Total SO2 Oxidized After All Catalyst Beds

All of this chapter s efficiency comparisons are based on total % SO2 oxidized after all catalyst beds, defined as  

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Figure 27.6 Effect of recycling cooled first catalyst exit gas on total % SO2 oxidized after each catalyst bed. Figure 27.5 s advantage is maintained in all beds, but it decreases with each successive bed.

So far, this chapter has examined after-intermediate-H..S04- nakinp SO oxidation efficiency. However, Section 19.6 also provides the information needed to calculate total % SO2 oxidized after SO2 oxidation in all of Fig. 19.2 s catalyst beds. The values are ... 

All catalysts, operated either in laboratory or conmiercially, are deactivated during their use. Deactivation is very important in commercial operation because it influences the choice of the operational conditions and fixes the cycle length between regenerations and the total life of the catalyst. Some catalysts remain active for a decade (catalysts for oxidation of SO2 and for ammonia synthesis) whereas others must be regenerated after a few minutes of operation (catalysts for fluidized bed hydrocarbon cracking). 

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