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Understanding FTS selectivity: the crucial role of surface hydrogen

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Abstract

Monomeric forms of carbon play a central role in the synthesis of long chain hydrocarbons via the Fischer–Tropsch synthesis (FTS). We explored the chemistry of C1Hxad species on the close-packed surface of cobalt. Our findings on this simple model catalyst highlight the important role of surface hydrogen and vacant sites for product selectivity. We furthermore find that COad affects hydrogen in multiple ways. It limits the adsorption capacity for Had, lowers its adsorption energy and inhibits dissociative H2 adsorption. We discuss how these findings, extrapolated to pressures and temperatures used in applied FTS, can provide insights into the correlation between partial pressure of reactants and product selectivity. By combining the C1Hx stability differences found in the present work with literature reports of the reactivity of C1Hx species measured by steady state isotope transient kinetic analysis, we aim to shed light on the nature of the atomic carbon reservoir found in these studies.

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Publication details

The article was received on 15 Sep 2016, accepted on 24 Oct 2016, published on 24 Oct 2016 and first published online on 24 Oct 2016


Article type: Paper
DOI: 10.1039/C6FD00191B
Citation: Faraday Discuss., 2017, Advance Article
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    Understanding FTS selectivity: the crucial role of surface hydrogen

    C. J. Weststrate and J. W. Niemantsverdriet, Faraday Discuss., 2017, Advance Article , DOI: 10.1039/C6FD00191B

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