The use of a differential reactor to study the formation of methane from hydrogen and carbon monoxide over a nickel catalyst gave the following: 0.01830 mol/cat Suggest a mechanism and rate-limiting step that is consistent with the experimental observation. It is desired to produce 20 tons/day of CH 4. Calculate the catalyst weights necessary to achieve 80% conversion in: (a) A fixed bed. (b) A fluidized bed. The feed consists of 75% H and 25% CO at a temperature of 500°F and a pressure of 10 atm. Assume both molecular 2 and atomic hydrogen are adsorbed on the surface. CH 4 0.01831/2 FCO 1 + 1.5FH₂ H2 mol/g cat. 8