Oriental Journal of Chemistry is a peer reviewed quarterly research journal of pure and applied chemistry. It publishes standard research papers in almost all thrust areas of current chemistry of academic and commercial importance. It provides a platform for rapid publication of quality research papers, reviews and chemistry letters. Oriental Journal of Chemistry is abstracted and indexed in almost all reputed National and International agencies.

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.

The processes of converting propane-butane and propane-propylene fractions into aromatic hydrocarbons on zeolite catalysts modified by the introduction of Zn, La, Fe, Co, and phosphorus has been investigated. The behavior of catalysts in the processing of light hydrocarbons depends on the structure and state of active centers. Physicochemical characteristics of the developed catalysts have been investigated. The highest yield of aromatic hydrocarbons has been observed on the Zn-La-Fe-P-ZSM-Al₂O₃ catalyst, where their yield reaches 52.6% in processing the propane-butane fraction at 600°C, while the selectivity for aromatic hydrocarbons is 64.6%. When the propane-propylene fraction is processed in the temperature range of 350–600°C, the yield of aromatic hydrocarbons on the Zn-La-Fe-P-ZSM-Al₂O₃ catalyst is significantly higher than in other investigated catalysts. A comparison of the results of processing propane-butane and propane-propylene fractions has shown that the yield of the aromatic hydrocarbons is higher when using propane-propylene fractions. For example, at a temperature of 550°C on the Zn-La-Fe-P-ZSM-Al₂O₃ catalyst, the liquid phase yield when processing the propane-butane fraction is 43.6% and the propane-propylene fraction is 59.1% at a conversion rate of 70.2 and 88.3, respectively.

The reserves of liquefied petroleum gas in the production zones and fields are briefly characterized in present paper. The scope of liquefied petroleum gases application, catalytic transformation and their importance in obtaining products are described. Widespread use of nanostructured and nanoscale catalysts in catalysis processes and their properties are given in literature review. Chemical transformations of С3-С4-alkanes in the presence of mono- and bimetallic catalysts based on Cr/SiO2 are studied. By method of electron microscopy, it was determined that various highly dispersed oxides of chromium in lanthanum – modified catalyst interact with each other and with carrier. According to electronic paramagnetic resonance data, chromium is contained in a five- and three-valence state. Mono - and bimetallic catalysts were studied by physical and chemical methods: IR spectroscopy, electron microscopy (EM) using micro diffraction, EPR. Monometallic catalysts with a chromium content of 2-10 wt. % and bimetallic lanthanum-chromium-containing catalyst in the form of 5% La-Cr/SiO2 in a ratio of 1/1 were prepared in the work; the process temperature was varied in the range of 400 to 650°С. Introduction of lanthanum leads to the formation of LaCrO3, LaCrO4 compounds with low activity in dehydro-genation reaction of C3-C4 – alkanes. The maximum yield of C2-C4-olefins - 39.2%, i.e. the formation of propylene in high doses was observed in the presence of 5% Cr/SiO2.

The process of hydrogen-free processing of petroleum fractions on zeolite- containing catalysts was implemented at a laboratory catalytic plant under conditions of varying technological parameters. Modification was carried out with metals with variable valence, REM, and phosphorus. It is shown that in the process of refining gas condensates and petroleum fractions (gasoline and diesel) without hydrogen-containing gas, the catalytic properties, activity and selectivity of synthesized catalysts depend on the nature and concentration of the introduced modifiers, the structure and condition of the active centers and the conditions of the process. The directions of hydrocarbon transformations in the process of anhydrous refining on a zeolite catalyst are considered. It has been established that the catalysts have multifunctional properties, and are capable of simultaneously conducting several reactions: cracking, hydrodesulfurization, dehydrogenation, isomerization, dehydrocyclization, alkylation. The physicochemical characteristics of zeolite-containing catalysts have been studied by electron microscopy and thermal desorption of ammonia. It is shown that acidic centers coexist with metallic ones on the surface of the developed catalysts. The composition of acid centers may include metals in various degrees of oxidation, fixed both inside the zeolite cavities and on their outer side.