Heats of adsorption of H₂and CO on a Pd/TiO₂‘S.M.S.I.’(strong metal–support interaction) catalyst

Abstract

CO and H2 heats of adsorption on Pd/Ti02 are comparable to or higher than those for typical Pd catalysts indicating that suppressed chemisorption capacity in the strong metal-support interaction state is not because of weakened adsorbate-metal bonds.We report here what we believe to be the first measurement of heats of adsorption on a catalyst after it is in the 'S.M.S.I.' state, which is obtained after a high temperature reduction in

Influence of dispersion on the energies of adsorption: H2, CO, propylene and propyne on supported Pd or Pt

“…on Pd films: 84 to 147 kJ.mo1-1 for H 2 and 105 to 167 kJ.mol-1 for CO[4]. A support (graphite) different from ours may explain the difference, altl~ough Vannice et al[7] seem to show, also from calorimetric measurements (but rapid and non isothermal, being of the DSC type) that the adsorption enthalpy of CO on Pd is practically the same whatever the support (Sit z, A120 3, TiO2). A support (graphite) different from ours may explain the difference, altl~ough Vannice et al[7] seem to show, also from calorimetric measurements (but rapid and non isothermal, being of the DSC type) that the adsorption enthalpy of CO on Pd is practically the same whatever the support (Sit z, A120 3, TiO2).…”