[kem-uh-sawrp-shuhn, -zawrp-]
noun Chemistry.
adsorption involving a chemical linkage between the adsorbent and the adsorbate.

1930–35; chemi- + (ad)sorption Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chemisorption (ˌkɛmɪˈsɔːpʃən)
an adsorption process in which an adsorbate is held on the surface of an adsorbent by chemical bonds

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The rate limiting process for the kinetics of the anode reaction is the chemisorption of hydrogen onto active catalyst sites'.
Sorption mechanisms are generally categorized as either physical adsorption, chemisorption, or electrostatic adsorption.
Sorbents use one of two mechanisms for capturing and controlling gas-phase air contaminants-physical adsorption and chemisorption.
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