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Al/Fe-PILC catalyst: Bench-scale preparation and shaping as extrudates

Galeano, Luis-Alejandro Y Pusapaz, Nataly (2015) Al/Fe-PILC catalyst: Bench-scale preparation and shaping as extrudates. In: Conference: XXIV International Materials Research Congress, At Cancún - México, Agosto 2015, Cancún- Mexico.


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Preparation of Al/Fe-pillared clays (Al/Fe-PILC) has been extensively studied along the past few years because their low-cost, microporous structure and high catalytic performance in environmental applications. However, the scaling up of preparation and shaping without significant loss of catalytic properties use to be a challenging issue [1]. Thus, this work focused in the intercalation/pillaring of a starting Colombian bentonite by Al/Fe-polycations at 2.0 Kg scale, followed by shaping in cylindrical extrudates. The starting natural clay, mainly in its Ca2+ cationic form, was interlayered in ethanol-based concentrated suspension (50 % w/v) with a polycationic Al/Fe precursor under the following set of conditions previously improved [2]: atomic metal ratio of Fe (AMRFe) = 5.0 %; total concentration of metals (TCM) = 0.6 mol/L and hydrolysis ratio OH-/(Al+Fe) (HR) = 1.6, in 100 L reactor shaken by air injection. The aluminosilicate was successfully interlayered as confirmed by shifting of the d001 signal in the powder XRD pattern to lower 2θ angle (expansion from 1.52 to 1.75 nm), the increased content of Al and Fe and the declined cationic exchange capacity. In the other hand, the mixture for shaping of the functional material in extrudates was made using interlayered Al/Fe-clay (prior to calcination) as active phase, the raw bentonite as a binder and water as lubricant. Several mixtures with different ratios active phase/binder were assessed keeping constant the amount of water required for proper extrusion (normalized to 38 %). Composition, plasticity, thermal treatment, mechanic resistance and chemical stability where recorded as key properties to improve the shaping of the functional material. The mechanical properties were optimal with calcination at 500 °C irrespective the ratio active phase/binder; besides, extrudates calcined at 500 °C exhibited higher capacity of adsorption when the amount of binder was increased. A mass ratio 43/19/38 for active phase/binder/water was found the optimal in term of both, mechanical and chemical stability (against Fe leaching) of the extrudates.

Tipo de Elemento: Conferencia o Taller artículo (Poster)
Asunto: Q Ciencias > QD Chemistry
Division: Facultad de Ciencias Exactas y Naturales > Programa de Química > Productividad
Depósito de Usuario: PhD Luis Alejandro Galeano
Fecha Deposito: 07 May 2018 17:26
Ultima Modificación: 07 May 2018 17:26

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