Hard X-Ray Nanotomography for 3D Analysis of Coking in Nickel-Based Catalysts.

Autor: Weber S; Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 20, 76131, Karlsruhe, Germany.; Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany., Batey D; Diamond Light Source, Harwell Science and Innovation Campus, Fermi Ave, Didcot, OX11 0DE, UK., Cipiccia S; Dept. of Medical Physics & Biomedical Engineering, University College London, Malet Place, Gower Street, London, WC1E 6BT, UK., Stehle M; Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 20, 76131, Karlsruhe, Germany., Abel KL; Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103, Leipzig, Germany., Gläser R; Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103, Leipzig, Germany., Sheppard TL; Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 20, 76131, Karlsruhe, Germany.; Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2021 Sep 27; Vol. 60 (40), pp. 21772-21777. Date of Electronic Publication: 2021 Aug 31.
DOI: 10.1002/anie.202106380
Abstrakt: 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.
(© 2021 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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