Hydrothermal synthesis of zeolite HSZ-30 based on kaolin

Abstract

Abstract We were the first to study natural kaolin and, on its basis, obtained a zeolite of the HSZ-30 type. As samples of selected Pakhtachinsky kaolin containing of 68.8% mordenite (Ca2,2Na2,1K2,9Al9,3Si42,2O98·36H2O) and 31.2% quartz (SiO2). The sample was thoroughly washed with distilled water and dried at 120 ° C for 6 days. Hydrothermal synthesis was carried out in Mori type autoclaves with a volume of 20 cm3. Optimal conditions for obtaining zeolite of the HSZ-30 type: temperature 120 ° C, concentration of thermal solution 2 N, processing time 6 days. IR spectroscopic studies were carried out on a Nicolete IS-10 IR spectrometer (Thermo Scientific, USA) in the frequency range 400…5000 cm−1. The phase and chemical composition of the initial and final products was determined by X-ray (2D PHASER «Bruker» (CuKa – radiation, 2Θ = 20-80°) and elemental (Launch of Trition XL ditution refrigerator – Oxford instrument) methods of analysis. The article presents the results of a study of the influence of the conditions of hydrothermal synthesis (H2O/Si ratios in precursor mixtures and synthesis of temperatures) HSZ-30 for crystal size and morphology.