An investigation of iron-based Fischer-Tropsch catalysts using inelastic neutron scattering

Warringham, Robbie (2015) An investigation of iron-based Fischer-Tropsch catalysts using inelastic neutron scattering. PhD thesis, University of Glasgow.

Due to Embargo and/or Third Party Copyright restrictions, this thesis is not available in this service.

Abstract

The primary objective of this study was to characterise standard iron based Fischer-
Tropsch catalysts by using the hydrogenation of CO at elevated temperatures and ambient
pressure as a test reaction. The reaction test data is supplemented by the following analytical
techniques; X-ray diffraction (XRD), Raman scattering, temperature programmed
oxidation (TPO), transmission electron microscopy (TEM) and also inelastic neutron scattering
(INS). The aim of these studies is to characterise the hydrocarbonaceous species
present on the catalyst surface after reaction and to propose what role these hydrocarbonaceous
species may play in the Fe/CO/H2 surface chemistry; be it active or not. These
initial characterisation studies of the reacted iron catalysts were then extended to study
the temporal dependence of these species with increasing reaction time. The application
of inelastic neutron scattering is shown to provide a great deal of information regarding
the hydrocarbonaceous component present in these types of systems. Therefore the application
of INS and the subsequent result constitute the majority of the discussion of
this study. The research objectives for this study can be listed as follows;
1. To prepare an iron oxide catalyst using a reproducible and controlled method and
to characterise this material using the methods outlined previously.
2. To react the iron oxide catalysts using a representative test reaction for the purpose
of characterising the surface species present after reaction.
3. To use inelastic neutron scattering to probe and gain a vibrational spectroscopic
insight to the hydrocarbonaceous species present.
4. To study the temporal dependence of the hydrocarbonaceous species and how they
alter with increasing time-on-stream.
The thesis will begin with an introduction to Fischer-Tropsch catalysis, with a focus
on iron-based Fischer-Tropsch catalysis. The discussion will move to some heightened
analysis of some previously reported INS measurements of iron Fischer-Tropsch catalysts.
This prelude will be followed by the main discussion of results, that is the characterisation
of the reacted iron oxide catalyst using inelastic neutron scattering and the temporal study
with increasing time-on-stream. The thesis will then finish with a discussion on a brief
study investigating the role of promoters in iron based Fischer-Tropsch catalysts, which
constitutes future work.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Subjects: Q Science > QD Chemistry
Colleges/Schools: College of Science and Engineering > School of Chemistry
Supervisor's Name: Lennon, Dr. David
Date of Award: 2015
Embargo Date: 19 May 2020
Depositing User: Mr Robbie Warringham
Unique ID: glathesis:2015-6364
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 19 May 2015 15:53
Last Modified: 25 May 2015 11:46
URI: http://theses.gla.ac.uk/id/eprint/6364

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