Title: mobile adsorption
Long Title: IUPAC Gold Book - mobile adsorption
DOI: 10.1351/goldbook.M03951
Status: current

Definition
A situation in which molecules of adsorbate are free to move about the surface. Mobility of the adsorbate will increase with temperature and mobile adsorption may be either localized or non-localized. In localized mobile adsorption the adsorbate spends most of the time on the adsorption sites but can migrate or be desorbed and readsorbed elsewhere. In non-localized adsorption the mobility is so great that a small fraction of the adsorbed species is on the desorption sites and a large fraction at other positions on the surface.

Related Terms
- Mobility: https://goldbook.iupac.org//terms/view/M03955
- adsorbate: https://goldbook.iupac.org//terms/view/A00152
- desorption: https://goldbook.iupac.org//terms/view/D01620
- immobile adsorption: https://goldbook.iupac.org//terms/view/I02971

Source
- PAC, 1976, 46, 71. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units - Appendix II. Definitions, Terminology and Symbols in Colloid and Surface Chemistry. Part II: Heterogeneous Catalysis' on page 76 (https://doi.org/10.1351/pac197646010071)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/M03951/html
- json: https://goldbook.iupac.org/terms/view/M03951/json
- xml: https://goldbook.iupac.org/terms/view/M03951/xml

Citation: Citation: 'mobile adsorption' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.M03951
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Accessed: 2025-11-14T19:36:43+00:00