt %, while the nickel concentratio...

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Bibliographic Details
Published in:Catalysis in industry 2014-04, Vol.6 (2), p.105-113
Main Authors: Karpova, T. R., Lavrenov, A. V., Buluchevskii, E. A., Gulyaeva, T. I., Buyal’skaya, K. S., Shilova, A. V., Leontieva, N. N., Arbuzov, A. B., Drozdov, V. A.
Format: Article
Language:English
Subjects:
Catalysis
Catalysis in Chemical and Petrochemical Industry
Chemistry
Chemistry and Materials Science
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Summary:The effect the chemical composition of a support, the content of nickel, and the method of its binding has on the physicochemical and catalytic properties of the NiO/B 2 O 3 -Al 2 O 3 system is studied. The boron oxide content in the support is varied from 2 to 30 wt %, while the nickel concentration is 0.59–3.18 wt %. The catalyst samples are studied via X-ray diffraction analysis, temperature-programmed desorption of ammonia, IR spectroscopy (including that of adsorbed CO), and UV-VIS diffuse reflectance spectroscopy. Tests of the catalysts in ethylene oligomerization are conducted in a fixed-bed flow reactor at a temperature of 200°C, a pressure of 1 MPa, and a space velocity of ethylene of 0.5 h −1 . The feedstock is an ethylene-methane gas mixture containing 30 wt % of ethylene. It is suggested that the activity of the NiO/B 2 O 3 -Al 2 O 3 system in ethylene oligomerization can be attributed to the formation of octahedral Ni 2+ cations environed by borate anions on the surface of the system. The most active catalysts contain 2–3 wt % Ni and 10–20 wt % B 2 O 3 in the supports. The method of preparation (adsorption binding or impregnation) has little effect on the state of nickel in the NiO/B 2 O 3 -Al 2 O 3 system samples and their catalytic properties. The prepared catalysts are characterized by the ease of preparation, availability, and a low cost of the initial materials, as compared to known catalysts.
ISSN:2070-0504
2070-0555
DOI:10.1134/S2070050414020044