Which mechanism limits the rate of hydrogen permeation through palladium membranes at elevated temperatures?

💡 Explanation

As temperature increases, hydrogen adsorption on the palladium surface becomes rate-limiting due to dissociation of H2 molecules, requiring specific surface sites, and this affects the entire permeation process. Therefore Surface adsorption mainly determines the hydrogen permeation rate at high temperatures, rather than bulk diffusion, desorption, or boundary effects acting alone.

• Which consequence results when intrinsic defects narrow bandgaps?
• Which outcome occurs from phonon scattering in a crystal?
• Which effect compromises Lidar accuracy during heavy rainfall?
• Which risk increases when injecting excess current into an electrochemical cell?
• Which outcome occurs when plane-polarized light exits sucrose solution?
• Which outcome occurs when a radio wave encounters a sudden increase in atmospheric electron density at the ionosphere?