439 Aluminosilicate Oxide Mixture Catalyst: A Model of Mass Transport for Copper Impregnation by CFD

Friday, November 6, 2009: 1:40 PM
Pancho Villa (Camino Real Hotel)
Alberto F. Aguilera-Alvarado , Department of Chemical Engineering, University of Guanajuato, Guanajuato, Gto., Mexico
Irene Cano-Aguilera , Department of Chemical Engineering, University of Guanajuato, Guanajuato, Gto., Mexico
David A. Del Haro-Del Rio , Department of Chemical Engineering, University of Guanajuato, Guanajuato, Gto., Mexico
J. Merced Martínez-Rosales , Department of Chemical Engineering, University of Guanajuato, Guanajuato, Gto., Mexico
Ignacio Galindo-Esquivel , Department of Chemical Engineering, University of Guanajuato, Guanajuato, Gto., Mexico
Agustín R. Uribe-Ramírez , Department of Chemical Engineering, University of Guanajuato, Guanajuato, Gto., Mexico
A 3-D model using the Computer Fluid Dynamics technique has been elaborated for investigating the impregnation of metal-containing compounds on a synthetized aluminosilicate catalyst, considering an enhanced mass flux from the impregnating solution outside the catalyst pellet by a liquid-stirred device to the mass transport by diffusion and reaction-adsorption phenomena at the pellet inner structure. The SiO2/Al2O3 type material was prepared from aluminum sulfate and colloidal silica, varying the composition molar ratio in order to obtain oxide mixtures with good mechanical properties to be utilized in a continuous regime. The oxides molar ratio of 1:3 rendered excellent surface area, better agglomeration and a minimum of aluminum dissolved in solution. The material characterization was performed using X-ray diffraction, BET analysis, IR and other techniques to determine the diameter and volume of the pores and metal impregnation inside the pellet. The metal impregnation with copper was suggested rendering a maximum impregnation of 17 mg Cu/g, at pH 4 and 25 oC. A semi quantitative technique by XRF device was used to determine the copper distribution on the inner surface of the agglomerates. The CFD mass transport model case was solved including fluid dynamics revealing a detailed 3-D impregnation process, assessing the goodness of such material and this new technique for the catalyst preparation procedure.
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