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Catalizadores de Pt / γ-Al2O3 con distribución no Uniforme. Estudio Teórico y Experimental
Keywords:
Preparación de catalizadores, Catálisis, Catalizadores metálicos (es)Preparation of catalysts, Catalysis, Metal catalysts (en)
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Una serie de catalizadores de Pt / γ-Al2O3 se prepararon por impregnación simultánea y secuencial por vía húmeda, con ácido hexacloroplatínico como precursor catalítico y ácido cítrico como competidor. Las concentraciones de los ácidos hexacloroplatínico y cítrico se mantuvieron constantes durante la preparación de los catalizadores y el tiempo de impregnación se varió entre 2, 6 y 12 horas. Un estudio de microscopía electrónica se realizó para el grupo de catalizadores, el cual determinó el tipo de perfil y distribución, y algunas diferencias entre los dos tipos de impregnación. Para la impregnación simultánea se planteó un modelo matemático que predice los perfiles de concentración de Pt dentro del soporte. Se consideró un mecanismo de adsorción competitiva del tipo Langmuir entre el ácido hexacloroplatínico y el ácido cítrico. La distribución y el tipo de perfil encontrados por el modelo concuerdan con los resultados obtenidos experimentalmente.
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Copyright (c) 1998 Jacqueline Ardila, Luis M. Carballo
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