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Question: fundamentals of mass transfer example 116 production of nickel carbonyl...

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Fundamentals of Mass Transfer Example 1.16 Production of Nickel Carbonyl: Steady-State, One- Dimensional Binary Flux Calculation Nickel carbonyl (A) is produced by passing carbon monoxide (B) at 323 K and 1 atm over a nickel slab. The following reaction takes place at the solid surface: Ni(s) +4CO(g) Ni(CO)4(g) The reaction is very rapid, so that the partial pressure of CO at the metal surface is essentially zero. The gases diffuse through a film 0.625 mm thick. At steady- state, estimate the rate of production of nickel carbonyl, in mol/m2 of solid surface per second. The composition of the bulk gas phase 1850 mol%CO. The binary gas diffusivity under these conditions is DAB 20.0 mm2/s. Solution Figure 1.7 is a schematic diagram of the diffusion process. The stoichiometry of the reaction determines the relation between the fluxes: from equation (1-59), N2-4NA N, + NB =-3NA. Calculate the molar flux fraction, ya. From equation (1-76):

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