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Volume 197, 2017
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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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Article information


Submitted
15 Sep 2016
Accepted
24 Oct 2016
First published
24 Oct 2016

Faraday Discuss., 2017,197, 101-116
Article type
Paper

Understanding FTS selectivity: the crucial role of surface hydrogen

C. J. Weststrate and J. W. Niemantsverdriet, Faraday Discuss., 2017, 197, 101
DOI: 10.1039/C6FD00191B

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