Stability of Fischer-Tropsch catalysts studied in-situ

Chemical Engineering Graduate Seminar



The Fischer-Tropsch synthesis offers a route of converting a mixture of hydrogen and carbon monoxide (syngas) to synthetic fuels and chemicals. Historically, and presently at industrial scale, syngas is produced from fossil sources such as coal and natural gas, but it can alternatively be derived from water (green hydrogen) and hard-to-abate or atmospheric CO2 as well as from biogenic and waste sources. The process therefore holds promise to serve as a key technology to produce sustainable fuels and chemicals for the future.

Like any other catalytic reaction though, the cobalt- and iron-based Fischer-Tropsch CO hydrogenation is plagued by a number of deactivation processes. Oxidation and sintering are two of the main ones and these have been studied at reaction conditions using an unique in-situ magnetometer and a number of industrial and model catalysts with well-defined crystallite sizes. The roles of catalyst design parameters and reaction conditions on these deactivation pathways could be clearly identified and will be discussed in this presentation.



Professor Claeys obtained his PhD (with distinction) in Fischer-Tropsch catalysis at the University of Karlsruhe, Germany, in 1997 and then joined the Catalysis Institute at the University of Cape Town. Here he was instrumental in establishing a large research activity with focus on Fischer-Tropsch catalysis, a technology, which lies at the heart of South Africa’s synthetic fuels and chemicals industry and which is playing an increasingly important role in the production of green future fuels via Power-to-X processes. Other research interests include the preparation and characterisation of nano materials and their use in catalytic applications, as well as the development of catalysts and novel instrumentation for characterisation of catalysts at working conditions. Professor Claeys has published extensively on these topics, he holds a number of patents and he has been awarded an A-rating (‘leading international researcher’) by the National Research Foundation of South Africa. 

A large portion of his research is conducted in conjunction with industrial partners, in particular a longstanding industrial collaboration with Sasol R&D. Professor Claeys is the Director of the DSI-NRF Centre of Excellence in Catalysis, c*change, a large virtual and multidisciplinary Centre, where he also acts as the Manager of the Scientific Synthesis Gas Programme, which includes processes of catalytic valorization of CO2. He is currently involved in various large PTL projects including the BMBF-funded CARE-O-SENE consortium and the South African national CoalCO2-to-X flagship programme. Moreover, he is the founding Chairperson of the Syngas Convention, a triennial international meeting on synthesis gas technologies held in Cape Town.


Professor Michael Claeys

Professor, Catalysis Institute & DSI-NRF Centre of Excellence in Catalysis (c*change), University of Cape Town

Event Quick Information

28 Nov, 2023
11:45 AM - 12:45 PM
KAUST, Bldg. 9, Level 2, Lecture Hall 1