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
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Authors
Dates
2023-07-11—Published
2022-06-17—Filed