Sie können Bookmarks mittels Listen verwalten, loggen Sie sich dafür bitte in Ihr SLUB Benutzerkonto ein.
Medientyp:
E-Artikel
Titel:
Hard X‐Ray Nanotomography for 3D Analysis of Coking in Nickel‐Based Catalysts
Beteiligte:
Weber, Sebastian;
Batey, Darren;
Cipiccia, Silvia;
Stehle, Matthias;
Abel, Ken L.;
Gläser, Roger;
Sheppard, Thomas L.
Erschienen:
Wiley, 2021
Erschienen in:Angewandte Chemie International Edition
Sprache:
Englisch
DOI:
10.1002/anie.202106380
ISSN:
1433-7851;
1521-3773
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>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<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> catalysts for CO<jats:sub>2</jats:sub> methanation and CH<jats:sub>4</jats:sub> 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 <jats:italic>operando</jats:italic> 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.</jats:p>