Difference of catalytic activity on different active site or catalyst

2 Difference of catalytic activity on different active site or catalyst) 

It is quite instructive on how wt changes between the upper and lower values of t, on both sides of its maximum value tmax for values of t equal to tmax U- Thus, replacing t in Eq. (2.168) by (tmax — U), we obtain  

But this also leads to the result if we replace t by (tmax + U). Thus vt changes symmetrically with t on the both sides of vt,max (Fig. 2.27) 

To make the above ideas clearly, let / = 10, a reasonable value  

Indeed, at 750 K, this would correspond to a variation of A equal to 63kJ-mol a moderate spectrum of values for different sites or catalysts. Then, the term exp(—//4) in Eq. (2.179) can be neglected and  

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