Influence of palladium state on the efficiency of hexane isomerization catalysts

In this work, the catalytic properties of palladium catalysts based on Al 2 O 3 , SiO 2 , their mechanical mixtures with SO 4 -ZrO 2 and the Pd/SO 4 -ZrO 2 -Al 2 O 3 catalyst in the hexane isomerization reaction were studied. The catalysts were characterized by low-temperature nitrogen adsorption, X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, IR spectroscopy of adsorbed CO, and XPS. It has been shown that the nature of the palladium support and precursor influences the size and charge state of palladium particles in catalysts. It has been established that the most active in the hexane isomerization reaction are catalytic systems in which positively charged forms of palladium are present.