Effect of Pd–TiO2 interaction on the enthalpy of hydrogen absorption

Abstract

The uptake of hydrogen (chemisorption and absorption) by palladium supported on titania has been measured volumetrically at various temperatures. On increasing the hydrogen pressure, α-phase palladium hydride absorbed hydrogen and transformed into β-phase. The transition pressure increased with the measuring temperature. The enthalpy of the transition was decreased by increasing the temperature for reduction pretreatment. These variations are attributed to electronic interactions between the metallic palladium and the reduced support (TiO_x).