Abstract

Samples of SO4/ZrO2/Al2O3 and Pt/Al2O3 catalysts and their physical mixtures are prepared, the catalytic properties of the samples in the isomerization reaction of n-hexane were studied. Significant impact on the state of the platinum on catalytic properties of the samples was revealed. It is shown that the ionic form of platinum present in the reduced form of catalysts by infrared spectroscopy (COads) and oxygen chemisorption of oxygen-hydrogen titration. These forms can adsorb up to three hydrogen atoms on each surface atom of platinum. It’s established with the help of isotope H/D-exchange that specific properties of ionic platinum are manifested in the formation of hydride form of adsorbed hydrogen. It is suggested that the activity and stability of catalysts based on sulfated zirconia in the isomerization of n-hexane caused by involving ionic and metallic platinum in hydrogen activation. The results can be used to develop the effective catalysts for С5–С6 gasoline fractions isomerization to produce isomerate as octane additives in modern gasoline.

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