Question: The data given below, on diffusion of nitrogen (A) and helium (B) in porous catalyst pellets, have been proven by Henry, Cunningham, and Geankoplis

The data given below, on diffusion of nitrogen (A) and helium (B) in porous catalyst pellets, have been proven by Henry, Cunningham, and Geankoplis

The data given below, on diffusion of nitrogen (A) and helium (B) in porous catalyst pellets, have been proven by Henry, Cunningham, and Geankoplis (Chem. Eng. Sci., 1967, 22, 11) Ng mol am?. P.(mmHg) YAL NA x 10 NA 2.52 cm2 s 0.500 0.0407 0.911 0.449 1.506 0.0358 0.900 0.881 3.06 0.0888 0.863 2.62 2.22 2.65 3.25 8.00 0.176 0.735 4.78 30.72 0.214 0.658 2.78 11.3 22.2 42.1 2.62 2.37 100.6 0.164 0.708 299.7 0.134 0.769 600.1 0.146 0.723 43.9 2.86 An alumina pellet with the following properties was used: Length: 1.244 cm Pore volume: 0.5950 cm3/g Porosity: 0.233 (macro) 0.492 (micro) Pore radius: 20,000 (macro) 37 (micro) Internal surface: 202 m2/g The data given below, on diffusion of nitrogen (A) and helium (B) in porous catalyst pellets, e been proven by Henry, Cunningham, and Geankoplis (Chem. Eng. Sci., 1967, 22, 11) mol Ng p:(mmHg) NA X 108 cm2. 0.449 YAL YAO NA 2.52 0.500 0.0407 0.911 1.506 0.0358 0.900 0.881 3.06 3.25 0.0888 0.863 2.62 2.22 8.00 0.176 0.735 4.78 2.65 2.78 0.658 0.708 30.72 0.214 11.3 22.2 2.62 100.6 299.7 0.164 2.37 2.86 0.134 0.769 42.1 600.1 0.146 0.723 43.9 alumina pellet with the following properties was used: Length: 1.244 cm Pore volume: 0.5950 cm3/g Porosity: 0.233 (macro) 0.492 (micro) Pore radius: 20,000 (macro) 37 (micro) Internal surface: 202 m2/g Compare the flux ratios with the theoretical prediction. Compute the experimental diffusivities, and plot Dept versus p. At what pressure is there a transition between Knudsen and bulk diffusion?

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