Abstract

LOPEZ-CORDOVA, Carmen Milena et al. Zeolitization of red clays from Ecuador and application in CO₂ adsorption. Ing. invest. y tecnol. [online]. 2020, vol.21, n.4, 00002.  Epub Nov 20, 2020. ISSN 2594-0732.  https://doi.org/10.22201/fi.25940732e.2020.21.4.030.

The LTA zeolite synthesis from Ecuador clays using the alkaline fusion method, and subsequent hydrothermal crystallization at 90 ° C, was carried out. The clays were calcined with NaOH, varying the time and temperature of calcination. The composition of the synthesis mixture and hydrothermal treatment conditions were maintained in all the experiences carried out. The clay was used as a source of silicon and aluminum, adjusting the composition of the mixture with NaOH and H2O. The solids were subjected to a characterization by X-Ray Diffraction (XRD), X-Ray Fluorescence (FRX), specific area determination and CO2 adsorption capacity of the starting clays and of the synthesized zeolites. It was possible to obtain zeolite A, using the same synthesis conditions for the three clays studied. The study of the evolution of the crystallization with time, indicated 2 h as an adequate time to obtain the zeolite. The specific area and the adsorption capacity of the zeolites obtained from the clays are remarkably increased compared to the original clays, however, the chemical composition does not change appreciably.

Keywords : Clays; Zeolite LTA; alkaline fusion; CO₂ adsorption.

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