CATALLETT 85-2003-109

Effects of Na addition, pyridine preadsorption, and water
preadsorption on the hydrogen adsorption property of Pt/SO2
4 –ZrO2

Hydrogen adsorption was studied for Pt/SO2
4 –ZrO2 samples modified with Na addition, pyridine preadsorption, and water
preadsorption to elucidate the relation between the rate and capacity of hydrogen adsorption and the surface state. The surface states
were monitored by XRD, IR, ammonia TPD, and measurement of catalytic activity for cyclohexane isomerization. All the modifications
suppressed the hydrogen uptake. It was suggested that Lewis acid sites promote the hydrogen uptake by stabilizing spiltover hydrogen atoms.