TY - JOUR AU - Ismagilov, I.Z. AU - Vosmerikov, A.V. AU - Korobitsyna, L.L. AU - Matus, E.V. AU - Kerzhentsev, M.A. AU - Stepanov, A.A. AU - Mihaylova, E.S. AU - Ismagilov, Z.R. PY - 2021/11/10 Y2 - 2024/03/29 TI - Promoters for Improvement of the Catalyst Performance in Methane Valorization Processes JF - Eurasian Chemico-Technological Journal JA - Eurasian Chem.-Technol. J. VL - 23 IS - 3 SE - Articles DO - 10.18321/ectj1099 UR - https://ect-journal.kz/index.php/ectj/article/view/1099 SP - 147-168 AB - <p><em>This paper is devoted to the celebration&nbsp;of 75 years’ jubilee of Professor Zulkhair Mansurov</em></p><p>In this work, the introduction of modifying additives in the composition of catalysts is considered as an effective mode of improving functional characteristics of materials for two processes of methane conversion into valuable products – methane dehydroaromatization (DHA of CH<sub>4</sub>) into benzene and hydrogen and autothermal reforming of methane (ATR of CH<sub>4</sub>) into synthesis gas. The effect of type and content of promoters on the structural and electronic state of the active component as well as catalyst activity and stability against deactivation is discussed. For DHA of CH<sub>4</sub> the operation mode of additives M = Ag, Ni, Fe in the composition of Mo-M/ZSM-5 catalysts was elucidated and correlated with the product yield and coke content. It was shown that when Ag serves as a promoter, the duration of the catalyst stable operation is enhanced due to a decrease in the rate of the coke formation. In the case of Ni and Fe additives, the Ni-Мо and Fe-Mo alloys are formed that retain the catalytic activity for a long time in spite of the carbon accumulation. For ATR of CH<sub>4</sub>, the influence of M = Pd, Pt, Re, Mo, Sn in the composition of Ni-M catalysts supported on La<sub>2</sub>O<sub>3</sub> or Ce<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> was elucidated. It was demonstrated that for Ni-M/La<sub>2</sub>O<sub>3</sub> catalysts, Pd is a more efficient promoter that improves the reducibility of Ni cations and increases the content of active Nio centers. In the case of Ni-M/Ce<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> samples, Re is considered the best promoter due to the formation of an alloy with anti-coking and anti-sintering properties. The use of catalysts with optimal promoter type and its content provides high efficiency of methane valorization processes.</p> ER -