Effect of surface modification on adsorption properties of metal surfaces

Abstract

Using a two-dimensional model of election gas-adsorbate particle interaction, energy of physical adsorption and chemisorption dependence on modifying adsorbate coverage is described. Expenmental study of physical adsorption of argon on Pd and Ag surfaces at- -196" C shows that preadsorption of oxygen increases adsorption capacity of uncovered part of the metal surface, which is in agreement with the theory_ A study ofthennal desorption of CO and H20 from Ag surface and nitrogen and H)O from Pd surface show an increase In activation energy desorption of these gases from modified surfaces.