Question

Nickel carbonyl (component B) is produced by passing carbon monoxide (component A) over nickel. The following reaction takes place at the solid surface.

Ni + 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. Therefore, the rate of carbonyl formation is limited by the rate of CO diffusion to the nickel surface. The gas outside the diffusion layer (thickness = 0.695 mm) is pure CO, the temperature and pressure of the system remains constant at 50C and 1.0 atm, respectively, the area of the nickel is 0.25 m2, and DAB = 2.0 * 10-5 m2/s. Calculate the reaction rate of nickel carbonyl in kmol/s. Assume steady state behavior and ignore changes in the nickel metal.

Repeat the calculation of the reaction rate of nickel carbonyl for the case where the reaction is not diffusion limited. Assume first order kinetics (i.e., NA = k1'cxA ), with k1' = 5.63×10-4 m/s and 5.63×10-2 m/s.

On a well formatted Excel graph, plot the mole fraction profile of CO throughout the diffusion layer (i.e., xCO vs. (z/δ) for the three reaction rates.

Answer 1

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ne 2. 0.0932 IJ