Weber, Sebastian;
Batey, Darren;
Cipiccia, Silvia;
Stehle, Matthias;
Abel, Ken L;
Glaeser, Roger;
Sheppard, Thomas L;
(2021)
Hard X-Ray Nanotomography for 3D Analysis of Coking in Nickel-Based Catalysts.
Angewandte Chemie International Edition
, 60
(40)
pp. 21772-21777.
10.1002/anie.202106380.
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Abstract
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/Al2O3 catalysts for CO2 methanation and CH4 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.
| Type: | Article |
|---|---|
| Title: | Hard X-Ray Nanotomography for 3D Analysis of Coking in Nickel-Based Catalysts |
| Location: | Germany |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/anie.202106380 |
| Publisher version: | https://doi.org/10.1002/anie.202106380 |
| Language: | English |
| Additional information: | © 2021 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | carbon, methanation of CO_{2}, nickel, Raman spectroscopy, X-ray ptychography |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10146820 |
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