Effectiveness factor plot

Effectiveness factor plot for spherical catalyst particles based on effective diffusivities (first-order reaction). 

Effectiveness factor plot for nth-order kinetics— spherical catalyst particles... 

Figure 2. Effectiveness factor plots for Reactions 1 and 2. Example 2.

Nevertheless, there are some notable differences between An0 and Anv As discussed previously, An0 is important for the low 17 region, and hence is of interest from a theoretical view-point, whereas An, is important for the high rj region and thus of interest in practice. There are other differences as well To illustrate these it is necessary to discuss and understand effectiveness factor plots that are somewhat more exotic than those described so far. 

In Figure 6.11 effectiveness factor plots are given for wth-order kinetics in a slab. The lines were calculated with the formulae given in Table 6.5. The effectiveness factor in... 

From Figure 6.11 shows that three basically different effectiveness factor plots can be obtained ... 

Figure 12-5 (a) Effectiveness factor plot for nth-order kinetics spherical catalyst particles (from Mass Transfer in Heterogeneous Catalysis, hy C. N. Satterfield, 1970 reprint edition Robert E. Krieger Publishing Co., 1981 reprinted by permission of the author), (b) First-order reaction in different pellet geometries (from R. Aris, Introduction to the Analysis of Chemical Reactors, 1965, p. 131 reprinted by permission of Prentice-Hall, Englewood Cliffs, NJ)... 

FIGURE 11.6 Effectiveness factor plots for a simple nonisothennal reaction in a spherical pellet (Weisz and Hicks, 1962). 

Figure 3.6.C-I Effectiveness factor plot in terms of observable modulus. 

Figure 12.7 Effectiveness factor plots for sphere and slab geometries for first- and zero-order kinetics. The Thiele modulus is given by = RyJfor spherical catalysts or by...

Figure 7.5 Effectiveness factor plots for a biomolecular reaction (redrawn from Xu and Chuang, 1997).

Figure 7.7 Effectiveness factor plots for LHHW kinetics. Negative values represent desorption of product with = Pas tid = k, a new parameter (adapted from Roberts and Satterfield, 1965).

Figure 17.2 Overall effectiveness factor plots for a first-order reaction (Chaudhari and...

Figure 23.4 shows the effectiveness factor plotted against network Thiele modulus obtained for four simulation pressures in the range 27.5-27.8 bar, for which capillary condensation occurs. 

Whereas Figure 2.20 is quite instructive, it is not of practical use for estimating the importance of the mass transfer influence from experimental data, as the intrinsic rate constant is normally unknown. Replotting the effectiveness factor as function of the ratio between observed reaction rate to the maximum mass transfer rate called as Carberry number Ca) allows estimating the external effectiveness factor plotted in Figure 2.21. 

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