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.

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