Abstract
Impregnation of flat thin layers of porous supports by means of an unidirectionally flowing fluid has been studied. Since it is similar to pore-filling impregnation, this technique enables the qualitative behaviour of pellet impregnation to be predicted. Aqueous solutions of ammonium heptamolybdate were used to impregnate both γ-Al2O3 and γ-Al2O3 samples containing 2.1 g Co per 100 g Al2O3. The molybdenum concentration profiles were similar in both supports. Thus both exhibited a plateau region over which an equilibrium existed between the concentration of adsorbed molybdenum and that in the solution within the pores, followed by a sharp decrease in which a shoulder was observed. This behaviour may be related directly to the shape of the molybdenum adsorption isotherms on both supports. Such profiles were analyzed using a theoretical model to estimate the kinetic parameters of adsorption. These parameters are useful for predicting concentration profiles of active species in pellets of any geometry.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
