This study aimed to investigate the influence of the content of crystalline (10, 30, 60%) and amorphous (90, 70, 40%) aluminosilicates in the starting granules prepared for the synthesis of hierarchical ZSM-5 zeolite on the physicochemical properties, activity, selectivity, and stability of the resulting materials in the Skraup reaction for quinoline synthesis. As the ZSM-5 content in the parent granules was raised from 10 to 60%, increasing trends were observed for the micropore volume (from 0.10 to 0.13 cm³/g) and mesopore volume (from 0.05 to 0.19 cm³/g) in the granules of the resultant hierarchical zeolites H-ZSM-5_h(10, 30, 60). At the same time, the macropore volume decreased from 0.34 to 0.29 cm³/g. The H-ZSM-5_h(60) sample had the highest concentration of acid sites and exhibited the highest activity and selectivity in the Skraup reaction, as evidenced by 72% yield of quinolines. Moreover, this sample exhibited the highest stability, H-ZSM-5_h(60) remained stable for 9 h, whereas the activity of H-ZSM-5_h(10) and H-ZSM-5_h(30) dropped after 3–4 h.

The paper describes synthesis of ZSM-5 zeolite using two amorphous synthetic aluminosilicates prepared by different methods: one involved precipitation from solutions of sodium silicate and aluminum sulfate, and the other was based on sol–gel synthesis using tetraethyl orthosilicate and aluminum nitrate. The method for the preparation of amorphous aluminosilicates was shown to affect the morphology, dispersion, and porous structure of ZSM-5 crystals.

The paper investigates the mass transfer between the liquid and solid phases during the crystallization of granules that contained 60 wt % of powdered ZSM-5 and 40 wt % of amorphous aluminosilicate in a sodium silicate solution. The chemical and phase compositions and the porous properties of the resultant zeolite-containing products were identified. Based on the findings obtained, a stepwise mechanism was suggested for the synthesis of high-crystallinity granular ZSM-5 zeolite with a hierarchical porous structure.

This study investigates the chemical and phase compositions, acidic properties, and porous structure characteristics of an acidic support for a bifunctional catalyst. This catalyst was a high-crystallinity granulated hierarchical H-ZSM-5 molecular sieve promoted with 0.5 wt % Pt. The catalytic transformations of n-hexadecane and a diesel fuel were further investigated using this catalyst. The catalyst exhibited a higher activity in the hydrocracking of higher n-paraffins than a bifunctional catalyst that contained 20 wt % Al₂O₃ as a binder. Furthermore, at 220°C, 3 MPa, 2.0 h^–1, and H₂/feed = 800 m³/m³, a diesel fuel with a pour point of –68 °C was produced over the prepared catalyst with a yield of about 71–72 wt %.

In this paper, we discuss options for the synthesis of granular free-binder ZSM-5 zeolites using synthetic aluminosilicates prepared by sol-gel technology with organic and inorganic silicon sources. It has been shown that the properties of the amorphous aluminosilicate used to prepare the initial granules influence the crystallization conditions, as well as the morphology and size of the crystals formed from granular ZSM-5 zeolite. The granular free-binder Pt/ZSM-5 with a developed secondary porous structure showed higher activity in the hydrocracking of hexadecane than the granular binder Pt/ZSM-5. At a reaction temperature of 220 °C, the conversion of n-hexadecane in the granular free-binder sample was 59.1%. At the same time, the selectivity for hexadecane isomers was 15.7%.