Chemisorption

From Free net encyclopedia

Chemisorption is a type of adsorption whereby a molecule adheres to a surface through the formation of a chemical bond, as opposed to physisorption. It is characterised by:

  • High temperatures.
  • Type of interaction: strong; covalent bond between adsorbate and surface.
  • High enthalpy: <math>\Delta H \approx 400 KJ/mol</math>
  • Adsorption takes place only in a monolayer.
  • High activation energy
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Examples

Self Assembled Monolayers (SAMs) are often formed by chemisorbing thiols (RS-H) onto gold surfaces forming Au-SR bonds.

O2 on carbon at high temperatures

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See also

PhysisorptionTemplate:Chem-stub de:Chemisorption ru:Хемосорбция

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