The Dual Reaction Center Site Model

Figure 16.21 convincingly shows the advantage of the dual reaction center site model over the single reaction center site model at high value of a. This is the condition in which the rate of CO consumption becomes inhibited by the... 

The approximate expressions of a and CO consumption to be used in the dual reaction center site model are as follows [9] ... 

Only the catalyst dual reaction center site model to be discussed in Section 16.4.2 will be able to restore high conversion with low values of rate of chain growth termination. 

In Figure 16.21, Rq+ and Rqq are compared for single reaction center and dual reaction center site models with the same reaction parameters of Figure 16.16. 

A longer implies a decrease in CO dissociation rate or decrease in k. In case 4, a increases, kj has to decrease unless the rate of C-C bond formation sharply increases. The increase in rate of CO consumption is consistent with an increase in number of reactive centers. A decrease of kj affects CO conversion negatively, unless CO dissociation is slow compared to the rate of C-C bond formation (polymerization model Umit). However, a faster rate of CO dissociation counteracts the increase of The increase in CO consumption and decrease of k, are consistent with dual reaction center site model. The addition of promoting reducible oxides may lead to the presence of dual reaction center sites, resolving the... 

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