Kinetics of cumene cracking

III. The Kinetics of Cumene Cracking as Determined by Differential-Reactor... 

Thiele (17), Wheeler (12), and Weisz and Prater (1) have given ij vs. curves for some integral-order reaction kinetics. However, the kinetics of cumene cracking does not exhibit a simple constant order. Instead, the order is a function of partial pressure of reactants and products. To determine the jj vs. curve for this kinetics, the diffusion equation... 

Fig. 1. Kinetics of cumene cracking on dilution with cyclohexene or xylene.

Silica-alumina catalysts, kinetics of cumene cracking by, 8, 293 Sintering properties, of cracking catalysts, 4, 87... 

The Kinetics of the Cracking of Cumene by Silica-Alumina Catalysts Charles D. Prater and Rudolph M. Laqo... 

The cracking of cumene has received considerable attention in recent years as a reaction typical of one class of cracking reactions, namely dealkylation of aromatics. Among the studies of cumene cracking found in the literature there are several attempts to determine the kinetics of... 

Summary of Cumene-Cracking Kinetics Reported in the Literature... 

Any study of cumene cracking made above 400°C. with commercial cracking catalyst of conventional activity levels, with particle size of approximately 1 mm. or greater (as is the usual practice in integral reactor studies), and with pure cumene will almost certainly be diffusion limited. If this is not the case, it is by virtue of the fact that the cumene contains inhibitors which reduce the reaction rate and, of course, alter the kinetics of the reaction. This can be seen by considering the diffusion results in Table IV and the discussion of effect of inhibitors. 

Surface Characterization of the Stabilized Catalyst by Probe Molecule Reaction. HZSM-5 obtained from PQ Zeolite was chosen to study the mechanism of stabilization in light naphtha aromatization. The reactions of both molecules were carried out over stabilized and unstabilized HZSM-5. We assumed first order kinetics with respect to each reactant concentration and first order decay of each reaction, and calculated initial rate constants. Figure 6 shows the initial rate constants of cumene cracking and triisopropyl-benzene cracking over the stabilized and the unstabilized catalysts. 

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