assumptions - isotherms and mechanisms

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Last updated 7:47 AM on 4/27/26
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7 Terms

1
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langmuir

monolayer

homogenous surface

constant adsorption energy

localized sites

single molecule per site

no neighbouring effect

2
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dissociative langmuir

diatomic molecule break apart upon adsorption

requires two adjacent vacant surface sites

monolayer

homogenous surface

no neighbouring effect

fixed total site density

3
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freundlich

multilayer

heterogenous surface

empirical

non-ideal adsorption

no saturation at high pressure

exponential heat distribution

4
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BET

multilayer

homogenous

layer formation

negligible lateral interactions

liquid-like layers

5
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eley-rideal

direct interaction

single site coverage

no competitive adsorption

homogenous surface

reaction product desorption

6
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unimolecular system

monolayer

homogenous surface

localised adsorption

no lateral interactions

equilibrium adsorption

single site occupancy

7
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langmuir-hinshelwood

monolayer

heterogenous surface

reversible adsorption

negligible interactions