Adsorption Preferential concentration of ADSORBATE molecules close to surface of the ADSORBENT –Physical adsorption Very fast non activated process (E ads  0) Involves weak interaction (van der waal forces) between adsorbent and adsorbate ΔH≤ 10 kcal/mol –Chemical adsorption or Chemisorption Can be activated (E ads ) Involves valence forces.
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