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Improving Fe/Al2O3 catalysts for the Reverse Water-Gas Shift reaction: on the effect of Cs as activity/selectivity promoter

Pastor-Perez, Laura, Shah, Mihir, Le Saché, Estelle and Ramirez Reina, Tomas (2018) Improving Fe/Al2O3 catalysts for the Reverse Water-Gas Shift reaction: on the effect of Cs as activity/selectivity promoter Catalysts.

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Abstract

Abstract: The conversion of CO2 into CO via the Reverse Water-Gas Shift (RWGS) reaction is a suitable route for CO2 valorisation. Fe-based catalysts are highly active for this reaction but their activity and selectivity can be substantially boosted by adding Cs as a promoter. In this work we demonstrate that Cs modifies the redox behaviour and the surface chemistry of the iron based materials. The metallic dispersion and the amount of metallic Fe centres available for the reaction depends on Cs loading. 5 wt.% of Cs is an optimum amount of dopant to achieve a fair activity/selective balance. Nevertheless, depending on the RWGS reactor operational temperature, lower concentrations of Cs also lead to acceptable catalytic performance. Along with the excellent activity of the prepared materials this work showcases their robustness for long-term runs and the strong impact of H2/CO ratio in the overall catalytic performance.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Pastor-Perez, Laural.pastorperez@surrey.ac.uk
Shah, Mihir
Le Saché, Estellee.lesache@surrey.ac.uk
Ramirez Reina, Tomast.ramirezreina@surrey.ac.uk
Date : 2018
Funders : University of Surrey, Engineering and Physical Sciences Research Council (EPSRC)
Copyright Disclaimer : © 2018 by the authors. Submitted for possible open access publication under the terms and 476 conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords : RWGS; Fe catalysts; Caesium promoter; CO2 conversion
Related URLs :
Depositing User : Clive Harris
Date Deposited : 27 Nov 2018 14:58
Last Modified : 11 Dec 2018 11:24
URI: http://epubs.surrey.ac.uk/id/eprint/849942

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