Promotion effects of alkali metals on iron molybdate catalysts for CO₂ catalytic hydrogenation

Promotion effects of alkali metals on iron molybdate catalysts for CO₂ catalytic hydrogenation

Zhou, Yong (Université de Lille; University of Artois)
Sadia Traore, Aliou (University of Strasbourg)
Peron, Deizi V. (Université de Lille; University of Artois)
Barrios, Alan J. (Université de Lille; University of Artois)
Chernyak, Sergei A. (Université de Lille; University of Artois)
Corda, Massimo (Université de Lille)
Safonova, Olga V. (Paul Scherrer Institut)
Dugulan, A.I. (TU Delft RST/Fundamental Aspects of Materials and Energy; TU Delft RID/TS/Instrumenten groep)
Ersen, Ovidiu (University of Strasbourg)

2023

CO₂ hydrogenation is an attractive way to store and utilize carbon dioxide generated by industrial processes, as well as to produce valuable chemicals from renewable and abundant resources. Iron catalysts are commonly used for the hydrogenation of carbon oxides to hydrocarbons. Iron-molybdenum catalysts have found numerous applications in catalysis, but have been never evaluated in the CO₂ hydrogenation. In this work, the structural properties of iron-molybdenum catalysts without and with a promoting alkali metal (Li, Na, K, Rb, or Cs) were characterized using X-ray diffraction, hydrogen temperature-programmed reduction, CO₂ temperature-programmed desorption, in-situ ⁵⁷Fe Mossbauer spectroscopy and operando X-ray adsorption spectroscopy. Their catalytic performance was evaluated in the CO₂ hydrogenation. During the reaction conditions, the catalysts undergo the formation of an iron (II) molybdate structure, accompanied by a partial reduction of molybdenum and carbidization of iron. The rate of CO₂ conversion and product selectivity strongly depend on the promoting alkali metals, and electronegativity was identified as an important factor affecting the catalytic performance. Higher CO₂ conversion rates were observed with the promoters having higher electronegativity, while low electronegativity of alkali metals favors higher light olefin selectivity.

Alkali metals
CO utilization
In-situ characterization
Iron molybdate catalysts
Light olefins
Promotion

http://resolver.tudelft.nl/uuid:50edb126-c29a-4fe7-9f71-1464f97d40a3

https://doi.org/10.1016/j.jechem.2023.06.019

2024-01-01

2095-4956

Journal of Energy Chemistry, 85, 291-300

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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journal article

© 2023 Yong Zhou, Aliou Sadia Traore, Deizi V. Peron, Alan J. Barrios, Sergei A. Chernyak, Massimo Corda, Olga V. Safonova, A.I. Dugulan, Ovidiu Ersen, More Authors