Catalysis and NAFUMA researchers team up and use X-rays to reveal the inner workings of a catalyst material

Heterogeneous catalysis is a key enabling technology for the transition from a fossil-based society to a renewables-based scenario. Industrial catalysts are always shaped into millimeter-sized catalyst objects suitable for large scale industrial use. However, these catalysts invariably suffer from a loss of performance due to carbon deposits. It is vital to understand how these phenomena occur in these shaped objects, resolved both in time and space.

Journal of Catalysis, Volume 401, 1-6.

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Panel a) shows fresh (white) and deactivated (black) catalyst extrudates. Panel b) is a heat map show the extent of carbon deposition as inferred from X-ray diffraction. Clearly, the catalyst is deactivated from the outside and inwards, and the innermost section (pale yellow) has not taken part in the chemical reaction at all.

By Stian Svelle
Published Mar. 10, 2023

Time in this context means the time of use in an industrial process, whereas space means spatial resolution across shaped catalyst objects. This requires utilization of national and international research infrastructures. We have performed computed tomography X-ray diffraction at the European Synchrotron in Grenoble to reveal that the deactivation progresses gradually from the outside of the extrudate and inwards. Moreover, a substantial fraction of the inner volume of the catalyst is not utilized, thus providing a pathway for technological improvements.

Read the article here.


Wragg, D. S., Kalantzopoulos, G. N., Pappas, D. K., Pinilla-Herrero, I., Rojo-Gama, D., Redekop, E., Di Michiel, M., Beato, P., Lundegaard, L. F. & Svelle, S. (2021). Mapping the coke formation within a zeolite catalyst extrudate in space and time by operando computed X-ray diffraction tomography. Journal of Catalysis, Volume 401, 1-6. https://doi.org/10.1016/j.jcat.2021.07.001.

Published Mar. 10, 2023 3:24 PM - Last modified Apr. 29, 2026 12:33 PM