There are presented studies of Pd/Al2O3 supported catalysts carried ou
t by temperature-programmed desorption of hydrogen (TPD) and X-ray dif
fraction (XRD). The relatively good mutual agreement of palladium crys
talites sizes determined by these methods has been found. It is possib
le to determine palladium dispersion by chemisorption measurements in
spite of the strong metal support interaction phenomena and hydrogen s
pillover effect.