Experimental and heoretical escription of the quilibrium dsorption of etal on olutions on the urface of -Al O and MoO / -Al O systems

https://doi.org/10.25100/iyc.v12i1.2703
EQUILIBRIUM ADSORPTION LIQUID SOLID ADSORPTION ADSORPTION ISOTHERMS ALUMINA MOLYBDENUM PLATINUM COBALT CATALYSTS PREPARATION.

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Published: Jun 9, 2010
Issue: Vol. 12 No. 1 (2010)
Section Artículos de investigacion

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Authors

Fiderman Machuca Martínez
José L. G. Fierro
Abstract

The equilibrium adsorption isotherms of Mo, Co and Pt species on γ-Al2O3 and Co and Pt on MoO3/γ-Al2O3 oxides were studied. The Molybdena-alumina catalysts for adsorption tests were prepared by impregnation of γ-Al2O3 supports with aqueous solutions of ammonium heptamolybdate. The equilibrium adsorption data were obtained from liquid-solid adsorption process. L-type shaped adsorption curves were found for Mo and Co on γ-Al2O3 and Co(Pt) on MoO3/γ-Al2O3 whereas S-shaped were found in the Pt(Co) on MoO3/γ-Al2O3 systems. In the Mo system, it was found that the molybdenum species in solution (tetrahedral and octahedral) affected the Mo adsorption. The adsorption of Co(II) ions over alumina or modified alumina did not depend on the alumina source. The shape of the Co adsorption isotherm on MoO3/γ-Al2O3 appeared to be modified when Pt(IV) ions were present simultaneously. The adsorption process for Pt species depended on the presence of Mo(VI) and Co(II) ions on the supports surface. It was observed that the amount of Pt adsorbed on the surface of the MoO3/γ-Al2O3 sample decreased in the presence of Co(II) ions in solution. Finally, the equilibrium parameters for the adsorption of Mo(VI) and Co(II) on γ-Al2O3 and Co(II) and/or Pt(IV) on MoO3/γ-Al2O3 were determined.

Author Biographies

Fiderman Machuca Martínez

Laboratorio de Investigación en Catálisis y Procesos. Escuela de Ingeniería Química, Universidad del Valle, A.A. 25360. Cali, Colombia.

José L. G. Fierro

Instituto de Catálisis y Petroleoquímica, CSIC, Cantoblanco, 28049 Madrid, España
How to Cite
1.
Machuca Martínez F, G. Fierro JL. Experimental and heoretical escription of the quilibrium dsorption of etal on olutions on the urface of -Al O and MoO / -Al O systems. inycomp [Internet]. 2010 Jun. 9 [cited 2024 Dec. 22];12(1):73-9. Available from: https://revistaingenieria.univalle.edu.co/index.php/ingenieria_y_competitividad/article/view/2703
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