Permeance inhibition of Pd-based membranes by competitive adsorption of CO: Membrane size effects and first principles predictions
Many studies have demonstrated an inhibition of hydrogen permeance through a Pd or Pd-alloy membrane due to competitive adsorption of CO, ammonia and other species. Several corrections to Sieverts’ law were suggested to account for these effects, based on a Langmuir isotherm, but they all suffer from certain drawbacks as detailed below. We derive a new correction, based on the kinetic balances on the adsorbed layer, and on the underlying dissolved H layer from which the diffusing H atoms originate.