Identifying Performance Descriptors in CO 2 Hydrogenation over Iron-Based Catalysts Promoted with Alkali Metals.

Autor: Yang Q; Leibniz-Institut für Katalyse e. V., Albert-Einstein-Str. 29a, 18059, Rostock, Germany., Kondratenko VA; Leibniz-Institut für Katalyse e. V., Albert-Einstein-Str. 29a, 18059, Rostock, Germany., Petrov SA; Institute of Solid-State Chemistry and Mechanochemistry, Kutateladze Str. 18, 630128, Novosibirsk, Russia., Doronkin DE; Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, Herrmann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany., Saraçi E; Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, Herrmann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany., Lund H; Leibniz-Institut für Katalyse e. V., Albert-Einstein-Str. 29a, 18059, Rostock, Germany., Arinchtein A; Department of Chemistry, Technische Universität Berlin, Strasse des 17. Juni 124, 10623, Berlin, Germany., Kraehnert R; Department of Chemistry, Technische Universität Berlin, Strasse des 17. Juni 124, 10623, Berlin, Germany., Skrypnik AS; Leibniz-Institut für Katalyse e. V., Albert-Einstein-Str. 29a, 18059, Rostock, Germany.; Institute of Solid-State Chemistry and Mechanochemistry, Kutateladze Str. 18, 630128, Novosibirsk, Russia.; Novosibirsk State University, Pirogova Str. 1, 630090, Novosibirsk, Russia., Matvienko AA; Institute of Solid-State Chemistry and Mechanochemistry, Kutateladze Str. 18, 630128, Novosibirsk, Russia.; Novosibirsk State University, Pirogova Str. 1, 630090, Novosibirsk, Russia., Kondratenko EV; Leibniz-Institut für Katalyse e. V., Albert-Einstein-Str. 29a, 18059, Rostock, Germany.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2022 May 23; Vol. 61 (22), pp. e202116517. Date of Electronic Publication: 2022 Mar 31.
DOI: 10.1002/anie.202116517
Abstrakt: Alkali metal promoters have been widely employed for preparation of heterogeneous catalysts used in many industrially important reactions. However, the fundamentals of their effects are usually difficult to access. Herein, we unravel mechanistic and kinetic aspects of the role of alkali metals in CO 2 hydrogenation over Fe-based catalysts through state-of-the-art characterization techniques, spatially resolved steady-state and transient kinetic analyses. The promoters affect electronic properties of iron in iron carbides. These carbide characteristics determine catalyst ability to activate H 2 , CO and CO 2 . The Allen scale electronegativity of alkali metal promoter was successfully correlated with the rates of CO 2 hydrogenation to higher hydrocarbons and CH 4 as well as with the rate constants of individual steps of CO or CO 2 activation. The derived knowledge can be valuable for designing and preparing catalysts applied in other reactions where such promoters are also used.
(© 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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