Síntesis y caracterización de zeolita tipo LTA a partir de arcillas de Ecuador

Abstract

Abstract:In the present work, the synthesis of LTA zeolite was made from clays from Ecuador, varying the zeolitization conditions. First, the Silicon / Aluminum ratio was determined through an X-ray Fluorescence (FRX) characterization to set the synthesis conditions. The clays were then subjected to the zeolitization process using the NaOH fusion method, and subsequent hydrothermal crystallization at 90 ° C. Various tests were made varying the time and temperature of calcination with NaOH, to determine the effect of these variables on the synthesis. In addition, the kinetics of crystallization were studied, indicating 2 h to achieve the greater crystallinity of the zeolite, and the effect of using the mother liquor as an alkaline solution in the synthesis, which delayed crystallization. The zeolitized clays were subjected to a characterization by DRX, FRX, determination of specific area and CO2 adsorption capacity of the starting clays and of the synthesized zeolites, where the increase is observed remarkably compared to the original clays, however, The chemical composition does not change appreciably.