Determining the Order of Deactivation

Determination of Integral Method When the concentrations of reactants and products in the cay order for phase change very slowly with time, the pseudo-steady-state forms of the order n balances can be used. For the irreversible nth-order reaction carried out 

In our efforts to determine the order of decay, we assume that the main reaction order is a known quantity. If it is not, a dual-model trial-and-error solution is necessary. The idea is to find the simplest model that fits the data. If we assume first-order decay. 

Substituting in = Wklv and taking the log of both sides, we obtain 

If first-order decay does not lit the data, one could tty second-order decay  

For a packed-bed reactor, the approach is quite similar to that described for a CSTR. For a first-order reaction, the combined mole balance and rate law is 

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Determining the Order of Deactivation. Note that in Figure 6 there is an intrinsic difference in the nature of the curvature... 

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