Collect. Czech. Chem. Commun. 1992, 57, 1793-1797

Enthalpy of Hydrogen Absorption in Palladium Deposited on Al2O3 and TiO2 Supports

Ivo Paseka

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6


The potentials of the Pd/TiO2 and Pd/Al2O3 catalysts were measured during saturation with hydrogen and during oxidation of the absorbed hydrogen with Ce(IV) in the medium of 0.5M-H2SO4. From the potential values attained in the coexistence region of the α- and β-hydride phases the enthalpy of hydrogen absorption, ∆Hab in Pd deposited on various supports was evaluated. With standard supports Degussa, ∆Hab approaches the value measured on Pt black; a marked decrease of the absorption enthalpy was observed on the support TiO2 of domestic provenience.