Acid Surface Sites of B2O3-Al2O3 and NiO/B2O3-Al2O3 Catalysts for Light Olefins Oligomerization by the ESR Spin Probe Method
V. L. YURPALOV1, V. A. DROZDOV1,2, T. R. KAPROVA1, and A. V. LAVRENOV1
1Institute of Hydrocarbons Processing, Siberian Branch, Russian Academy of Sciences, Omsk, Russia
2Omsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Omsk, Russia
Keywords: borate-containing aluminium oxide, Solid State NMR, Bronsted acid sites
Pages: 107-113
Abstract
The study results of acidity in a series of borate-containing aluminium oxide with the B2O3 content from 2.0 to 31.4 mass % (butenes oligomerisation catalyst) and a nickel-containing ethane oligomerisation catalyst obtained on its base were presented using the ESR spin probe method. The correlations between catalytic properties and the amount of nickel adsorbed with the concentration of Brønsted acid sites (BAS) determined using the probe molecules perylene were found: an increase in the concentration of BAS determinable with perylene in systems leads to a rise in the butenes conversion degree, the yield of oligomerisation products, and also to an increase in the amount of nickel adsorbed.
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