HYDROTHERMAL SYNTHESIS OF ZEOLITE WITH STRUCTURE OF ZSM-5 ON THE BASE OF NATURAL SAMPLE OF NAKHCHIVAN
One of the most important objectives of the study crystallization processes of zeolites is the creation of materials with predetermined structure and composition. The aim of this work was the hydrothermal treatment, that is, the modification of the natural sample of Nakhchivan to produce a catalyst. The first time studied the physico-chemical properties and structural-chemical transformation of the natural sample of Nakhchivan under conditions of hydrothermal treatment and the preparation of zeolite ZSM-5 on its basis. On the basis of natural sample of Nakhchivan was obtained of zeolite of sodium-containing of ZSM-5. The synthesis was conduct in hydrothermal condition. The condition for obtaining a zeolite of type ZSM-5 is a temperature of 120 ℃, the concentration of a thermal solution of NaOH 2 N, autoclave filling of 80 %, a treatment time of 6 days. The initial sample and resulting zeolite was investigated by X-ray diffraction (2D PHASER «Bruker» (CuKα-radiation, 2θ = 20-800)), derivatografic (derivatograph Q-1500D), IR-spectroscopic (IR spectrometer «Nicolete IS-10» in the frequency range 400-5000 cm-1), element (Launch of Trition XL ditution refrigerator - Oxford instrument) methods of analysis. According to the X-ray analysis, the zeolite ZSM-5 crystallizes in a orthorhombic system with the parameter a = 20.07 Å, b = 19.92 Å, c = 13.42 Å and the empirical formula of the obtained ZSM-5 zeolite is established: Na2,83Al3Si16,32O37,42. Investigated exchange cation, dehydration-rehydration properties were obtained of the zeolite. It was found, that the obtained zeolite was completely rehydrated within 48 hours and can be used as a catalyst. It is shown that on the basis of the natural sample of Nakhchivan, the hydrothermal process was carried out without complexity, without auxiliary components and easily obtained zeolite of ZSM-5. The resulting zeolite has a high crystallinity.