COMPOSITE BASED ON ZSM-5 STRUCTURAL TYPE NANOSIZED ZEOLITE IN PROTON FORM AND SILICON CARBIDE, AND METHOD FOR ITS PRODUCTION Russian patent published in 2023 - IPC C01B39/38 C01B39/48 B01J29/40 B01J27/224 B01J37/34 B01J35/10 B01J37/04 B82B3/00 

FIELD: zeolite composite.

SUBSTANCE: present invention is related to a composite based on a ZSM-5 structural type zeolite in proton form and silicon carbide for heterogeneous catalysis, as well as to a method for producing such a composite. Composite contains, wt.%: silicon carbide - 15-20 with nanosized particles of zeolite of ZSM-5 structural type with silica module 329 being the rest, and the composite is characterized by additional porosity formed by particles of zeolite of ZSM-5 structural type with a size of 90-150 nm. The method for obtaining the described composite consists of first adding a template tetrapropylammonium hydroxide to water and mixing the resulting solution with a source of silicon (tetraethylorthosilicate) with constant stirring in a water bath at 70-80°C for 6 hours, then a source of aluminum (aluminum isopropoxide) is added with silicon carbide which are mixed until a homogeneous mass, mixing of the initial components is carried out in amounts that ensure the following molar ratio of the components tetraethylorthosilicate:water:tetrapropylammonium hydroxide:aluminum isopropoxide:silicon carbide in the final mixture: 1:4.2-4.4:0.2-0.3:0.006:0.3, crystallization is carried out under the conditions of hydrothermal-microwave synthesis, first, the template tetrapropylammonium hydroxide is added to water and the resulting solution is mixed with a source of silicon (tetraethylorthosilicate) with constant stirring in a water bath at 70-80°C for 6 hours, then a source of aluminum (aluminum isopropoxide) is added with silicon carbide which are mixed until a homogeneous mass, mixing of the initial components is carried out in amounts that ensure the following molar ratio of the components tetraethylorthosilicate:water:tetrapropylammonium hydroxide:aluminum isopropoxide:silicon carbide in the final mixture: 1:4.2-4.4:0.2-0.3:0.006:0.3, crystallization is carried out under the conditions of hydrothermal-microwave synthesis, ensuring the reaction mass temperature of 205-215°C, followed by calcination at a temperature of 600°C to obtain a composite based on a zeolite of ZSM-5 structural type in proton form and silicon carbide.

EFFECT: increased specific surface area up to 504 m²/g, increased specific surface area of micropores up to 470 m²/g, increased external surface area up to 34 m²/g, increased specific surface area of mesopores up to 23 m²/g, increased pore volume up to 0.49 cm³/g, increased mesopore volume up to 0.21 cm³/g, increased macropore volume up to 0.11 cm³/g.

4 cl, 4 dwg, 1 tbl, 3 ex