02. The global rates of SO2 oxidation have been measured with a platinum catalyst impregnated on the outer surface of 8181-in. cylindrical pellets of Al2O3. The data were obtained in a differential reactor consisting of a 2-in.-ID tube packed with the catalyst pellets. The superficial mass velocity of the reaction mixture was 350lb/(hr)(ft2). At constant conversion of 20% of a feed consisting of 6.5 mole %SO2 and 93.5 mole \% air, the rates are as shown below. The total pressure was 790mmHg. Consider the properties of the mixture to be those of air, except for the Schmidt number for SO2, which is 2.9. (a) If only the data at 460 to 500C are used and external diffusion is neglected, what is the apparent activation energy? (b) By calculating (Cb Cs)SO2 at various temperatures and using all the data above, estimate the true activation energy for the combined adsorption and reaction processes 396 CHAPTER 10 EXTERNAL TRANSPORT PROCESSES IN HETEROGENEOUS REACTIONS at the catalyst surface. Neglect temperature differences between bulk gas and catalyst surface