Optimization of the Composition of Pt/B2O3–Al2O3 Catalyst for Hydroisomerization of Benzene–Containing Fractions
Chemistry for Sustainable Development
Institute of Hydrocarbons Processing SB RAS
The possibility to use available and easily synthesized borate-containing aluminium oxide as an acidic support for the catalyst of hydroisomerization of benzene-containing gasoline fractions was demonstrated for the first time. The phase composition, texture characteristics and acid properties of B2O3–Al2O3 systems with boron oxide content 0.9–39.0 mass %, obtained by mixing pseudo-boehmite with solid ortho–boric acid followed by annealing at a temperature of 600 °C were studied. For hydroisomerization of the model mixture of n-heptane with benzene it was shown that the most efficient sample is Pt/B2O3–Al2O3 with the support containing 27.5 mass % of boron oxide. This catalyst provides almost complete benzene hydrogenation and the maximal yield of methylcyclopentane (12.1 mass %) and isoheptanes (43.5 mass %) at a temperature of 350 °C. Higher selectivity of isomerization reactions in this case is connected with the smaller amount of strong acid centres on the catalyst surface.