Asatov, S.N., Ashurov, Kh.Kh., & Ulugov, G.D.
Features of the conditions for the reduction of molybdenum trioxide with hydrogen. |
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Full Article: PDF
Scientific Object Identifier: http://s-o-i.org/1.1/TAS-12-152-17
DOI: https://dx.doi.org/10.15863/TAS.2025.12.152.17
Language: English
Citation: Asatov, S.N., Ashurov, Kh.Kh., & Ulugov, G.D. (2025). Features of the conditions for the reduction of molybdenum trioxide with hydrogen. ISJ Theoretical & Applied Science, 12 (152), 101-105. Soi: https://s-o-i.org/1.1/TAS-12-152-17 Doi: https://dx.doi.org/10.15863/TAS.2025.12.152.17 |
Pages: 101-105
Published: 30.12.2025
Abstract: The reduction of molybdenum trioxide (MoO?) to metallic molybdenum is a critical technological stage in the production of high-purity molybdenum and its alloys, widely used in mechanical engineering, metallurgy, and high-temperature applications. This study investigates the fundamental features of the conditions governing the reduction of molybdenum trioxide using hydrogen as a reducing agent. Particular attention is paid to the thermodynamic feasibility, reaction mechanisms, and kinetic regularities of the hydrogen reduction process under controlled temperature and gas-phase conditions. The work analyzes existing reduction methods employing various reducing agents and provides a comparative assessment emphasizing the advantages of hydrogen in terms of selectivity, environmental compatibility, and product purity. The chemical transformations occurring during the stepwise reduction of MoO? to intermediate oxides (MoO?) and subsequently to metallic molybdenum are examined from the standpoint of atomistic and molecular interactions between solid oxide phases and gaseous hydrogen. The influence of temperature, hydrogen flow rate, particle size, and phase composition on reaction kinetics is systematically evaluated. Kinetic studies reveal that the reduction process is governed by both chemical reaction control and diffusion limitations, depending on the operating conditions. Recovery curves obtained experimentally illustrate the characteristic stages of oxide transformation and highlight the critical temperature ranges in which phase transitions and rate changes occur. The role of hydrogen dissociation, gas–solid interface reactions, and the formation of porous structures in the reduced product are discussed in detail. The results contribute to a deeper understanding of the physicochemical principles underlying hydrogen reduction of molybdenum trioxide and provide a scientific basis for optimizing industrial reduction regimes. The findings can be applied to improve energy efficiency, enhance reduction completeness, and ensure consistent quality of molybdenum powders produced for advanced engineering applications.
Key words: Anchor, rock mass, stress, tensile force, reinforcing structure, elastic and dynamic force, static force, failure.
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