b) We want to build a packed bed reactor filled with 1.2cm porous catalyst particles (s=2000 kg/m3,De=2106m3/m cat. s) to treat 1m3/s of feed gas (1/3A,1/3B,1/3 inert) at 336C and 1atm to 80% conversion of A. Experiments with fine catalyst particles which are free from diffusional resistance show that: How much catalyst must we use? [16]