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单词 Langmuir adsorption equation
释义

Langmuir adsorption equation

英语百科

Langmuir adsorption model

Fig 1. A schematic showing equivalent sites, occupied (blue) and unoccupied (red) clarifying the basic assumptions used in the model. The adsorption sites (heavy dots) are equivalent and can have unit occupancy. Also, the adsorbates are immobile on the surface.
An example plot of the surface coverage θA = P/(P+P0) with respect to the partial pressure of the adsorbate. P0 = 100mtorr. The graph shows levelling off of the surface coverage at pressures higher than P0.
Brunauer's model of multilayer adsorption, that is, a random distribution of sites covered by one, two, three, etc., adsorbate molecules.

The Langmuir adsorption model explains adsorption by assuming an adsorbate behaves as an ideal gas at isothermal conditions. At these conditions the adsorbate's partial pressure, p_A, is related to the volume of it, V, adsorbed onto a solid adsorbent. The adsorbent, as indicated in Figure 1, is assumed to be an ideal solid surface composed of series of distinct sites capable of binding the adsorbate. The adsorbate binding is treated as a chemical reaction between the adsorbate molecule A_{g} and an empty site, S. This reaction yields an adsorbed complex A_{ad} with an associated equilibrium constant K_{eq}

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更新时间:2025/6/20 12:52:03