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Silicalite does not contain any cations, thus any observed heterogeneity can be attributed to the structure. Hence, the name "structural heterogeneity" is used to distinguish it from other types of heterogeneity. Benzene is used as the "probe" molecule. Its 53 A. E. Rodrigues et al. ), Adsorption: Science and Technology, 53-62. © 1989 by Kluwer Academic Publishers. 54 co repulsion t Total adsorption potential molecular radius / pore radius_ co, flat surface Figure 1. Effect of pore radius on adsorption potential molecular size is very close to the micropore diameters of silicalite.

Ngle component isotherm data for these systems but this has not yet been done. It is possible by appropriate choice of the coefficients A . to correlate highly non-ideal binary data by eqn. 30 but since there \~ no obvious way to estimate these coefficients a priori such an approach reduces the model simply to a method of data correlation and is equivalent to the introduction of activity coefficients in the classical approach. Variation of Separation Factor with Loading The separation factor for a binary mixture is defined in a manner analogous to the relative volatility: (39) 50 With XA, XB given by eqn 36 it follows that: " , " , " It " KA + KA (KAPA+'1lPB) + ~ KA (KAP A+KBPB) 2 (40) ~ + KB ('1lPB+ KAPA) + ~ In the low concentration limit only the first terms in numerator and denominator are significant so (l + KA/K as for an ideal system.

Mori, J. Chem. Eng. Data 27, 317 (1982). A. and R. Mead, Computer Journal 7, 308 (1965). , T. Shigetomi, M. Kuro-Oka and T. Katayama, J. Chern. Eng. Japan 17, 39 (1984). A. L. Myers, Ind. Engrng. Chern. Process Des. Dev. 24, 1188 (1985). A. L. Myers, "Activity Coefficients for Adsorption of Laterally Interacting Molecules on a Random Heterogeneous Surface," in Fundamentals of Adsorption, ed. I. Liapis, Engineering Foundation, New YOlk (1987), pp. 451-461. N. G. , Englewood Cliffs, NJ (1986). P.

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