By Jozsef Toth
Bargains an outline of the hot theoretical and useful effects completed in gas-solid (G/S), liquid-solid (L/S), and gas-liquid (G/L) adsorption examine.
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Additional info for Adsorption Theory Modeling and Analysis Toth
11, (isotherms of Type III) Asr ðYÞ < 1 ð145Þ is valid in the whole domain of coverage; that is, Asr ðYÞ < Asid ð146Þ This means that the change in free energy of the surface is always less than that would have been caused by a two-dimensional ideal monolayer completed on a homogeneous surface. However, for isotherms of Type I and V (in Figs. 10 and 12, respectively), there always exists a deﬁnite coverage where Asr ðYÞ ¼ Asid ð147Þ The values of Y and Pr;m when Eq. (147) is valid are excellent and very simple parameters characterizing the adsorption system investigated.
9. The regions of coverages where cðYÞ > 1 and cðYÞ < 1 and the point where the proportional line drawn from the origin is a tangent can be seen. , the isotherm begins with a Henry section). The above analysis is also represented in Fig. 8. The ﬁrst ﬁgure ðwF ¼ 1Þ relates to the original FG equation, which can describe Types I and V and condensation isotherms. However, for Type V isotherms, the value of BF tends to inﬁnity when Y tends to 1. In this fact is also reﬂected the thermodynamical inconsistency of the original FG equation.
These values of y exist when the condition djðYÞ ¼0 dY ð132Þ is met. Let us differentiate Eq. (128) and calculate the values of BF for which Eq. (132) is fulﬁlled; we thus obtain wF ð133Þ BF ¼ YðwF À YÞ Equation (133) determines all values of BF at which two-dimensional condensation takes place. The coverages, Y, present in Eq. (133) are the places of minima and maxima mentioned earlier (see also the S-shape condensation isotherm in Fig. 7). The functions BF ðYÞ are shown in Fig. 8 by solid lines.