P15-10c The second-order decomposition reaction A - B + 2C and a pressure of 500 kPa. Experiments carried out on smaller pellets where surface reaction is a nal-diffusion-limited. Pure A enters the reactor at a superficial velocity of 3 m/s, a temperature of 5 is carried out in a tubular reactor packed with catalyst pellets 0.4 cm in diameter. The reactions yielded a specific reaction rate of 0.05 m/mol.g-cat.s. Calculate the length of bed necessary to a 80% conversion. Critique the numerical answer. (Ans.: L = 2.8 X 10-5 m) Additional information: Effective diffusivity: 2.66 X 10-8 m/s Ineffective diffusivity: 0.00 m/s Bed porosity: 0.4 Pellet density: 2 X 109 g/m Internal surface area: 400 mg DIE 11