By John B. Butt
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Additional info for Activation, Deactivation, and Poisoning of Catalysts
With similar rate expressions developed for each of the M-heptane reac tions, an n -heptane component balance according to the scheme of Fig. 2-3 yields d(nP7)/dt=-9l(nP7*±iP7)-9t(nP7*±6ft7)-9i(nP7i±5N7) -^(nP7^Cr) + ^(P8^nP7) where Cr are cracked products. (2-73) I. 5 M-Pentane iP5 5N 5 nP4 iP4 P3 P2 i-Pentanes Cyclopentane n-Butane /-Butane Propane Ethane Methane Hydrogen Pi H Catalyst deactivation in reforming reactions is primarily via coke deposi tion, and the rate of deactivation is a strong function of hydrogen partial pressure.
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. Reinhold, New York, 1955. 11. 12. 13. 14. 15. 16. 17. 18. CHAPTER 2 Mathematical Description of Deactivating Systems Some aspire to gain immortality through their work. I want to be immortal by not dying.
In a system where deactivation occurs very rapidly, this poses very serious problems experimentally. These prob lems have been discussed by Petersen and Pacheco (18). The purpose of this section is to discuss briefly these two points and their relationship to the type of equipment used to study deactivation. Integral reactors, illustrated in Fig. 2-5, are frequently used to obtain data on catalyst deactivation on the pilot plant scale. This type of reactor FeedFig. 2-5. Deactivation in an integral reactor.
Activation, Deactivation, and Poisoning of Catalysts by John B. Butt