Co-Conversion of n-Hexane and n-Butane on Zirconium-Zeolite Catalysts

To create a catalytic system for low-temperature isomerization of a mixture of normal and low-branched alkanes, conversion of n-butane, n-hexane and their mixture (mole ratio 1:1) was studied using a catalytic system Ni/MOR-SO4 2–/ZrO2 and its components. It was shown that the combination of properties of Ni/MOR and SO4 2–/ZrO2 can decrease the temperature of the isomerizing catalyst below 150 °C. The combined isomerization of n-butane and n-hexane provides an increase in the conversion of n-butane with the formation of isopentane and a decrease in the conversion of n-hexane as compared with the conversions obtained during their separate transformation. Thus, the combined isomerization can increase the octane number of straight-run gasoline fractions as a result of averaging their molecular weight because of the accumulation of isopentane.

n-butane, n-hexane, isomerization, mordenite, sulfated zirconia, bimolecular mechanism

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