Adsorption–desorption cycles of some vapours and gases (water, ammonia, hydrogen, oxygen) on polycrystalline cadmium sulphide have been performed at 305 K by microcalorimetric means. Hydrogen and ammonia show the strongest interaction energy and the highest fraction of an irreversibly adsorbed phase. Water and oxygen exhibit weak and reversible adsorption. Various TPD measurements confirm this relative bonding order for these adsorbates.
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