PHYSICOCHEMICAL AND CATALYTIC PROPERTIES OF NiMo-CONTAINING ALUMINA-OXIDE CATALYTIC SYSTEMS

The properties of NiMo-alumina catalytic systems for hydrocarbon feedstock hydrotreating processes have been obtained and studied. The originality of this work is due to two factors: first, a delta modification of aluminum oxide was chosen as a carrier for the system and second, polyoxometallate molybdenum compounds derived from molybdenum disulfide were used in the preparation of the active molybdenum component. Nickel acts as the promoting metal. The physical and chemical properties of the obtained samples were investigated by X-ray phase analysis, high-resolution transmission electron microscopy with trace element analysis of the surface and textural properties by the low-temperature nitrogen adsorption method. The obtained applied catalytic system was compared with alumina carrier. The results of X-ray phase analysis with electron microscopy confirm the deposition of the active component on the surface of aluminum oxide. Based on the results obtained, it is concluded that further optimization of the calcination conditions is necessary. The obtained results on textural properties show that the specific surface area of delta modification of aluminum oxide using additional components does not meet the technological requirements. The study of catalytic properties of the obtained systems on model raw materials (dibenzothiophene in decane with the content of 1000 ppm in recalculation of atomic sulfur), shows a significant desulfurizing activity of the bimetallic system. As a result, it was possible to reduce the sulfur content from 1000 ppm to 94 ppm, i.e. by 90.4% compared to the original model feedstock. It was also revealed by the results of chromatography-mass spectrometry that the process of hydrodesulfurization of model feedstock proceeds by the route of direct desulfurization. For citation: Akimov Al.S., Petrenko T.V., Gerasimov E.Yu., Akimov A.S. Physicochemical and catalytic properties of NiMo-containing alumina-oxide catalytic systems. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 8. P. 32-40. DOI: 10.6060/ivkkt.20256808.1t.