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According to international standards, motor fuels require limits on the content of sulfur, benzene, aromatic and olefinic hydrocarbons. To achieve this goal, it is necessary to create new, active and selective catalysts and improve technologies for deep hydrotreating and hydroprocessing. Tetradecane and diesel oil fraction hydroprocessing on modified zeolite-containing Ni(Co)-Mo(W)/Al2O3-ZSM-5 catalysts were studied under varying process conditions. The novelty of the work lies in the synthesis of new catalysts based on ZSM-5 type zeolite, modified with metals Ni(Co)-Mo(W) and active additives of rare earth metals and phosphorus. After hydrotreating the diesel oil fraction on the catalyst KT-3, the pour point decreases from -27 to -57°C, the sulfur level decreases from 0.141 to 0.059%, and the yield of the liquid phase is 92.2%. The lowest content of residual sulfur (0.005%) is observed on the KT-4 catalyst at 400°C. Electron microscopic examinations have demonstrated that the modified zeolite-containing catalysts are distributed in a highly dispersed manner, and the metal components in the active phase are primarily in the oxidized state, generating associate clusters on the surface, the dispersion, structure and state of which is influenced by the catalyst components' characteristics. The developed modified zeolite-containing catalysts have multifunctional properties and simultaneously carry out the reactions of hydrocracking, hydroisomerization, hydrodesulfurization and dehydrogenation.

This study aimed to investigate synthesized wollastonite based on amorphous silicon dioxide and calcium carbonate as adsorbent for cleaning hydrocarbon feedstock from heavy organometallic compounds and sulfur. During the analysis, physicochemical parameters including the specific surface area and intensity of synthesized wollastonite were determined. The results showed that the optimal temperature zone for demetallization of hydrocarbon raw materials was 653 - 683 K, with a contact time of 60 minutes, and pressure of 8 - 10 atm. Furthermore, the content of vanadium, nickel, iron, and sulfur was found to decrease from 540 to 52 µg/kg, 50 to 26 µg/kg, 50 to 12 µg/kg, and 3.50% to 2.39%, respectively.

The hydroprocessing of gasoline on modified alumina catalysts makes it possible to obtain high-octane products. The implementation and development of the process have largely become possible due to the development of modified alumina catalysts that do not contain noble metals and exhibit special catalytic properties. This article discusses topical issues of petrochemistry, namely the creation of catalysts with improved characteristics for the production of high-octane gasoline with low sulfur content. New catalytic systems based on alumina and other carriers modified with transition metals, lanthanum and phosphorus were synthesized. By physico-chemical methods of analysis TPD of ammonia, TEM and XRD, we studied the acid–base and structural characteristics of the developed catalysts. The activity of the developed catalysts in the studied process of hydrotreating gasoline fractions depends on the structure and condition of the active centers. The process of hydrotreating straight-run gasoline in the presence of synthesized catalysts was carried out on a laboratory flow unit. It was shown that, during the hydrotreating of straight-run gasoline on the NiO-MoO3-La-P-HZSM-HY-Al2O3 catalyst, the octane number in the final product increased to 88.6, and the sulfur content decreased from 0.0088 to 0.001%. It was found that the minimum sulfur content in the gasoline hydrotreating product of 0.0005% was achieved on the catalyst CoO-WO3-La-P-HZSM-HY-Al2O3, which is significantly lower than for other studied catalytic systems. The obtained results of the sulfur content in the hydrotreating products fully comply with the Euro-5 standard. Thus, the efficiency of hydrotreating the gasoline fractions studied in this work was mainly determined by the nature of the carriers and modifiers used for the synthesis of catalysts and the technological parameters of the process. The synthesized catalysts showed high activity and selectivity, resulting in high-octane gasoline with a low sulfur content that meets international quality standards.