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Polyfunctional Ni-containing catalysts supported on the B 2 O 3 -Al 2 O 3 and MoO 3 -Al 2 O 3 were prepared by a sequential impregnation. They were evaluated in ethylene conversion to C 5+ alkenes or propylene. The catalysts were characterized by X-ray diffraction, Fourier transformed infrared spectroscopy, Fourier transformed infrared spectroscopy of adsorbed CO, UV-VIS diffuse reflectance spectroscopy, temperature programmed reduction and temperature-programmed desorption of NH 3 . NiO/B 2 O 3 -Al 2 O 3 samples containing Ni 2+ cations chemically bonded to the acid support are the most effective catalysts for ethylene oligomerization. The NiO/MoO 3 -Al 2 O 3 catalyst activity in the ethylene conversion to propylene is related with the presence of ethylene dimerization active sites, i.e. Ni 2+ cations bonded to the support acidic sites, and active sites of metathesis in the form of monomolybdate species.
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Карпова et al. (2024) studied this question.
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