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Extra resources for Activation, Deactivation, and Poisoning of Catalysts

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The rate of the main reaction is, in general, for a system of constant activity rate of reaction =f(c1,c2, c 3 , . . , c,·, T) =f(c„ T) (2-1) When we consider deactivating systems, Eq. (2-1) represents the initial reaction rate, that is, [ reaction rate of catalyst initially. lo=A(ci9T) (2-2) If, now, after some deactivation of the catalyst has occurred, the rate of the main reaction is measured again at the same values of the concentrations and temperature to obtain ^"reaction rate ofl catalyst after = Mt=f2(ci9T) L deactivation J (2-3) it is convenient then to define the activity as a^mt/m0 (2-4) Thus the activity is an operational parameter of considerable utility in characterizing the changes in the reaction rate of a catalyst as it deactivates, and it is obtained easily and directly from the experimental results.

H. Pines and W. O. Haag, J. Am. Chem. Soc. 82, 2471 (1960). P. A. Sermon and G. C. Bond, Catal. Rev. 8, 211 (1973). M. Shelef, K. Otto, and N. C. Otto, Adv. Catal. 27, 311 (1978). S. Szepe and O. Levenspiel, Chem. React. , Proc. Eur. , 4th, 1968, p. 265 (1971). T. Uchijima, J. M. Herrmann, Y. Inoue, R. L. , J. B. Butt, and J. B. Cohen, J. Catal. 50, 464(1977). R. Van Hardeveld and F. Hartog, Surf. Sei. 15, 189 (1969); Adv. Catal. 22, 76 (1972). A. Wheeler, in "Catalysis" (P. H. ), Vol. 2, p. 105.

24 gave the parameter values for Eq. (2-48) listed in Table 2-1. The small range of E indicates that the rate-determining step is not affected by poisoning. However, K does not change proportionately with 40 2. 4 activity, as postulated in the separable formulation, and q decreases by almost 40% over the activity range investigated. Figure 2-1 shows a com­ parison of the fit of data by Eq. 06/c), respectively. Clearly there are significant deviations from the model of kinetic separability. 30 "250 (Ι/ΌχΙΟ3, K_l Fig.

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