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n c S c c 2 c Eq i 1 0 model 0 exp where n is the number of data points. The standard deviation for the fitted model to experimental results was also estimated by: S Eq.(8). n 1 The effective diffusivity De was estimated from the mass transfer coefficient and a geometrical model of the adsorbent. For samples where the zeolite film dominated the mass transfer resistance, the geometry of the adsorbent was approximated with a slab, and the effective diffusivity for the film was estimated from: k l2 3 where l represent the thickness of the film or slab. Dfilm e Eq.(9), For samples where mass transfer resistance was dominated by relatively large sediments deposited from the bulk of the synthesis mixture on the growing film, the geometry of the adsorbent was approximated with spheres, and the effective diffusivity was estimated from: k R2 15 where R represent the radius of sediments or spheres, respectively. 3. Results and discussion 3.1 Characterization by SEM, weight gain, and zeolite loading Daggregate e Eq.(10), Figure 1 (a) shows a SEM image of a surface of the wall of an uncoated 400 cpsi cordierite monolith. Cordierite grains form an uneven surface and some macropores are also observed between the grains. A low magnification SEM top view-image of the 400 cpsi 71PDF Image | Structured Zeolite Adsorbents for PSA Applications
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