Jump to main content
Jump to site search
SCHEDULED MAINTENANCE Close the message box

Maintenance work is planned for Monday 16 August 2021 from 07:00 to 23:59 (BST).

Website performance may be temporarily affected and you may not be able to access some PDFs or images. If this does happen, refreshing your web browser should resolve the issue. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 5, 2017

Insights into the influence of support and potassium or sulfur promoter on iron-based Fischer–Tropsch synthesis: understanding the control of catalytic activity, selectivity to lower olefins, and catalyst deactivation

Author affiliations

Abstract

The fundamental understanding of the control of catalytic activity, selectivity and deactivation in iron-based FTS is of prime scientific and industrial importance. In this work, the inter-effects of various supports and promoters (K, Na and S) in FTS have been studied intensively to elucidate and draw the key points of a better reaction performance. Logical results from abundant experimental work indicate that the catalytic activity is mainly affected by the reducibility of iron oxides which is related to the particle size, interaction with the support, and promoter characteristics, and by the particle size-dependent carburization. In order to reach a desired selectivity to lower olefins (C2=–C4=) beyond the limitation of the Schulz–Flory distribution, the use of K or Na alone is insufficient due to its favorable chain growth to form higher hydrocarbons. It is well confirmed that S can shift the selectivity toward short-chain C2–C4 hydrocarbons without an increased selectivity to methane. Combining this distinctive function of S with the favoring of β-hydride abstraction termination of K and a suitable support to have a weak interaction with iron particles, a substantially higher selectivity to lower olefins at about 45–55% with 10–15% methane and ∼6% C2–C4 paraffins could be obtained at a milder reaction temperature and elevated reaction pressure (300 °C, 1.0 MPa). In this study, the catalyst deactivation is mainly ascribed to K-induced carbon deposition while the reversible transformation of χ-Fe5C2 into Fe3O4 is another reason to some extent.

Graphical abstract: Insights into the influence of support and potassium or sulfur promoter on iron-based Fischer–Tropsch synthesis: understanding the control of catalytic activity, selectivity to lower olefins, and catalyst deactivation

Supplementary files

Article information


Submitted
09 Jan 2017
Accepted
02 Feb 2017
First published
24 Feb 2017

Catal. Sci. Technol., 2017,7, 1245-1265
Article type
Paper

Insights into the influence of support and potassium or sulfur promoter on iron-based Fischer–Tropsch synthesis: understanding the control of catalytic activity, selectivity to lower olefins, and catalyst deactivation

F. Jiang, M. Zhang, B. Liu, Y. Xu and X. Liu, Catal. Sci. Technol., 2017, 7, 1245 DOI: 10.1039/C7CY00048K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements