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Molecules 2017, 22(9), 1579; doi:10.3390/molecules22091579

The Effect of Copper Addition on the Activity and Stability of Iron-Based CO2 Hydrogenation Catalysts

1
ASEE Postdoctoral Research Associate, Naval Research Laboratory, Materials Science and Technology Division, Washington, DC 20375, USA
2
Naval Research Laboratory, Chemistry Division, Washington, DC 20375, USA
3
Naval Research Laboratory, Materials Science and Technology Division, Washington, DC 20375, USA
4
Naval Research Laboratory, Acoustics Division, Washington, DC 20375, USA
5
NOVA Research Inc., 1900 Elkin Street, Alexandria, VA 22308, USA
*
Author to whom correspondence should be addressed.
Received: 4 August 2017 / Accepted: 13 September 2017 / Published: 20 September 2017
(This article belongs to the Special Issue Hydrofunctionalization and Hydrogenation with Earth Abundant Metals)
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Abstract

Iron-based CO2 catalysts have shown promise as a viable route to the production of olefins from CO2 and H2 gas. However, these catalysts can suffer from low conversion and high methane selectivity, as well as being particularly vulnerable to water produced during the reaction. In an effort to improve both the activity and durability of iron-based catalysts on an alumina support, copper (10–30%) has been added to the catalyst matrix. In this paper, the effects of copper addition on the catalyst activity and morphology are examined. The addition of 10% copper significantly increases the CO2 conversion, and decreases methane and carbon monoxide selectivity, without significantly altering the crystallinity and structure of the catalyst itself. The FeCu/K catalysts form an inverse spinel crystal phase that is independent of copper content and a metallic phase that increases in abundance with copper loading (>10% Cu). At higher loadings, copper separates from the iron oxide phase and produces metallic copper as shown by SEM-EDS. An addition of copper appears to increase the rate of the Fischer–Tropsch reaction step, as shown by modeling of the chemical kinetics and the inter- and intra-particle transport of mass and energy. View Full-Text
Keywords: CO2 conversion; selectivity; activity; modelling; iron-based; copper CO2 conversion; selectivity; activity; modelling; iron-based; copper
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bradley, M.J.; Ananth, R.; Willauer, H.D.; Baldwin, J.W.; Hardy, D.R.; Williams, F.W. The Effect of Copper Addition on the Activity and Stability of Iron-Based CO2 Hydrogenation Catalysts. Molecules 2017, 22, 1579.

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