The Collaborative International Dictionary of English v.0.48:

chemisorptive \chemisorptive\ chemosorptive \chemosorptive\adj.
   have the capacity to adsorb by chemical as contrasted with
   physical forces.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

chemisorptive
    adj 1: having the capacity to adsorb by chemical as contrasted
           with physical forces [syn: chemisorptive,
           chemosorptive]