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Hard X‐ray Nanotomography for 3D Analysis of Coking in Nickel‐based Catalysts

Weber, Sebastian ORCID iD icon 1,2; Batey, Darren; Cipiccia, Silvia; Stehle, Matthias 2; Abel, Ken L.; Gläser, Roger; Sheppard, Thomas Lennon 1,2
1 Institut für Katalyseforschung und -technologie (IKFT), Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)


Understanding catalyst deactivation by coking is crucial for knowledge-based catalyst and process design in reactions with carbonaceous species. Post-mortem analysis of catalyst coking is often performed by bulk characterization methods. Here, hard X-ray ptychographic computed tomography (PXCT) was used to study Ni/Al$_{2}$O$_{3}$ catalysts for CO$_{2}$ methanation and CH$_{4}$ dry reforming after artificial coking treatment. PXCT generated quantitative 3D maps of local electron density at ca. 80 nm resolution, allowing to visualize and evaluate the severity of coking in entire catalyst particles of ca. 40 μm diameter. Coking was primarily revealed in the nanoporous solid, which was not detectable in resolved macropores. Coke formation was independently confirmed by operando Raman spectroscopy. PXCT is highlighted as an emerging characterization tool for nanoscale identification, co-localization, and potentially quantification of deactivation phenomena in 3D space within entire catalyst particles.

Verlagsausgabe §
DOI: 10.5445/IR/1000136092
Veröffentlicht am 27.03.2022
DOI: 10.1002/anie.202106380
Zitationen: 4
Web of Science
Zitationen: 4
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 27.09.2021
Sprache Englisch
Identifikator ISSN: 1433-7851, 1521-3773
KITopen-ID: 1000136092
HGF-Programm 38.03.02 (POF IV, LK 01) Power-based Fuels and Chemicals
Erschienen in Angewandte Chemie / International edition
Verlag John Wiley and Sons
Band 60
Heft 40
Seiten 21772-21777
Projektinformation SPP 2080; DYNAMIK-CO2 (DFG, DFG KOORD, SH 1281/1-1)
Bemerkung zur Veröffentlichung Artikel auch erschienen in: Science Forum Chemistry 2021 (WiFo 2021)
Vorab online veröffentlicht am 02.08.2021
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