Download Adsorption Theory Modeling and Analysis Toth by Jozsef Toth PDF

By Jozsef Toth

Deals an summary of the hot theoretical and useful effects accomplished in gas-solid (G/S), liquid-solid (L/S), and gas-liquid (G/L) adsorption learn.

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The values of parameters are as follows: KmB ¼ 0:75 Â 10À3 kPaÀ1 , wB ¼ 3:1, BB ¼ 1:70, Pm ¼ 186:7 kPa ð Á Á Þ; KmB ¼ 10À3 kPaÀ1 , wB ¼ 3:0, BB ¼ 1:60, Pm ¼ 166:4 kPa ð Þ; KmB ¼ 1:1 Â 10À3 kPaÀ1 , wB ¼ 3:2, BB ¼ 1:50, Pm ¼ 145:3 kPa ð Á Á Á Á Þ. , KL represents the Henry constant). At the modified Langmuir equation, P¼ 1 Y KmL wL À Y ð190Þ Interpretation of Adsorption Isotherms 39 FIG. 17 The uniform and thermodynamically consistent interpretation of the mBH isotherms of Type V. The values of parameters are as follows: KB ¼ 0:012 kPaÀ1 , wB ¼ 4:50, Pm !

Y expðÀBF YÞ wF À Y Y ðwT À Yt Þ1=t See Eq. (199). If t > 0, Bx ¼ BFT , and a ¼ 0 (heterogeneous surface, interactions, immobile layer), then we have the FT equation:     B Y ÀBF Yt exp P ¼ Pm ðwF À 1Þ1=t exp F t ðwF À Yt Þ1=t t See Eq. 22). If t > 0, Bx ¼ 0, and a ¼ 1 (heterogeneous surface, no interactions, mobile layer), then we have the VT equation: & ' & ' 1 Y Yt P ¼ Pm ðwV À 1Þ1=t exp À exp tðwV À 1Þ ðwV À Yt Þ1=t tðwV À Yt Þ See Eq. (239). To´th 54 8. If t > 1, Bx ¼ BB , and a ¼ 1 (heterogeneous surface, interactions, mobile layer), then we have the BT equation: & ' & ' 1 B Y Yt BB Yt þ B exp P ¼ Pm ðwB À 1Þ1=t exp À À t ðwB À Yt Þ1=t t tðwB À 1Þ tðwB À Yt Þ See Eq.

It is obvious, because, from Eq. (157), it follows that wV > wV À Y ð167Þ that is, in the whole domain of coverage, it is valid that cmV ðYÞ > 1 ð168Þ This means that the mobility of adsorbed molecules cannot cause a change in the type of isotherm. This change may only happen if the interactions between the adsorbed molecules are taken into account, as it is done by the mFG equation. Interpretation of Adsorption Isotherms 33 The mathematically uniform and thermodynamically consistent interpretation of the mV equation is represented in Fig.

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