INFLUENCE OF THE NATURE OF THE ALUMINUM SOURCE ON THE PHYSICO-CHEMICAL CHARACTERISTICS OF THE CARRIER OF CATALYTIC SYSTEMS FOR THE PETROCHEMICAL INDUSTRY

Abstract

In the oil refining industry of the Republic of Kazakhstan, catalysts based on synthetic zeolites are mainly used. However, it was found that catalysts of this type have a number of disadvantages. For example, most of them have pore sizes in the micropore range, which is the reason for diffusion limitations. The solution to this problem can be found by creating catalysts based on mesoporous aluminosilicate. Mesostructured aluminosilicates are widely used as catalysts for petrochemical processes due to their high specific surface area, highly ordered pore structure and narrow pore size distribution and the possibility of regulating the size of their pores during synthesis. Mesoporous aluminosilicates are widely used as catalysts for petrochemical processes due to their high specific surface area, highly ordered pore structure and narrow pore size distribution and the possibility of regulating the size of their pores during synthesis. The article presents the synthesis of mesoporous aluminosilicates by copolycondensation of tetraethylortosilicate with various sources of aluminum: secondary aluminum butoxide (MAS-1) and aluminum triisopropoxide (MAS-2). The presence of a mesoporous and ordered structure in the synthesized aluminosilicates was confirmed by the data of low-temperature nitrogen adsorption/ desorption, X-ray diffraction and FT-IR. Acidic data were investigated by the method of infrared spectroscopy of the Fourier transform with diffuse reflection (DRIFT). It is shown that the nature of the aluminum source affects both the specific surface area and porosity, and the acidic characteristics of the synthesized mesoporous aluminosilicates.